Free Braintrust Alternatives (2026)
Braintrust has a free plan for evals and logging (checked ); paid plans start at $249 a month. The top free Braintrust alternatives we've verified are Langfuse (free plan), Arize Phoenix (self-host) and Helicone (free plan), all checked . All 4 picks below are free for at least a week. Braintrust — Evals and observability platform for AI products. Below are eligible free alternatives among LLM observability and eval platforms.
4 free alternatives
Each with what's free and when we checked
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 Hobby plan; open source self-host
- 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 Braintrust free?
Braintrust — Free plan: Free plan for evals and logging. Verified on 2026-11-12.
FAQ
- Which free Braintrust alternatives are free forever?
- All 4 here have a free plan with no end date: Langfuse, Arize Phoenix, Helicone and 1 more. Each listing shows its free limits and the day we checked them.
- Are any free Braintrust 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.
