Helicone
Open-source LLM observability platform for logging, monitoring and debugging LLM API calls -- now in maintenance mode after Helicone's acquisition by Mintlify; new customers are directed to migrate rather than adopt it.
Hobby free tier (10,000 requests/month, 1 GB storage, 1 seat, 7-day retention); Pro $79/month; Team $799/month; Enterprise contact-sales; Pro and Team carry a 7-day free trial and usage-based overage above the included allowances. Prices unchanged since 2026-08-31. The pricing page now carries the same 'Helicone Joins Mintlify' banner as the rest of the site.
What it does
- Evaluation and observability
How it compares
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Langfuse
Helicone and Langfuse are top open-source tools that help developers monitor, analyze, and optimize their LLM-powered applications.
Official documentation · 19 Sep 2026
Sources
- Pricing
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Official documentation · 31 Aug 2026
Pricing page lists Hobby (free, 10,000 requests/1GB storage), Pro ($79/month), Team ($799/month), Enterprise (contact-sales). No mention of maintenance mode or wind-down on this specific page.
- Sold within
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Helicone's pricing page offers "Hobby" ("Free", "10,000 free requests", "Get started for free") and paid plans from "$79". The site carries "Helicone Joins Mintlify"; the announcement says "Helicone's services will remain live for the foreseeable future in maintenance mode."
Also from Helicone
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Helicone AI Gateway API service
OpenAI-compatible unified API routing to 100+ models (OpenAI, Anthropic, Vertex, Groq and more) through Helicone's platform.
Open Helicone in the directory
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