Braintrust alternative | LangWatch
Evals aren’t enough. Your agents need to be simulated.
Stop scoring what already happened. Start preventing it.
Braintrust scores what your AI already did. LangWatch simulates what your agent will do, before it ever reaches a real user. That is the difference between chasing problems and preventing them.
Join thousands of AI developers shipping reliable agents with LangWatch.
How LangWatch compares to Braintrust.
Five things teams care about when picking a quality layer for agents. Each row shows what Braintrust ships today and what LangWatch gives you on day one.
| Capability | LangWatch | Braintrust |
|---|---|---|
| 01 | Full agent simulation suite | Not available |
| 02 | Eval library + Strong pre-built evaluators | Auto-evals |
| 03 | Open source + self-hosted | Proprietary SaaS |
| 04 | Engineers + domain experts | Engineers, mostly |
| 05 | Voice-native simulation | Not available |
| 06 | Red teaming, governance, and a gateway | Evals and scoring focused |
Three reasons agent teams choose LangWatch.
Before Prod / After Prod
- Simulate, don’t guess
Thousands of realistic multi-turn conversations against your full agent stack, before a single user interaction.
- Deep agent tracing and debugging
AI-powered Ask finds errors and anomalies for you, across flame charts, span lists, topology and graph views, waterfall traces with a full audit trail, and your own saved lenses.
- A seat for the whole team
Domain experts build scenarios in the UI. PMs review quality. Legal annotates flagged outputs. All without touching code.
“Auto-evals showed us scores. Simulations showed us where the agent would actually break. That is the gap we needed to close before launch.”
VP Engineering· Healthcare AI platform
94% regressions caught pre-prod
5 min time-to-first-eval
any frameworks supported
$0 cost to start
Stop scoring failures. Start preventing them.
LangWatch is free to start. Connect in minutes, any framework, any model. Agent simulation included on day one.