Helicone
Proxy/gateway-based LLM logging with one-line setup, unified cost and latency visibility across providers; now under Mintlify ownership.
| Category | Observability & Tracing |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | freemium |
| Pricing notes | Free tier + per-seat paid plans; reported in maintenance mode after Mintlify acquisition (Mar 2026) |
| Framework integrations | openai-sdk, anthropic, langchain, litellm, vercel-ai |
| Funding / ownership | YC W23; acquired by Mintlify (Mar 2026) |
Pricing/feature source: https://www.helicone.ai/pricing