Langfuse is freemium — a usable free tier with paid plans above it. Promptfoo is freemium — a usable free tier with paid plans above it. Both are listed under LLM Eval & Observability, so this is a like-for-like comparison. Neither is ranked above the other — Flocci carries no sponsored placement.
Langfuse is freemium — a usable free tier with paid plans above it and is listed for fully open-source and self-hostable for free via Docker Compose/Kubernetes, not just a hosted SaaS. Promptfoo is freemium — a usable free tier with paid plans above it and is listed for open-source CLI/library for evaluating prompts, models and RAG pipelines side by side, runs in CI. Both sit in LLM Eval & Observability.
Neither — Langfuse and Promptfoo are both freemium, so the choice comes down to capability rather than cost. Both entries list what they uniquely do above.
Choose Langfuse if you need fully open-source and self-hostable for free via Docker Compose/Kubernetes, not just a hosted SaaS; choose Promptfoo if you need open-source CLI/library for evaluating prompts, models and RAG pipelines side by side, runs in CI. Flocci AI Tools does not rank one above the other — it shows both feature sets side by side and lets the requirement decide.
| Langfuse | Promptfoo | |
|---|---|---|
| Pricing tier | Free tier + paid plans | Free tier + paid plans |
| Free to start | Yes | Yes |
| Category | AI Models & Local Execution | AI Models & Local Execution |
| Type | LLM Eval & Observability | LLM Eval & Observability |
| Listed capabilities |
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| Tags | langfuse, llm observability, prompt management, tracing, open source, free, evaluation | promptfoo, prompt testing, llm red teaming, eval framework, open source, free, ci for prompts |
| Website | langfuse.com | promptfoo.dev |
| Full page | Langfuse details → | Promptfoo details → |
| Alternatives | Langfuse alternatives → | Promptfoo alternatives → |