Helicone
4.3
Helicone monitors LLM applications — requests, costs, latency, errors — and acts as a gateway, which lets it cache responses and fail over between providers. It is open source and self-hostable, so prompts and outputs can stay inside your own infrastructure.
- Commercial use OK
- Free tier
- Enterprise contract
- Pricing
- $79/mo
- Free tier
- Free tier
- Commercial use
- Permitted
- Japanese UI
- Not confirmed
- Enterprise contract
- Available
What it is good for
- Seeing what an LLM feature costs per user or per endpoint
- Caching repeated requests to cut spend
- Failing over when a provider has an incident
- Teams that cannot send prompts to a third-party observability vendor
Strengths and trade-offs
Strengths
- Open source and self-hostable
- Gateway position enables caching and fallback, not just logging
- Integration is a base-URL change rather than an SDK rewrite
- Cost attribution per request
Trade-offs
- A gateway in the request path is a new dependency
- Caching needs care — stale answers are worse than slow ones
- Evaluation features are thinner than dedicated tools
Editors' review
Observability that can also lower the bill
Most LLM observability tools watch from the side. Helicone sits in the path, which is what lets it do more than report: identical requests can be served from cache, and a provider outage can route elsewhere without a deploy.
Integration being a base-URL change matters for adoption. Instrumentation projects that require touching every call site tend not to finish.
Being in the path is also the risk. Its availability becomes yours, and caching needs explicit thought about what is safe to reuse. Self-hosting addresses the data question but adds the service to your own operations.
Verdict
Good value when cost and reliability are the concerns. Pair it with a dedicated evaluation tool if quality is.
Compiled from official documentation and public sources, with our own editorial judgement. We do not publish figures we cannot source.