Braintrust vs LangWatch
Which Evaluation AI tool is better in 2026?
Braintrust
The AI observability platform for building quality AI products at scale.
LangWatch
Platform for LLM evaluations, agent testing and observability
Side-by-side
Braintrust is the more established option (raised $80M); pricing is comparable on both sides.
| Metric | Braintrust | LangWatch |
|---|---|---|
| Taglinei | The AI observability platform for building quality AI products at scale. | Platform for LLM evaluations, agent testing and observability |
| Foundedi | 2023 | 2023 |
| HQi | US | Amsterdam, NL |
| Employeesi | — | 1-10🏆 |
| Neuron scorei | 36 | 60🏆 |
| Total fundingi | $80M🏆 | $1.1M |
| Latest roundi | Series B · Feb 2026 | Pre-Seed · Jan 2024 |
| Valuationi | $800M🏆 | — |
| Cheapest paid plani | — | Pricing not disclosed |
| Free plani | ✗ | ✓ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Enterprise · Contact sales | Pricing not disclosed |
| Pricing summaryi | 1 published plans | Open source |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Braintrust and LangWatch.
| Capability | Braintrust | LangWatch |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✓ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Braintrust
- Has raised more capital ($80M vs $1.1M)
🔵 Strengths of LangWatch
- Higher Neuron score (60 vs 36)
- Offers a free plan
Which should you choose?
Choose LangWatch if price matters most — it starts at Open source, which is friendlier for teams watching burn. Both AI Evaluation tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Braintrust if you want the most established option — it has raised $80M, suggesting more runway for enterprise features, support, and long-term roadmap. For mission-critical workflows or larger teams, that stability often outweighs a lower monthly price.
Frequently asked questions
Braintrust vs LangWatch — which is better?
It depends on your priority. Braintrust has raised more capital and is the more established option; LangWatch has broader feature depth. See the side-by-side table above.
Is Braintrust cheaper than LangWatch?
No — LangWatch's cheapest paid plan is Open source, while Braintrust's is Enterprise · Contact sales.
Do Braintrust and LangWatch offer free plans?
Braintrust: Paid only. LangWatch: Yes, has a free plan.
Explore more AI Evaluation tools
Contextual paths to related AI startups, deals and rankings.