Helicone
AI gateway and observability tool, Apache 2.0 licensed: requests to OpenAI, Anthropic, Gemini and others go through Helicone, which records them (cost, latency, agent sessions), handles routing and fallback models, and versions prompts. Mintlify acquired it on March 3, 2026 and put it in maintenance mode: security patches, bug fixes and new models, nothing more, with customers helped toward another platform. As of November 12, 2026, the site announces that Helicone is now part of Experiential Labs, details to come.
Best for
- Taking over a project that already goes through Helicone, while you prepare its migration