Braintrust
Developer-centric LLM evals and observability with CI/CD gating.
About
Braintrust is a developer-centric evaluation and observability platform: datasets, scorers, and experiments with GitHub Action integration that can gate PRs on score drops — the closest thing in this batch to eval-driven CI. Also offers agent evaluation workflows.
Free tier: 1 GB data/mo, 10k scores, 1M spans, 14-day retention; metered overage. The braintrust-proxy repo is MIT but small — the platform is the real product. Funded ($30M+ valuation cited in third-party comparisons).
What it can do
- Datasets, scorers, and experiments
- CI/CD gating via GitHub Action
- Agent evaluation workflows
- 1M spans/mo on free tier
- Collaborative eval workflows
Setup
- Sign up at braintrust.dev.
- Install the SDK (
pip install braintrust/ npm). - Log spans and define scorers in code.
- Add the GitHub Action to gate PRs on eval regressions.
Prerequisites
Braintrust account (free tier); API key.
Use cases
Works with
Trust score — 7/10
Scored 7/10 (metrics tier). Strong developer-experience story (CI gating is genuinely differentiating) with a usable free tier, but closed SaaS and the open repo is a thin proxy — most evidence is vendor or third-party-comparison sourced. Metrics tier.
★ 412 GitHub stars
How the trust score is built
Full methodology →- Adoption · stars/downloads, log-scaled vs peers
- 5.3/10
- Maintenance · recency, releases, issue load
- 5.7/10
- Openness · license + docs
- 9.4/10
- Manual review · sanity read + red-flag check
- 8.0/10
- · 412 GitHub stars (log-scaled vs catalog peers)
- · last push 42d ago; 0 releases/12mo; 12 open issues
- · manual review: developer-centric evals with CI/CD gating; proxy repo is small — platform is the product; license: MIT (proxy repo; platform closed SaaS)
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.