Braintrust alternatives
Braintrust is aI observability and evals platform for tracing agents, running experiments and scoring outputs. If it is not the right fit on price, features or setup, these 10 tools do a similar job. We rank them by how closely they match Braintrust, and every listing is checked against its official site.
Compare Braintrust and its alternatives
| Tool | Best for | Pricing | Starts at | MCP server |
|---|---|---|---|---|
| Braintrustcurrent | AI product teams running evals on agents in production | Free plan | Free Starter plan, Pro $249/month, Enterprise custom (as of October 2026) | Official |
| Arize AI | Teams monitoring and evaluating LLM agents in production | Free plan | Free AX plan, AX Pro $50/month, Enterprise custom (as of October 2026) | Not checked |
| Langfuse | Engineering teams tracing and evaluating LLM apps | Open source | Free Hobby cloud plan and free self-hosting, Core from $29/month, Pro $199/month (as of October 2026) | Official |
| Promptfoo | Developer and security teams red teaming LLM apps in CI | Open source | Free open-source Community plan with 10k red team probes/month, Enterprise and On-Premise priced on request (as of October 2026) | Not checked |
| Amazon Bedrock Guardrails | Teams building AI apps on AWS that need central safety policies | Paid | See site | Not checked |
| Azure AI Content Safety | Teams on Azure and Microsoft Foundry moderating AI input and output | Free plan | See site | Not checked |
| LangChain | Engineering teams building and monitoring LLM agents | Open source | Framework free; LangSmith Developer free, Plus $39/seat/month plus usage (as of October 2026) | Not checked |
| Cursor | Engineering teams adopting agent-assisted coding | Free plan | Free Hobby plan, paid from $20/month (Individual), Teams $40/user/month (as of October 2026) | Not checked |
| NeMo Guardrails | Engineering teams that want self-hosted, code-level control over LLM guardrails | Open source | See site | Not checked |
| Pydantic AI | Python teams building production agents | Open source | See site | Not checked |
| Sentry | Engineering teams monitoring production apps | Free plan | Free developer plan, Team from $26/month billed annually | Official |
The alternatives
1. Arize AI
Agent observability and evaluation platform, with the open-source Phoenix for tracing and evals.
Pricing: Free plan, from Free AX plan, AX Pro $50/month, Enterprise custom (as of October 2026) · Best for: teams monitoring and evaluating LLM agents in production · Also covers: ai safety, evaluation, llm observability
2. Langfuse
Open-source LLM engineering platform for tracing, prompt management and evaluations.
Pricing: Open source, from Free Hobby cloud plan and free self-hosting, Core from $29/month, Pro $199/month (as of October 2026) · Best for: engineering teams tracing and evaluating LLM apps · Also covers: ai safety, evaluation, llm observability
3. Promptfoo
Open-source CLI and platform for red teaming, scanning and evaluating LLM apps and agents.
Pricing: Open source, from Free open-source Community plan with 10k red team probes/month, Enterprise and On-Premise priced on request (as of October 2026) · Best for: developer and security teams red teaming LLM apps in CI · Also covers: ai safety, evaluation
4. Amazon Bedrock Guardrails
Configurable safety filters for generative AI apps on AWS, usable with any model via the ApplyGuardrail API.
Pricing: Paid · Best for: teams building AI apps on AWS that need central safety policies · Also covers: ai safety
5. Azure AI Content Safety
Microsoft's API for detecting harmful content, prompt attacks and ungrounded output in AI apps.
Pricing: Free plan · Best for: teams on Azure and Microsoft Foundry moderating AI input and output · Also covers: ai safety
6. LangChain
Open-source framework for building LLM apps, with the LangSmith platform for monitoring and deployment.
Pricing: Open source, from Framework free; LangSmith Developer free, Plus $39/seat/month plus usage (as of October 2026) · Best for: engineering teams building and monitoring LLM agents
7. Cursor
AI code editor with coding agents, built by Anysphere.
Pricing: Free plan, from Free Hobby plan, paid from $20/month (Individual), Teams $40/user/month (as of October 2026) · Best for: engineering teams adopting agent-assisted coding
8. NeMo Guardrails
NVIDIA's open-source toolkit for adding programmable input, dialog, retrieval and output rails to LLM apps.
Pricing: Open source · Best for: engineering teams that want self-hosted, code-level control over LLM guardrails
9. Pydantic AI
Typed Python framework for building AI agents across many model providers.
Pricing: Open source · Best for: python teams building production agents
10. Sentry
Error monitoring and performance tracing for software teams.
Pricing: Free plan, from Free developer plan, Team from $26/month billed annually · Best for: engineering teams monitoring production apps
Frequently asked questions
What is the best alternative to Braintrust?+
Arize AI, Langfuse and Promptfoo are the closest matches in our directory. Arize AI: Agent observability and evaluation platform, with the open-source Phoenix for tracing and evals.
Is there a free alternative to Braintrust?+
Arize AI, Langfuse, Promptfoo and Azure AI Content Safety have a free plan or are open source. Free plans usually cap usage or features.
Is there an open-source alternative to Braintrust?+
Yes: Langfuse, Promptfoo and LangChain.
What is Braintrust?+
AI observability and evals platform for tracing agents, running experiments and scoring outputs.
More alternatives