Langfuse vs TensorZero
Which Observability AI tool is better in 2026?
Langfuse
Open source LLM engineering platform for debugging, analyzing, and iterating on LLM applications
TensorZero
Open-source stack for building industrial-grade LLM applications
Side-by-side
Langfuse leads on both fronts — more capital raised ($8M) and a lower entry price than TensorZero.
| Metric | Langfuse | TensorZero |
|---|---|---|
| Taglinei | Open source LLM engineering platform for debugging, analyzing, and iterating on LLM applications | Open-source stack for building industrial-grade LLM applications |
| Foundedi | 2023🏆 | 2024 |
| HQi | DE | New York, US |
| Employeesi | 11-50🏆 | 1-10 |
| Neuron scorei | 34 | 66🏆 |
| Total fundingi | $8M🏆 | $7.3M |
| Latest roundi | Series A · Jul 2024 | Seed · Aug 2025 |
| Valuationi | — | — |
| Cheapest paid plani | From $29/mo🏆 | Pricing not disclosed |
| Free plani | ✓ | ✓ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Free · From $29/mo | Open source |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Langfuse and TensorZero.
| Capability | Langfuse | TensorZero |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | 3 (Python, JavaScript, TypeScript) | — |
| Free plan | ✓ | ✓ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Langfuse
- Has raised more capital ($8M vs $7.3M)
- Lower starting price ($29/mo)
- More mature (2023)
🔵 Strengths of TensorZero
- Higher Neuron score (66 vs 34)
- Newer company (2024)
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 Observability tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Langfuse if you want the most established option — it has raised $8M, 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
Langfuse vs TensorZero — which is better?
It depends on your priority. Langfuse has raised more capital and is the more established option; TensorZero has broader feature depth. See the side-by-side table above.
Is Langfuse cheaper than TensorZero?
Yes — Langfuse's cheapest paid plan is Free · From $29/mo, while TensorZero's is Open source.
Do Langfuse and TensorZero offer free plans?
Langfuse: Yes, has a free plan. TensorZero: Yes, has a free plan.
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