Braintrust
Braintrust is an enterprise-grade AI evaluation and observability platform that helps teams test, monitor and improve AI systems from development through production. It combines systematic evals, production tracing, prompt and model experimentation run directly on logged traces, and detailed LLM cost tracking down to the user, feature or agent run. It's used inside leading companies including Notion, Replit, Cloudflare, Ramp, Dropbox, Vercel and BILL. In February 2026 Braintrust raised an $80M Series B led by ICONIQ at an $800M valuation. Pricing starts with a free Starter plan (no card required; 1GB processed data, 10,000 scores, 14-day retention), a $249/month Pro plan, and enterprise tiers above that.
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Our take
Braintrust is an eval-and-observability platform for teams shipping serious AI products. It pairs systematic evals with production tracing, prompt and model experimentation on logged traces, and cost tracking, so quality checks become repeatable rather than vibes. It's used inside Notion, Vercel, Cloudflare and Ramp. There's a free Starter tier; serious use is Pro at $249 or enterprise.
Best for
Product and AI teams that want evaluation, experimentation and monitoring on one platform, and are willing to pay for depth as they scale.
Pros
- Evals, experimentation and observability in one workflow
- Per-user, per-feature and per-agent cost attribution
- Trusted inside Notion, Vercel, Cloudflare, Ramp and others
- Free Starter tier to begin
Cons
- Pro at $249/month and enterprise pricing climb fast
- More than small projects need
- Eval and observability space is competitive
How it compares
Against open-source Langfuse, Braintrust is a managed, enterprise-leaning platform with deeper experimentation; against ML-monitoring tools, it's more focused on product developers shipping LLM features.
Full review
Braintrust is an enterprise-grade AI evaluation and observability platform that helps teams test, monitor and improve AI systems from development through production. It combines systematic evals, production tracing, prompt and model experimentation run directly on logged traces, and detailed LLM cost tracking down to the user, feature or agent run. It's used inside leading companies including Notion, Replit, Cloudflare, Ramp, Dropbox, Vercel and BILL. In February 2026 Braintrust raised an $80M Series B led by ICONIQ at an $800M valuation. Pricing starts with a free Starter plan (no card required; 1GB processed data, 10,000 scores, 14-day retention), a $249/month Pro plan, and enterprise tiers above that.
Against open-source Langfuse, Braintrust is a managed, enterprise-leaning platform with deeper experimentation; against ML-monitoring tools, it's more focused on product developers shipping LLM features.
Cloudkart Trust Graph
4.0/5- Actual Utility5/5
Source: Initial LLM-authored rubric (backfill)
- Ease of Use4/5
Source: Initial LLM-authored rubric (backfill)
- Pricing Fairness3/5
Source: Initial LLM-authored rubric (backfill)
- Reliability4/5
Source: Initial LLM-authored rubric (backfill)
- Differentiation4/5
Source: Initial LLM-authored rubric (backfill)
Scored as of . Each score is versioned and auditable; vendors cannot buy it.
How this score is set
- Editorial rubric
- Primary signal — five dimensions, 4.0/5 average.
- Community reviews
- None yet.
- Pricing verified
- Not yet verified
- Independence
- Score set by our editorial team before any affiliate relationship is considered. No vendor can buy it.
Frequently asked questions
- Is Braintrust free, and how much does it cost?
- Braintrust has a free tier, with paid plans that unlock advanced features.
- Who is Braintrust best for?
- Product and AI teams that want evaluation, experimentation and monitoring on one platform, and are willing to pay for depth as they scale.
- How is Braintrust rated on Cloudkart.ai?
- Braintrust scores 4.0 out of 5 on the Cloudkart.ai rubric, which weighs actual utility, ease of use, pricing fairness, reliability and differentiation. Scores are set editorially and can never be bought.
Community reviews
No community reviews yet. Be the first to share how Braintrust works for you.
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Compare Braintrust head-to-head: vs Streamlit · vs Langfuse · vs Metabase · vs Firecrawl