Helicone
Helicone is a quick way to get request logs, cost tracking and caching on top of LLM calls with a one-line base-URL change, and the open-source code means you can run it yourself. Its ownership has changed twice in 2026 and the public changelog has been quiet since late 2025, so teams choosing a long-term observability platform should weigh that against more actively developed options.
Pros
- Proxy or gateway integration takes one line of configuration
- Free tier with 10,000 requests a month and an open-source self-host option
- Built-in caching, rate limits and automatic provider fallbacks
- Session view for multi-step agent traces and HQL for custom queries
Cons
- Free plan keeps data for only 7 days and Pro for one month
- Usage-based charges on top of the plan fee make bills harder to predict
- Ownership uncertainty: acquired by Mintlify in March 2026, then announced as separated again with no details