Open source. Split licensed.

Every component has a license chosen for the right reason. Agents are Apache 2.0 so your app code is never AGPL-tainted. The brain is AGPL v3 to keep the playing field level.

Agent packages: Apache 2.0

z4j-django, z4j-flask, z4j-fastapi, z4j-bare, z4j-celery, z4j-rq, z4j-dramatiq, z4j-huey, z4j-arq, z4j-taskiq, and all scheduler packages.

✓ Use in proprietary applications
✓ Modify, fork, redistribute
✓ No copyleft obligations on your code

Brain: AGPL v3

z4j-brain: the dashboard, REST API, WebSocket server, Postgres models, reconciliation worker.

✓ Self-host freely for internal use
✓ Modify and deploy internally
⚠ If you serve modifications to third parties over a network, you must open-source them

Commercial license

For organizations with AGPL-incompatible policies. Contact licensing@z4j.com.

Our commitments

• Every released version keeps its license permanently. No retroactive re-licensing.
• Security fixes ship in the open-source release on the same day as any commercial release.
• The roadmap is public. Commercial direction is announced openly.
• We make no "free forever" pledge. We commit to license stability, open roadmap, and honest communication.

Questions about licensing?

We're happy to clarify any licensing concerns.

Contact licensing Read full details