Helicone
Open-source LLM observability and gateway.
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About Helicone
Helicone is listed in our evals & observability category and is aimed at builders. Open-source LLM observability and gateway. Pricing, as the maker states it: Open source + paid cloud. Maturity: Mature. We last checked the official link on 2026-10-14.
What is Helicone?
Helicone is an open-source AI gateway and LLM observability platform for AI engineers.
Its gateway gives access to 100+ models with one API key through the OpenAI API, with routing and automatic fallbacks.
Sources: the official README and our directory listing, checked 2026-10-18. Official site: helicone.ai.
Who is Helicone for?
AI engineers who want observability and a model gateway.
Helicone at a glance
- Open source: Yes (Apache License 2.0)
- GitHub: Helicone/helicone · 6,230 stars (as of Oct 21, 2026)
Key features
- AI gateway for 100+ models
- LLM observability
- Routing and fallbacks
Helicone pricing
- Hobby: Free
- Pro: $79/mo
- Team: $799/mo
Discounts for startups (50% off the first year), non-profits, open-source companies and students.
Source: official pricing page, checked Oct 18, 2026. Prices change; check the source before buying.
Helicone FAQ
What is Helicone?
Helicone is an open-source AI gateway and LLM observability platform for AI engineers.
Who is Helicone for?
AI engineers who want observability and a model gateway.
Is Helicone free?
Yes. Helicone has a free option (Hobby), according to its pricing page (checked Oct 18, 2026).
How much does Helicone cost?
As of Oct 18, 2026, Helicone's official pricing page lists: Hobby: Free; Pro: $79/mo; Team: $799/mo. Discounts for startups (50% off the first year), non-profits, open-source companies and students.
Is Helicone open source?
Yes. Helicone is released under the Apache License 2.0, according to its GitHub repository.
What are alternatives to Helicone?
Similar tools include Langfuse, Respan, Laminar, Future AGI, OpenInference and OpenLIT.
Helicone ratings and reviews
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Helicone alternatives
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Respan
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Laminar
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Future AGI
Open-source platform for evaluating, tracing, simulating and guarding LLM and AI agent applications, self-hostable or cloud.
OpenInference
OpenTelemetry-based instrumentation that traces LLM and agent framework calls so any observability backend can show them.
OpenLIT
Open-source platform to trace, evaluate and guard agents and LLM apps.
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