Botpress
86 · HealthyStudio for building LLM chatbots and agents, with knowledge bases and connectors for web chat, WhatsApp and other channels.
Open source alternatives to Voiceflow
3 open source projects replace Voiceflow, ranked by how safe each is to depend on.
Parlant
79 · StableFramework for customer-facing AI agents that follow explicit guidelines, so their answers stay consistent and on policy.
Flowise
ArchivedDrag-and-drop builder for LLM agents and chatflows.
Source-available and unverified licenses
The code for these is public, but the license is not an OSI open source license, or we have not verified it yet. Check the license notes on each project before relying on it.
Dify
91 · HealthyPlatform for building LLM apps, agents and RAG pipelines with a visual workflow editor.
At a glance
Health and license are separate verdicts: a project can be well maintained and still not be open source.
| Project | Health | License | Stars |
|---|---|---|---|
| Botpress | 86 · Healthy | Free to useMIT | 15k |
| Parlant | 79 · Stable | Free to useApache-2.0 | 18k |
| Flowise | Archived | Free core, paid extrasApache-2.0 | 55k |
| Dify | 91 · Healthy | Free with conditionsDify Open Source License | 158k |
More in AI app builders
Voiceflow is a paid AI app builders product. See all open source AI app builders tools, ranked the same way.
Scores last refreshed from GitHub on 9 October 2026. How we score.