Free Langfuse Alternatives (2026)
Langfuse: free Hobby plan; open source self-host (checked ); paid plans start at $29 a month. The top free Langfuse alternatives we've verified are Braintrust (free plan), Arize Phoenix (self-host) and Helicone (free plan), all checked . All 4 picks below are free for at least a week. Langfuse — Open-source LLM observability and evals. Below are eligible free alternatives among LLM observability and eval platforms.
4 free alternatives
Evals and observability platform for AI products. Best for AI engineers. Key features: Tracing; Evals; Playgrounds.
Free forever, Free plan for evals and logging
Free accountTry
Open-source LLM tracing and evaluation. Best for AI engineers. Key features: Tracing; Evaluations; Experiments.
Free forever, Open-source and free cloud tier
Self-hostTry
- Kind of free
- Free plan
- Checked
- 2026-11-12
- What's free
- Free plan for evals and logging
- Kind of free
- Self-host
- Checked
- 2026-11-12
- What's free
- Open-source and free cloud tier
- Kind of free
- Free plan
- Checked
- 2026-11-12
- What's free
- Monthly requests
- Kind of free
- Free plan
- Checked
- 2026-11-12
- What's free
- Free Developer plan: 5k traces per month
Is Langfuse free?
Langfuse — Free plan: Free Hobby plan; open source self-host. Verified on 2026-11-12.
FAQ
- Which free Langfuse alternatives are free forever?
- All 4 here have a free plan with no end date: Braintrust, Arize Phoenix, Helicone and 1 more. Each listing shows its free limits and the day we checked them.
- Are any free Langfuse alternatives open source?
- Yes: Arize Phoenix is open source and free to run yourself.
- How do you check these free plans?
- We read each maker's own pricing page and note the day we checked; the newest check on this page is 12 Nov 2026. Rank follows our published rules: paid placements are always labelled, and payment can't buy rank.
