The best Braintrust alternatives

8 tools that do a similar job to Braintrust, 4 of them open source. Each entry says what it does and who it suits, so you can pick the one that fits instead of the most famous.

You're replacing

Braintrust

An evaluation and observability platform for scoring prompts and models against datasets and monitoring production.

1. 1

   promptfoo

   Open source · MIT · ★ 26.7k

   CLI and library for testing LLM prompts and red-teaming AI apps, with declarative configs.

   Best for: Developers building apps on top of LLM APIs who want repeatable prompt tests; Teams comparing several models side by side on the same prompts

   Full review Braintrust vs promptfoo
2. 2

   Helicone

   AI tool · Freemium

   An open-source LLM observability proxy that logs requests, costs and latency with a one-line integration.

   Best for: Quick cost and usage visibility; Caching and rate limiting LLM calls

   Full review Braintrust vs Helicone
3. 3

   W&B Weave

   AI tool · Freemium

   Weights & Biases' toolkit for tracing, evaluating and comparing LLM application versions.

   Best for: Teams already on Weights & Biases; Evaluation leaderboards across versions

   Full review Braintrust vs W&B Weave
4. 4

   Langfuse

   AI tool · Open source

   An open-source LLM engineering platform for tracing, prompt management, evaluations and cost tracking.

   Best for: Tracing LLM apps in production; Self-hosted prompt management

   Full review Braintrust vs Langfuse
5. 5

   Arize Phoenix

   AI tool · Open source

   An open-source tool for tracing, evaluating and experimenting with LLM and agent applications, built on OpenTelemetry.

   Best for: Local debugging of LLM traces; OpenTelemetry-based stacks

   Full review Braintrust vs Arize Phoenix
6. 6

   LangSmith

   AI tool · Freemium

   LangChain's platform for tracing, evaluating and monitoring LLM apps, with a prompt hub and playground.

   Best for: LangChain and LangGraph users; Dataset-based evaluation

   Full review Braintrust vs LangSmith
7. 7

   Opik

   AI tool · Open source

   Comet's open-source platform for logging, evaluating and monitoring LLM apps, including prompt optimisation.

   Best for: Open-source tracing and evals; Automated prompt optimisation

   Full review Braintrust vs Opik
8. 8

   Confident AI (DeepEval)

   AI tool · Freemium

   The cloud platform behind DeepEval, an open-source framework for unit-testing LLM outputs with ready-made metrics.

   Best for: Pytest-style LLM tests; RAG evaluation metrics

   Full review

How we pick: tools in the same category that solve the same problem, projects that name each other as alternatives, and open-source projects that describe themselves as an alternative to Braintrust. We don't take payment for placement.