Answer.AI vs Langfuse
Which Developer Tools AI tool is better in 2026?
Answer.AI
Jeremy Howard and Eric Ries' open R&D lab behind ModernBERT and FastHTML
Langfuse
Open source LLM engineering platform for debugging, analyzing, and iterating on LLM applications
Side-by-side
Answer.AI is the more established option (raised $10M), but Langfuse is cheaper to start.
| Metric | Answer.AI | Langfuse |
|---|---|---|
| Taglinei | Jeremy Howard and Eric Ries' open R&D lab behind ModernBERT and FastHTML | Open source LLM engineering platform for debugging, analyzing, and iterating on LLM applications |
| Foundedi | 2023 | 2023 |
| HQi | United States | DE |
| Employeesi | — | 11-50🏆 |
| Neuron scorei | 70🏆 | 52 |
| Total fundingi | $10M🏆 | $8M |
| Latest roundi | Seed · Dec 2023 | Seed · Nov 2023 |
| Valuationi | — | — |
| Cheapest paid plani | Pricing not disclosed | From $29/mo🏆 |
| Free plani | ✓ | ✓ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Free | Free · From $29/mo |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Answer.AI and Langfuse.
| Capability | Answer.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 Answer.AI
- Has raised more capital ($10M vs $8M)
- Higher Neuron score (70 vs 52)
🔵 Strengths of Langfuse
- 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 Answer.AI if you want the most established option — it has raised $10M, 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
Answer.AI vs Langfuse — which is better?
It depends on your priority. Answer.AI has raised more capital and is the more established option; Langfuse is cheaper to start. See the side-by-side table above.
Is Answer.AI cheaper than Langfuse?
No — Langfuse's cheapest paid plan is Free · From $29/mo, while Answer.AI's is Free.
Do Answer.AI and Langfuse offer free plans?
Answer.AI: Yes, has a free plan. Langfuse: Yes, has a free plan.
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