Arize AI vs Langfuse
Which Developer Tools AI tool is better in 2026?
Arize AI
The AI & Agent Engineering Platform for development, observability, and evaluation of LLM applications.
Langfuse
Open source LLM engineering platform for debugging, analyzing, and iterating on LLM applications
Side-by-side
Arize AI is the more established option (raised $132M), but Langfuse is cheaper to start.
| Metric | Arize AI | Langfuse |
|---|---|---|
| Taglinei | The AI & Agent Engineering Platform for development, observability, and evaluation of LLM applications. | Open source LLM engineering platform for debugging, analyzing, and iterating on LLM applications |
| Foundedi | — | 2023🏆 |
| HQi | — | DE |
| Employeesi | — | 11-50🏆 |
| Neuron scorei | 70🏆 | 63 |
| Total fundingi | $132M🏆 | $8M |
| Latest roundi | Series C · Feb 2025 | Seed · Nov 2023 |
| Valuationi | — | — |
| 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 Arize AI and Langfuse.
| Capability | Arize AI | Langfuse |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | 1 (Python) | 3 (Python, JavaScript, TypeScript) |
| Free plan | ✗ | ✓ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Arize AI
- Has raised more capital ($132M vs $8M)
- Higher Neuron score (70 vs 63)
🔵 Strengths of Langfuse
- Offers a free plan
- Lower starting price ($29/mo)
- Newer company (2023)
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 Arize AI if you want the most established option — it has raised $132M, 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
Arize AI vs Langfuse — which is better?
It depends on your priority. Arize AI has raised more capital and is the more established option; Langfuse is cheaper to start. See the side-by-side table above.
Is Arize AI cheaper than Langfuse?
No — Langfuse's cheapest paid plan is Free · From $29/mo, while Arize AI's is Enterprise · Contact sales.
Do Arize AI and Langfuse offer free plans?
Arize AI: Paid only. Langfuse: Yes, has a free plan.
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