Braintrust alternatives for teams shipping AI agents
Last checked 31 Oct 2026
Short answer: the closest alternatives to Braintrust for tracing and evals are LangSmith, Langfuse and Arize Phoenix. Agentiqa is not a drop-in replacement for Braintrust: it runs an agent's key tasks before each release and checks the records it wrote. Which one fits depends on the job you need done.
Start with the job
People look for a Braintrust alternative for different reasons: they want open source and self-hosting, a different pricing model, tighter fit with their agent framework, or a check that the agent wrote the right records before a release. Those are different jobs, and no single tool on this page does all of them.
- See what the agent did in production: observability platforms.
- Score outputs on a dataset: eval tools.
- Check that the next version writes the right records: release gates.
The alternatives
1. LangSmith
LangSmith, from LangChain, traces agents step by step and runs offline evals on curated datasets and online evals on production traffic. Developer plan $0 for one seat; Plus $39 per seat a month.
Pick it if you build on LangChain or LangGraph, or want offline and online evals plus monitoring. Agentiqa vs LangSmith
2. Langfuse
Langfuse is "Open Source Agent Evals & Observability": tracing, evals, prompt management and datasets, self-hosted under MIT or in its cloud. Hobby plan free, no credit card.
Pick it if you want open source tracing and evals you can self-host, with prompt management. Agentiqa vs Langfuse
3. Arize Phoenix
Arize Phoenix is "open-source AI observability & evaluation" built on OpenTelemetry, run locally or self-hosted, under the Elastic License 2.0. Arize AX is the hosted version, with a free tier.
Pick it if you want open source tracing and evals on OpenTelemetry that run on your own machine. Agentiqa vs Arize Phoenix
4. Agentiqa
Agentiqa is an AI Quality System for agents that write data into business systems. Release gates run the agent's key tasks before each release in a real browser with a test account and check what changed in the connected system. AI Quality Manager compares each release with the previous one and proposes test updates, which a person approves. Agentiqa does not trace production. Community Edition is free: 20 runs a month, no credit card.
Pick it if your agent creates or changes records for customers, in ERP and procurement suites, CRM or billing, and you want each release checked on its key tasks before it ships. It works next to Braintrust, not instead of it. Agentiqa vs Braintrust
At a glance
| Tool | Main job | Free option | Where it runs |
|---|---|---|---|
| Braintrust | Observability and evals | Starter $0 | Enterprise: on-prem or hosted |
| LangSmith | Tracing, offline and online evals | Developer $0, 1 seat | SmithDB in your VPC |
| Langfuse | Open source tracing, evals, prompts | Hobby, free | Self-hosted (MIT) or cloud |
| Arize Phoenix | Open source tracing and evals | Phoenix local; AX Free $0 | Phoenix local or self-hosted; AX hosted |
| Agentiqa | Release gates on key tasks, records checked | Community Edition, 20 runs a month | Cloud, Desktop app or CLI |
Facts about other products come from their own pages, checked on 31 Oct 2026. Sources below.
FAQ
It depends on why you are switching. For open source tracing and evals you can self-host, look at Langfuse or Arize Phoenix. For checking that an agent writes the right records before each release, Agentiqa.
Yes. Langfuse and Arize Phoenix can be self-hosted, and LangSmith has a free Developer plan. Agentiqa Community Edition is free for web apps and simple agentic workflows, with 20 runs a month.
No. Agentiqa does not trace production or manage prompts. It runs an agent's key tasks before each release and checks what changed in the connected system. You can run it next to Braintrust.
Agents that write data into business systems, where a wrong value, a false "done" or a duplicate record costs money. Agentiqa is not designed for agents that only answer questions or generate text.
Sources
Braintrust: braintrust.dev, pricing; LangSmith: observability, evaluation, pricing; Langfuse: langfuse.com, pricing; Arize Phoenix: arize.com/phoenix, GitHub, pricing. All checked 31 Oct 2026. Agentiqa: agentiqa.com, Enterprise, Community Edition.
Try it on your own agent
Describe a task in plain words. Agentiqa does it step by step and tells you if it worked. Every failure comes with step-by-step reproduction.
20 runs a month, no credit card.
Your agent writes into ERP, CRM or billing for customers? See Enterprise.