Braintrust
Observability & Evals · Free + paid
LLM evaluation and prompt management platform
At a glance
- Made by
- Braintrust
- Korean
- None (English and a few others only)
- API
- Yes
- Available on
- Web, CLI, API
- Open source
- Some open-source libraries and tools (license name not given on the page)
What is Braintrust?
Braintrust is an active observability platform for instrumenting, understanding, and improving agents. It applies intelligence to agent traces and automatically surfaces the most important patterns so you can understand behavior in production. You can run experiments on real datasets, compare prompts and models side by side, and score outputs with LLMs, code, and humans. It turns production traces into evaluation datasets in one step, and connects to your development environment through an MCP server, a CLI, and SDKs in multiple languages.
- Real-time inspection of agent traces and tool calls, with latency, cost, and quality tracking
- Evaluations and experiments scored by LLMs, code, and humans
- Natural-language trace investigation and automatic pattern discovery (Patterns)
- Loop agent that automatically generates prompts, scorers, and datasets
- One-click conversion of production traces into evaluation datasets
- MCP server for IDEs
- Python·TypeScript·Go·Ruby·C# SDK
- Brainstore, a database for AI data (hybrid deployment)
Who uses Braintrust and for what
- Find and fix agent problems in production and block bad releases
- AI evaluation for a large engineering organization (Notion case)
- Quality control for AI code review (Graphite case)
Pricing
What you get for free — Yes (Starter $0: $10 credit, 1GB processed data, 10k scores, 14-day retention, unlimited users)
| Plan | Price | Main limits |
|---|---|---|
| Starter | $0/mo | $10 credit + token pricing, 1GB processed data (+$4/GB), 10k scores (+$2.50/1k), 14-day retention |
| Pro | $249/mo | $100 credit, 5GB (+$3/GB), 50k scores (+$1.50/1k), 30-day retention (+$0.50/GB/month) |
| Enterprise | Contact sales | Custom pricing, on-premises or hosted deployment |
Checked on the official pages on 2026-10-14. Prices and features can change, so check the official site again before paying. · Official pricing page
AI tools similar to Braintrust (alternatives)
Braintrust vs. alternatives at a glance
| AI | Pricing | Combos on the map | Connected tools | Free | Cheapest monthly | Korean |
|---|---|---|---|---|---|---|
| Braintrust | Free + paid | 0 | 7 | Yes | $249/mo | No |
| DeepEval | Free + paid | 10 | 7 | — | — | No |
| EleutherAI LM Evaluation Harness | Free + paid | 0 | 7 | — | — | — |
| HumanEval | Free + paid | 0 | 7 | — | — | — |
| LangSmith | Free + paid | 10 | 5 | — | — | — |
1 of these 5 tools have a free plan. Cheapest paid plan: Braintrust ($249/mo).
Combo and connection counts are based on the relationships recorded on AI Galaxy Map (2026-10-26); they are not a quality ranking.
Braintrust on AI Galaxy Map
- One of 27 AI tools in the Observability & Evals field.
- Connected to 7 other tools — #1 in its field.
Frequently asked questions
Can I use Braintrust for free?
Yes (Starter $0: $10 credit, 1GB processed data, 10k scores, 14-day retention, unlimited users). Prices can change, so check the official site before paying.
What AI can I use instead of Braintrust?
Tools that do the same job, such as DeepEval, EleutherAI LM Evaluation Harness, HumanEval, LangSmith, are connected to it on the map.
Can I use Braintrust in Korean?
None (English and a few others only)
Sources (official pages)
Checked on the official pages on 2026-10-14. Prices and features can change, so check the official site again before paying.