Braintrust vs Langfuse
Which Developer Tools AI tool is better in 2026?
Braintrust
The AI observability platform for building quality AI products at scale.
Langfuse
Open source LLM engineering platform for debugging, analyzing, and iterating on LLM applications
Side-by-side
Braintrust is the more established option (raised $80M), but Langfuse is cheaper to start.
| Metric | Braintrust | Langfuse |
|---|---|---|
| Taglinei | The AI observability platform for building quality AI products at scale. | Open source LLM engineering platform for debugging, analyzing, and iterating on LLM applications |
| Foundedi | 2023 | 2023 |
| HQi | US | DE |
| Employeesi | — | 11-50🏆 |
| Neuron scorei | 68🏆 | 63 |
| Total fundingi | $80M🏆 | $8M |
| Latest roundi | Series B · Feb 2026 | Seed · Nov 2023 |
| Valuationi | $800M🏆 | — |
| Cheapest paid plani | — | From $29/mo🏆 |
| Free plani | ✗ | ✓ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Enterprise · Contact sales | Pricing not disclosed |
| Pricing summaryi | 1 published plans | Free · From $29/mo |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Braintrust and Langfuse.
| Capability | Braintrust | Langfuse |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | 3 (Python, JavaScript, TypeScript) |
| Free plan | ✗ | ✓ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Braintrust
- Has raised more capital ($80M vs $8M)
- Higher Neuron score (68 vs 63)
🔵 Strengths of Langfuse
- Offers a free plan
- Lower starting price ($29/mo)
Which should you choose?
Choose Langfuse if price matters most — it starts at Free · From $29/mo, which is friendlier for teams watching burn. Both AI Developer Tools 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 Langfuse — which is better?
It depends on your priority. Braintrust has raised more capital and is the more established option; Langfuse is cheaper to start. See the side-by-side table above.
Is Braintrust cheaper than Langfuse?
No — Langfuse's cheapest paid plan is Free · From $29/mo, while Braintrust's is Enterprise · Contact sales.
Do Braintrust and Langfuse offer free plans?
Braintrust: Paid only. Langfuse: Yes, has a free plan.
Explore more AI Developer Tools tools
Contextual paths to related AI startups, deals and rankings.