Open-source alternative to Notion projects and tasks

Decide by what the document does. Long-form material such as policies, runbooks and onboarding guides usually belongs in a wiki such as Docmost, which has spaces, page history, comments and permissions built for documents that change slowly and are read by many people. Docmost's import dialog accepts a Notion export ZIP, so these pages can move with their hierarchy intact. Notes that exist only to explain a specific project, cycle or work item are a better fit for Plane pages, where they stay next to the tasks they support. Before you commit, confirm in Plane's current documentation which page features your edition provides, how pages are organized and who can see them, because those answers decide whether a document can live there at all.

The main risk is splitting knowledge across two tools. When a policy sits in Docmost and a related task sits in Plane, search, ownership and review dates can drift apart, and people stop knowing which copy is current. Set one rule per document type and write it down: for example, every policy and runbook lives in the wiki, and project pages hold only decisions made within one project. Also check the access model early. Page-level permissions, page verification with approval and SCIM provisioning are listed as Docmost paid-edition features, so a document that must be restricted or formally approved may add a licence cost that changes the comparison with Plane's paid plans.

Links between tasks and documents need a test before migration. Import a sample Notion export into Docmost and check whether internal links between pages still work after the import, because links that pointed to Notion addresses may not follow the pages automatically. Then create a Plane task that references a Docmost page and confirm how it displays and whether the reference survives a later reorganization of either tool. Keep a simple register that maps each task or project to the wiki pages it depends on, and assign an owner to update it. Without that register, broken references are usually discovered only when someone needs the runbook during an incident.

The main gap is in how flexible each tool is with data. Notion lets a team build databases from blocks, with relations, rollups, formulas and linked views, and rearrange them without a schema change. Plane and OpenProject are built around fixed work item types, states, custom fields and saved views, so a Notion database with several interlinked tables, computed columns or bespoke formulas will usually need to be simplified or split. Before committing, take your most complex Notion database, export it as CSV, and rebuild it in the candidate tool with its real relations and calculated fields. Record which formulas survive as native fields, which need a workaround and which you will drop. That test will tell you more than any feature comparison, and it should be done with the people who maintain those databases today.

AI features are another area where Notion is ahead of both tools. Notion's built-in AI writing, summarization and search across the workspace have no direct equivalent in Plane or OpenProject, so if your team relies on them for task triage or status summaries, plan for that work to move elsewhere or stop. Confirm current AI capabilities directly with each vendor, since these products change quickly and you should not assume parity from marketing material. If you also move from Jira, check the status of OpenProject's Jira Migrator carefully. Its documentation describes it as beta and advises use only in test setups, and it imports from Jira Data Center 10.x and 11.x rather than Jira Cloud. Plane's Jira importer covers Jira Cloud as well as Server and Data Center, so the migration path may differ depending on which tool you choose.

Running Plane or OpenProject is a recurring operations job, not a one-time install. Both products are self-hosted and ship on their own release cycles, so your team owns every upgrade, every backup and every alert. Plane publishes three editions (Community, Commercial and Airgapped), each with its own codebase and release cycle, so confirm which edition you install before you plan upgrade windows. OpenProject ships its own versions, such as 17.9.0 released on September 30, 2026 and 17.9.2 on October 15, 2026, so plan a regular check of the release notes and test each upgrade in a staging copy first.

Backups need to cover more than the application. A Plane deployment depends on PostgreSQL, Redis or Valkey, RabbitMQ and S3-compatible object storage such as MinIO, and an OpenProject deployment depends on PostgreSQL and its file storage. Back up the database and the attachment store together, on the same schedule, and test a restore into a separate environment. Ask whether the database is managed by your cloud provider or run by your team, because that decides who holds the backup and restore procedure. Monitoring should cover the web and API containers, queue health, disk space on the database and object store, and certificate expiry, so that failures reach an on-call person rather than a project manager.

OpenProject has a hard database requirement to plan for. Since OpenProject 16.0.0 it officially supports PostgreSQL 16 or later, and it requires the pg_trgm, btree_gist and unaccent extensions. If your current PostgreSQL service runs an older major version, or your managed database does not let you create these extensions, resolve that before the first install, not during a migration window. Confirm the extension list against the current system requirements, and ask your database provider whether they are allowed on your plan. Finally, decide who owns each task: upgrades, backups, patching the operating system, and responding to alerts. Without named owners, the admin load tends to fall on whoever installed the system.