Temporal vs Restate

Temporal fits teams that want an MIT-licensed server with a mature, separately operated persistence layer. Restate fits teams that want a lighter runtime with serverless suspension, provided its Business Source License terms suit their use.

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Temporal vs Restate: which runtime fits your team

Choose Temporal when you want an MIT-licensed server you can run as a mature self-hosted cluster and when your platform team is ready to operate several services. The Temporal Service splits into Frontend, History, Matching and Worker services, backed by a persistence store for workflow state and a separate visibility store for search. That split gives you fine control over scaling and storage, and it means you own more moving parts. Choose Restate when you want a smaller operational footprint, a server distributed as a single binary family, and suspension of waiting code for serverless deployments. Restate is licensed under the Business Source License 1.1, which permits production use for invoking your own services and internal platforms, but it excludes running a Public Restate Platform Service for third parties.

The decision turns on three questions. First, licensing scope: if your business model involves offering a managed runtime to outside customers, the Restate license restriction matters and your counsel should read the additional use grant in full, while Temporal's MIT terms carry no such field-of-use limit. Second, operating a multi-service cluster: confirm whether your team can run Temporal's services and a supported database, and whether Restate's highly available cluster design with partition and log replication fits your recovery targets. Third, language SDKs: list the languages your teams write in today, then check each runtime's SDK coverage against that list. Restate publishes SDKs for TypeScript, Java and Kotlin, Python, Go and Rust, so verify your exact versions and features with each project before committing.

Which platform fits which team scenario

This table maps common team situations to the platform that fits them better, based on licensing, deployment model and operating load. Read each row for the condition that makes the named platform the stronger choice, then check the licensing and clustering details elsewhere on this page before deciding.

ScenarioBetter fitWhy
Own services in own cloud, no third-party managed serviceTemporalTemporal Server is MIT licensed with no use restriction on self-hosting. Choose it if you will run the cluster yourself and want the most conventional open-source license for internal platforms.
Serverless functions that must pause while waitingRestateRestate's core primitives include suspension of waiting code for serverless deployments. Pick it when idle waits should not keep compute running, and confirm the exact serverless targets you need in Restate's documentation.
Vendor planning to offer Restate-based services to third partiesTemporalRestate's Business Source License excludes running a Public Restate Platform Service, where third parties register and invoke their own services. Have counsel review the license terms against your business model before choosing Restate, and consider Temporal's MIT terms if third-party hosting is planned.
Long-running business workflows across many languagesTemporalTemporal offers SDKs for Go, Java, TypeScript and Python, with a complete ordered event history for replay. Restate also offers several SDKs, so confirm that your specific languages and libraries are supported in both before deciding.
Team with no Kubernetes or database operations capacityNeither as self-hosted by defaultTemporal self-hosting needs Frontend, History, Matching and Worker services plus a persistence store and visibility store, and Restate self-hosting needs a highly available cluster with replication. Compare a managed option such as Temporal Cloud or Restate Cloud, and ask each vendor for a written operating model before committing.
Team that needs Restate's UI and CLI with OpenTelemetry traces as a starting pointRestateRestate's README lists a UI and CLI with OpenTelemetry traces among its core features. Choose it if built-in tracing from the runtime matters more to you than the broader community tooling around Temporal.
Team that needs a standard ecosystem with broad community toolingTemporalTemporal has the longer public track record for self-hosted clusters and documented security controls such as mTLS, a ClaimMapper and an Authorizer plugin. Confirm that Restate's security and access controls meet your requirements before choosing it.

How each runtime is built and what that means for operations

Temporal and Restate both ask the operator to run a server tier, a storage tier and a way to reach it from applications, but the number of moving parts and the failure domains differ. The cards below set out what each runtime asks you to run, deploy and monitor before you commit to one.

Temporal's four services and storage

A self-hosted Temporal Service runs Frontend, History, Matching and Worker services on top of a persistence store. The tested persistence options are Cassandra, PostgreSQL and MySQL, and SQLite is for development only. Choosing the database sets your backup, upgrade and on-call routine, so confirm which engine and version your platform team already operates well. Monitor each service separately, because a slow History service and a saturated database look alike from the application side.

Temporal deployment routes

Temporal can be run with Docker Compose, Go binaries, Helm charts that place each server service in its own Kubernetes pods, or a custom Go build that imports the server package. Helm chart versions below 0.73.1 do not work with server images 1.30 and later, so pin the chart version alongside the server image. A custom Go build gives you control over the binary but moves patching and rebuilds onto your team. Ask which route your platform team will support in production before you pick a tutorial path.

Temporal visibility store

Visibility is a separate store that answers list and search queries over workflow executions, and it is distinct from the persistence store that holds execution history. Temporal recommends Elasticsearch or OpenSearch for anything beyond a few workflow executions, so a small pilot on SQL visibility can hide a later migration. Plan for a second data system to back up, index and upgrade. Confirm the visibility backend and its version before you size the cluster.

Restate server and install paths

Restate ships a single server and CLI as pre-built binaries for macOS and Linux, and it can also be installed with Homebrew, npx or Docker. The server is the component that holds durable state, timers and invocation logs for your services, so it becomes the thing you back up and upgrade. This is a smaller initial footprint than a multi-service Temporal cluster, but you still need to decide where the server runs, how it is patched and how its state is retained. Confirm the supported Linux distributions and the Docker image tags you will pin in your environment.

Restate highly available clusters

Restate's documentation describes highly available self-hosted clusters that replicate partitions and logs across nodes. This is the part that determines how much of your operational effort goes into quorum, node placement and failover testing. Replication protects availability, but it also means you must rehearse node loss and rejoin before production, not after an incident. Ask Restate for the current cluster sizing guidance and the procedure for replacing a failed node.

Restate Cloud, BYOC and self-hosted

Restate offers three operating models: Restate Cloud, Restate BYOC and self-hosted Restate. Choosing between them changes who runs the control plane, who holds the state and who is paged when the cluster degrades. For a regulated team, the decision often turns on where data must reside and which party must evidence controls. Map each option against your data residency rules and your on-call ownership before comparing feature lists.

Capability, license and deployment differences side by side

This table sets Temporal's MIT-licensed server against Restate's Business Source License server across licensing, SDKs, state handling, self-hosting and authorization defaults. Read each row as a question to put to both vendors, since a blank or conditional cell means the research did not settle it and you should confirm it before deciding.

CapabilityTemporalRestate
LicenseTemporal Server is MIT licensedRestate is licensed under the Business Source License 1.1, changing to Apache 2.0 four years after each release
License limits on production useMIT terms place no usage restriction on the server itself; confirm any terms that apply to Temporal Cloud separatelyProduction use invoking your own services and internal managed platforms is permitted; running a Public Restate Platform Service is not
Server language and install optionsDocker Compose, Go binaries, Helm charts on Kubernetes, or importing the server package into a custom Go buildPre-built server and CLI binaries for macOS and Linux, Homebrew, npx or Docker; confirm other install paths with Restate
SDK languagesGo, Java, TypeScript and PythonTypeScript, Java and Kotlin, Python, Go and Rust
Durable execution and replay modelWorkflows written as code; a complete ordered event history is replayed to resume after failuresRetries skip completed steps; durable promises and timers keep waiting code recoverable
Serverless suspensionConfirm with Temporal how worker-based execution fits serverless hostsSuspends waiting code so it can run on serverless deployments
State handlingState lives in the workflow history and the persistence stores you configure (Cassandra, PostgreSQL or MySQL)Consistent per-entity key-value state managed by the Restate server
Exactly-once service communicationConfirm the exact delivery guarantees for activities and signals in the Temporal documentationListed as a core primitive; confirm the exact scope with Restate
UI and tracingWeb UI with OIDC single sign-on; confirm trace export options for your observability stackUI and CLI with OpenTelemetry traces
Self-hosted high availability modelSeparate Frontend, History, Matching and Worker services with a persistence store and a visibility storeHighly available clusters use partition and log replication, per Restate's cluster documentation
Managed optionsTemporal Cloud, with pay-as-you-go pricing and SAML SSORestate Cloud and Restate BYOC, alongside self-hosted Restate
Authorization defaultsThe default noopAuthorizer allows every API request until you configure an AuthorizerConfirm default access control and authentication settings for your deployment with Restate
Latest release version and dateTemporal Server v1.32.1, published October 8, 2026Restate v1.8.0, published October 14, 2026

How deterministic replay and durable state differ in practice

Temporal and Restate both make workflows survive crashes, but they rebuild state in different ways, and that difference sets what your developers must get right. Temporal keeps a complete, ordered event history for each workflow and rebuilds state by replaying that history through the workflow code. For replay to produce the same result, the code must be deterministic: clock reads, random values, network calls and similar nondeterministic operations have to go through Temporal's SDK calls so that the recorded results are reused on replay. The practical cost is versioning. When you change workflow code while old executions are still open, you must guard the changed branches with the SDK's versioning calls or deploy with a worker versioning strategy, or running workflows can fail replay. Confirm the exact mechanism for your SDK language in the Temporal documentation before you write your first long-running workflow.

Restate takes a different path. It persists per-entity key-value state for each keyed service object and records the progress of each handler, so a retry skips the steps that already completed instead of replaying the whole history through the code. Developers do not have to make the entire handler deterministic, but they do have to design around keyed state: decide which key owns which state, keep handlers for one key free of conflicts with each other, and decide what happens to state when a handler changes shape. Restate's README describes durable execution with retries that skip completed steps, consistent per-entity state and suspension of waiting code for serverless deployments, so confirm how a given SDK handles changes to a handler that is already in flight.

The trade-off matters most in two places. Long-running, human-paced processes, such as an approval that waits days for a person, put heavy weight on Temporal's replay model, because every open execution must stay compatible with every code change you ship during its lifetime. High-volume services organized around a business key, such as one account or one order, usually fit Restate's model better, because state stays close to the key and waiting code can be suspended. Before you choose, run one representative workflow through a code change in a test environment and record how each runtime behaves on an open execution.

What the licenses allow and where each platform sells paid options

Temporal Server is MIT licensed, so your team can run, modify and redistribute the server code without a license fee from Temporal Technologies. Temporal also sells Temporal Cloud, a managed service where Temporal operates the clusters. That managed option is a separate paid product, and its published pay-as-you-go terms are the main paid figures to model.

  • MIT server license: The open-source server can be self-hosted in your own cloud accounts or data centers under the MIT terms.
  • Managed service: Temporal Cloud is run by Temporal Technologies, so cluster operation becomes a vendor responsibility under its terms.
  • Starting rate: Pay-as-you-go pricing starts at 50 US dollars per million actions.
  • Storage rates: Active storage is listed at 0.042 US dollars per GB-hour and retained storage at 0.00105 US dollars per GB-hour.
  • SLA tiers and SSO: The listed SLA is 99.9%, or 99.99% with high availability, and SAML SSO is included in the published terms.

Confirm with Temporal what counts as an action, how storage is metered, and which tier includes high availability, because the published page can change and your workload pattern drives the bill.

What drives the running cost of each runtime

Running Temporal or Restate costs less in licenses than in the people, infrastructure and upgrades that keep the cluster healthy. The cards below separate one-time work from recurring spend and name what to request in a written quote from each vendor or partner.

Temporal cluster and store infrastructure

A self-hosted Temporal Service runs Frontend, History, Matching and Worker services, plus a persistence store and a separate visibility store. Each of these is a recurring infrastructure line item, and visibility on Elasticsearch or OpenSearch is recommended once workflow volume grows. Ask the partner to price each store separately, including backups and the high-availability topology you require.

Restate cluster and replication

Highly available self-hosted Restate clusters use partition and log replication, so the recurring footprint is the replicas you run across your own infrastructure. Confirm the node count, storage, and network needed for your availability target before comparing it with Temporal's cluster. Ask whether the quote covers cluster sizing tests under your expected load.

Staff skills for each model

Temporal's SDK model requires developers to write deterministic workflow code and operators to run a multi-service cluster, which favors teams with Go, Java, TypeScript or Python depth. Restate asks for similar SDK discipline plus its own server operations. Price the skills gap as a recurring cost in your own team's time, and ask the vendor or partner which runbooks they will hand over.

Upgrade effort and ordering

Temporal's guidance is to upgrade one minor version at a time, move to the latest patch of the current minor first, and run schema upgrades before server upgrades when release notes require them. Each upgrade is a recurring effort item in a test environment. Ask how Restate's upgrade path handles cluster rollouts and compatibility, and whether upgrade support is inside or outside the quoted retainer.

License review for Restate terms

Restate is licensed under the Business Source License 1.1, which permits production use for your own services and internal platforms but excludes running a Public Restate Platform Service. This review is one-time work for most businesses, but it becomes recurring if your product model changes. Ask counsel to review the additional use grant against your offering, and get a written opinion before you commit to a design.

Managed service spend

Temporal Cloud is priced on usage, with pay-as-you-go pricing that starts at 50 US dollars per million actions, plus active and retained storage charges and an SLA tier. Restate Cloud and BYOC are priced separately, and the quote should show how usage, storage and retained data are metered. Ask both vendors for a worked estimate based on your actual action volume and retention period.

Moving from one runtime to the other: what transfers and what is rebuilt

This sequence shows which parts of a workflow service carry over between Temporal and Restate, which parts must be rebuilt, and what your team should confirm with each vendor before any cutover work starts.

  1. Inventory workflows and their in-flight state

    List every workflow type, signal, query, timer and activity your service runs, and record how many executions are open at any time and how long they typically last. Note which code paths depend on Temporal-specific features such as signals, queries, child workflows or versioning markers. Workflow history and state do not transfer as a file, so this inventory is what tells you which executions can be finished on the old runtime and which must be restarted on the new one. The step is done when every workflow type has an owner and a status: keep as is, rewrite, or retire.

  2. Decide whether in-flight executions drain or migrate

    For each long-running workflow, choose between letting open executions finish on the existing Temporal cluster (drain) and starting new executions on Restate while the old ones complete. Migrating a running execution mid-flight is not a file copy: it would mean re-creating its state and progress in the new runtime, which is a custom build with its own correctness risk. Confirm with Restate how its state and durable promises should be handled for work that is already underway, and confirm with Temporal what your retention settings are for closed history. The output is a written decision per workflow type.

  3. Rewrite handlers for the new programming model

    Translate each workflow and activity into Restate's handler model, which uses durable steps, awaited promises, timers and per-key state rather than Temporal's workflow and activity split. Keep business logic in plain functions where possible so that it can be tested without either runtime. Expect changes wherever code depended on Temporal's deterministic replay rules, such as avoiding non-deterministic calls inside workflow code. The step is complete when the new handlers compile against the Restate SDK your team chose, with a review of each change against the original behavior.

  4. Rebuild retries, timers and observability

    Re-express retry policies, backoff, timeouts and scheduled waits in the Restate SDK and confirm each one behaves as the original did under failure. Rebuild dashboards, alerts and trace propagation so that the Restate UI and CLI, with its OpenTelemetry traces, show the same business events your operators rely on today. Also rebuild any Temporal visibility queries your team uses for support, because those will not port automatically. The step is done when a sample of failing executions shows the same retry counts, alert triggers and trace links in the new environment.

  5. Test replay and recovery behavior

    Run failure injection tests: kill the service mid-workflow, restart the runtime, and confirm that completed steps are skipped and waiting steps resume rather than repeat. Include external side effects such as payments or emails and check that idempotency keys prevent duplicates. Repeat the tests on a clustered self-hosted Restate deployment if you plan to run one, since its partition and log replication behavior is part of what you are validating. The output is a recorded test report that your engineering and security owners sign off.

  6. Cut over traffic in a controlled window

    Route new triggers to Restate in stages, starting with the lowest-risk workflow types, and keep the Temporal cluster running until every drained execution has closed. Confirm the cutover order and rollback steps in writing before the window opens, and keep a named owner for each workflow type. The cutover is complete when all new executions start on Restate, no executions remain open on Temporal, and monitoring has been reviewed through a full business cycle chosen by your team.

  7. Decommission the old runtime and retire its data

    After the final Temporal execution closes, back up any history or visibility data your audit or retention policy requires, then shut down Frontend, History, Matching and Worker services and remove their persistence and visibility stores according to your data retention rules. Revoke service accounts, certificates and network rules that only the old cluster used. The step is done when a documented inventory confirms that no runtime, store or credential from the old platform remains in active use. Before starting, confirm with each vendor the supported export options and any license terms that apply to the components you run.

What implementing each runtime involves and where projects run long

Implementing self-hosted Temporal means building a cluster before any workflow ships. A self-hosted Temporal Service runs Frontend, History, Matching and Worker services, plus a persistence store and, for advanced visibility, a separate visibility store. The persistence choice is the first decision: Temporal tests Cassandra, PostgreSQL and MySQL, and SQLite is for development only. Visibility needs its own plan, with Elasticsearch or OpenSearch recommended once executions grow beyond a few. Identity is the next block of work. The default noopAuthorizer allows every API request, so teams must configure mTLS for internode and frontend traffic, a ClaimMapper that maps JWT or certificate claims to namespace roles, an Authorizer, and OIDC for the Web UI. Payload encryption through a custom codec and codec server is a separate build item that also touches every SDK client. Confirm which deployment method your platform team will use, since Helm chart versions below 0.73.1 do not work with server images 1.30 and later.

Implementing Restate shifts most of the work into your services. The server is deployed as a single binary or container, but the larger effort is integrating an SDK (TypeScript, Java or Kotlin, Python, Go or Rust) into existing services so that handlers, retries and durable state follow the Restate model. Teams should decide how suspension for serverless deployments will work in their environment and design the high availability cluster early, using the partition and log replication described in the Restate documentation on highly available clusters. Confirm the cluster sizing and replication settings with Restate and your own infrastructure team, because these are not fixed by the facts in this page.

Projects run long in predictable places. On the Temporal side, determinism and versioning cause most rework: workflow code must replay identically, so changes to running workflows need a versioning plan agreed before the first production release, and Temporal server upgrades must proceed one minor version at a time. On the Restate side, the licensing review and service registration boundaries need attention early. The Business Source License excludes running a Public Restate Platform Service, so any plan to let third parties register their own services should go to legal review before design. Identity integration is the shared risk for both platforms, because mTLS, token claims and SSO touch the network, directory and audit teams. DeployOpen works on fixed-scope agreements with deliverables set in writing before work starts, and timelines depend on the agreed scope, the number of services and the identity systems involved.

Questions buyers ask before choosing or hiring help

Does Restate's license let my company run its own services in production?

Yes, for the use described in the license. Restate is licensed under the Business Source License 1.1, and its additional use grant allows any use except running a Public Restate Platform Service, which is a managed service where third parties register and invoke their own services through Restate's APIs. The license explicitly permits production deployments that invoke your own services and internal managed platforms. The change license is Apache 2.0, applied four years after each release. If you plan to offer Restate-backed execution to outside customers, have counsel read the full Restate LICENSE against that model before you commit.

What does Temporal's noopAuthorizer default mean for a new deployment?

It means a self-hosted Temporal Service without a configured Authorizer accepts every API request with no authentication or access control. Before any user or service reaches the cluster, you need to configure an Authorizer, a ClaimMapper that maps JWT or certificate claims to namespace roles, and mTLS for frontend and internode traffic. Temporal's deployment guidance also says services should run on hosts not reachable from the public internet. Treat the default as a setup gap to close in the first iteration of the platform, and confirm the exact configuration with Temporal's security documentation for your version.

Can my team self-host Temporal or Restate without outside help?

A team with Kubernetes or container operations experience and a database platform it already runs can self-host either one. Temporal needs its Frontend, History, Matching and Worker services, a persistence store (Cassandra, PostgreSQL or MySQL) and, for advanced visibility, Elasticsearch, OpenSearch or a supported SQL database. Restate ships single binaries and Docker images and documents highly available clusters with partition and log replication. The harder parts are sizing, upgrade sequencing, backups, monitoring and on-call runbooks, which are the areas where teams most often ask for help. Assess your own skills honestly against the Temporal deployment documentation and the Restate cluster documentation before deciding.

What drives implementation cost, and what should a written scope include?

Implementation cost follows scope: how many services are migrated, the number of languages and SDKs involved, the persistence and visibility design, security integration with your identity provider, high-availability requirements, and the testing and runbooks you need. DeployOpen works from fixed scopes agreed in writing before work starts, and does not publish a price list. A written scope should name the platform and version, the environments, the persistence and visibility stores, the identity and TLS integration, backup and upgrade procedures, documentation deliverables, acceptance criteria and what is excluded. Ask each bidder to state which items are one-time work and which are recurring retainers for support or upgrades.

How long does a migration between Temporal and Restate usually take?

No fixed duration is supplied for this migration, so treat any single number with caution. The duration depends on how many workflows are in flight, whether running executions must finish on the old engine or be moved, how much workflow code must be rewritten to the other programming model, how many services call those workflows, and how much history or state needs to be retained. Running both platforms in parallel for a period is a common pattern to reduce risk. Ask vendors and implementation partners to break the estimate into inventory, code changes, testing, cutover and decommissioning, and to name the assumptions behind each.

Which language SDKs should I check against our existing code?

Start with the languages your workflow code and workers already use, then check SDK maturity for each. Temporal workflows are written in general-purpose languages such as Go, Java, TypeScript and Python. Restate publishes SDKs for TypeScript, Java and Kotlin, Python, Go and Rust. Confirm for each language which features your team needs, including deterministic replay rules and versioning in Temporal, and handler, state and timer APIs in Restate. Check the current SDK documentation and release notes for the exact versions you plan to run, since SDK support changes between releases.

Does a managed service like Temporal Cloud reduce the operating burden?

It shifts part of the burden, but it does not remove governance work. Temporal Cloud is a managed service from Temporal Technologies, and the researched pricing page lists pay-as-you-go pricing starting at 50 US dollars per million actions, with a 99.9% SLA or 99.99% with high availability. Your team would still own workflow design, payload handling, access policies, data residency decisions and integration with your identity provider. Restate also offers Restate Cloud and Restate BYOC alongside self-hosting. Compare each managed option's terms, regions and exit path with the self-hosted cost of your own staff time before deciding.

Can DeployOpen help us choose between Temporal and Restate?

DeployOpen plans, implements, integrates, hardens, backs up, upgrades, documents and supports self-hosted open-source platforms inside your own infrastructure. A typical engagement starts with a written scope that compares your workflow inventory, language mix, licensing constraints and security requirements against the two platforms. Most engagements are fixed-scope, with scope, deliverables and timelines agreed in writing before work starts. Ongoing support, upgrades and continuous testing are available as retainers. DeployOpen does not publish a price list, so ask for a quote based on the written scope.

How DeployOpen helps teams choose, implement or migrate

DeployOpen plans, implements and supports self-hosted open-source platforms inside your own cloud accounts, data centers or air-gapped networks. For Temporal vs Restate, that means turning the licensing, persistence and clustering questions in this comparison into a written scope before any build work starts.

How we scope

  • Confirm which runtime fits your services, languages and operating model before any build begins
  • Record the Business Source License questions for your intended use in the written scope
  • Agree deliverables, timelines and exclusions in writing, since most engagements are fixed-scope

How we build

  • Deploy the chosen runtime in your environment, including its persistence and clustering layout
  • Integrate identity, network controls and TLS settings with your existing infrastructure
  • Test failure recovery, retries and state handling against the workflows your teams actually run

How we hand over

  • Document the architecture, upgrade path and configuration decisions for your own operators
  • Provide runbooks for backups, version upgrades and cluster failover in your environment
  • Walk your engineers through the SDK patterns and workflow conventions chosen for your team

How we support

  • Offer ongoing support, upgrades and continuous testing as a retainer after handover
  • Review each new runtime release and its license terms before it reaches production
  • Keep documentation current as your services, licenses and infrastructure change over time

Sources and further reading

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