head to head · open source
Langflow vs Fonoster
Langflow has 156,266 GitHub stars, 10,311 forks, 1,056 open issues and last shipped yesterday. Fonoster has 8,162 stars, 566 forks, 22 open issues and last shipped 2 days ago. Langflow leads on adoption by 1,815% (156,266 vs 8,162 stars). Langflow is written in Python under MIT; Fonoster is written in TypeScript under MIT. Langflow has attracted 7% as many forks as stars, Fonoster 7%. Langflow was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| Langflow | Fonoster | |
|---|---|---|
| GitHub stars | ★ 156K | ★ 8.2K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-11-02 | 2026-11-01 |
| Forks | ⑂ 10K | ⑂ 566 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Langflow if
- You weight community size — 156K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Fonoster if
- You want the Fonoster feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Fonoster fits your workflow better
About Langflow
Langflow is a powerful platform for building and deploying AI powered agents and workflows. It provides developers with both a visual authoring experience and built in API and MCP servers that turn every workflow into a tool that can be integrated into applications built on any framework or stack. Langflow comes with batteries included and supports all major LLMs, vector databases and a growing library of AI tools. ✨ Highlight features Visual builder interface to quickly get started and iterate. Source code access lets you customize any component using Python. Interactive playground to immediately test and…
read the full Langflow overview →
About Fonoster
Fonoster: The open source alternative to Twilio Fonoster is researching an innovative Programmable Telecommunications Stack that will allow businesses to connect telephony services with the Internet entirely through a cloud based utility. Features The most notable features of Fonoster are: [x] Multitenancy [x] Easy deployment of PBX functionalities [x] Programmable Voice Applications [x] NodeJS SDK [x] Support for Amazon Simple Storage Service (S3) [x] Secure API endpoints with Let's Encrypt [x] Authentication with OAuth2 [X] Authentication with JWT [x] Role Based Access Control (RBAC) [x] Plugins based Command…
read the full Fonoster overview →
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Frequently asked questions
Is Langflow or Fonoster more popular?
Langflow has 156,266 GitHub stars and Fonoster has 8,162. Langflow has the larger community by that measure.
Are Langflow and Fonoster free?
Both are open source. Langflow is licensed under MIT and Fonoster under MIT. Neither carries a licence fee.
What is the difference between Langflow and Fonoster?
Langflow is written in Python and Fonoster in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Langflow or Fonoster?
Choose Langflow if you want the larger community (156,266 stars) or its MIT licence terms. Choose Fonoster if its feature set, stack or MIT licence fits better. Both are self-hostable.