head to head · open source
Trigger vs harmonist
Trigger has 16,345 GitHub stars, 1,464 forks, 342 open issues and last shipped today. harmonist has 2,257 stars, 206 forks, 1 open issues and last shipped 3 months ago. Trigger leads on adoption by 624% (16,345 vs 2,257 stars). Trigger is written in TypeScript under Apache-2.0; harmonist is written in Python under MIT. Trigger has attracted 9% as many forks as stars, harmonist 9%. Trigger was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai-agents, orchestration), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Trigger | harmonist | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 2.3K |
| License | Apache-2.0 | MIT |
| Written in | TypeScript | Python |
| Last push | 2026-09-20 | 2026-06-09 |
| Forks | ⑂ 1.5K | ⑂ 206 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Trigger if
- You weight community size — 16K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick harmonist if
- You want the harmonist feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and harmonist fits your workflow better
About Trigger
Trigger is an open source TypeScript platform for building and deploying AI agents and workflow tasks. It lives in the infrastructure, orchestration, and scheduling ecosystem, and it is positioned as a way to run long running AI tasks without typical serverless timeout constraints. The project provides a software development kit, a deployment target, and operational features such as retries, queues, observability, and elastic scaling.
read the full Trigger overview →
About harmonist
harmonist is an MIT licensed, dependency free Python framework that adds multi agent orchestration and mechanically enforced protocol to AI coding assistants such as Cursor, Claude Code, Copilot, Windsurf, and Aider, and it serves individual developers and teams who need agent workflows to obey engineering rules rather than merely be asked to follow them.
read the full harmonist overview →
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Frequently asked questions
Is Trigger or harmonist more popular?
Trigger has 16,345 GitHub stars and harmonist has 2,257. Trigger has the larger community by that measure.
Are Trigger and harmonist free?
Both are open source. Trigger is licensed under Apache-2.0 and harmonist under MIT. Neither carries a licence fee.
What is the difference between Trigger and harmonist?
Trigger is written in TypeScript and harmonist in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Trigger or harmonist?
Choose Trigger if you want the larger community (16,345 stars) or its Apache-2.0 licence terms. Choose harmonist if its feature set, stack or MIT licence fits better. Both are self-hostable.