Helicone
Open-source AI gateway to route, debug, and monitor LLM requests across 100+ models
Data verified Sep 18, 2026
Score
- Try it free
- Free plan
- Best for
- AI Application Developers
About Helicone
Helicone is an open-source, self-hostable AI gateway and LLM observability platform that gives developers a single OpenAI-compatible API to reach 100+ model providers with request routing, caching, rate limiting, and cost analytics. It's aimed at engineering teams and AI startups that need low-friction cost tracking and request logging — you change a base URL to start logging — rather than deep agent-workflow debugging. Its main differentiator is being an open-source, self-hostable gateway that unifies multi-provider access at 0% markup while doubling as an observability layer.
Screenshots
Commonly Cited Strengths & Limitations
Strengths
- Lowest-friction setup — start logging with just a base URL change
- Accurate cost and token tracking across 100+ models
- Caching can reduce API costs meaningfully (~20-30%)
- Open-source and self-hostable
Limitations
- Proxy-based architecture adds roughly 50-80ms of latency per request
- Limited evaluation capabilities (manual scoring only, no auto-generated evals)
- No issue tracking or lifecycle management for failed/bad requests
- Weak support for deep debugging of complex multi-turn agent workflows
- Only 7-day data retention on the free tier
- Significant price jump from free to Pro
- Now in maintenance mode after Mintlify acquisition — no new features
Common Use Cases
- Streamlining multi-LLM API integration and cost management
- Improving AI application reliability and performance with failover and caching
- Debugging and optimizing prompt engineering with full observability
- Deploying secure, compliant self-hosted AI gateways
Details
- Pricing Model
- Freemium
- Team Size
- Small Business, Enterprise
- Category
- Developer Tools
Who is Helicone for?
AI Application Developers
Integrate 100+ models through one OpenAI-compatible API and start logging requests with just a base-URL change.
Engineering & Platform Teams
Track token usage and costs, set rate limits, and cache responses to control LLM spend in production.
Prompt Engineers
Iterate on prompts in the playground and manage reusable prompt templates with variable substitution.
Frequently Asked Questions
Is Helicone free?
Helicone offers a free plan.
Does Helicone offer a free trial?
Yes, Helicone offers a free trial of 7 days.
Does Helicone have an API?
Yes, Helicone provides an API for developers.
Is Helicone open source?
Yes, Helicone is open source.
What does Helicone integrate with?
Helicone integrates with OpenAI, Anthropic, Azure, Anyscale, Together AI, Google, LiteLLM, OpenRouter.
Is Helicone cloud-based or self-hosted?
Helicone is offered as both cloud and self-hosted (hybrid) deployment.
What are the downsides of Helicone?
Proxy-based architecture adds roughly 50-80ms of latency per request Also, Limited evaluation capabilities (manual scoring only, no auto-generated evals)
Who is Helicone best for?
Helicone is best suited for AI Application Developers, Engineering & Platform Teams, Prompt Engineers.
What can I use Helicone for?
Common uses for Helicone include streamlining multi-llm api integration and cost management, improving ai application reliability and performance with failover and caching, debugging and optimizing prompt engineering with full observability, deploying secure, compliant self-hosted ai gateways.
What is the best alternative to Helicone?
Our reviewed alternatives to Helicone are Langfuse, LangSmith and LiteLLM.
How does Helicone compare to JotURL?
Helicone and JotURL are both used for developer tools -- specifically analytics & bi tools. See the full side-by-side comparison for pricing and feature differences.
Key Features
- Universal Model AccessConnect to 100+ LLM models through a single unified API with 0% markup fees.
- Intelligent Request RoutingRoutes and scales LLM requests to optimize performance and reliability.
- Comprehensive DebuggingDetailed request logs and tracing to identify and resolve issues in LLM apps.
- Performance Analytics DashboardCustom dashboards showing usage, user behavior, and LLM performance metrics.
- Custom Alerts & MonitoringReal-time notifications for events like rate limit breaches or unusual request patterns.
- Prompt Improvement ToolsStructured workflows to iterate and refine prompts for better output quality.
- Interactive PlaygroundExperiment with prompts and models in real time to test and optimize responses.
- Dataset ManagementOrganize datasets for prompt testing and LLM fine-tuning.
- Load Balancing & FailoverLatency and health-based routing with automatic failover for high uptime.
- Semantic CachingSimilarity-based response caching with configurable durations to cut cost and latency.
- Rate LimitingSupports per-user, per-session, and custom rate limits.
- Prompt ManagementManage and reuse prompt templates with dynamic variable substitution via the gateway.
- Self-Hosting & Cloud OptionsDeploy fully self-hosted for control or use the cloud-hosted AI gateway.
Integrations
Technical Details
- Deployment
- Hybrid
- Target Market
- B2B
- API
- Available
- Free Trial
- 7 days
- Free Plan
- Available
Security & Compliance
Real Pricing from Verified Users
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Helicone alternatives we reviewed
Reviewed when this listing was published; open-source options are marked.
Langfuse
Popular open-source, SDK-based LLM observability platform with zero added latency to LLM calls.
LangSmith
LLM observability and evaluation platform with deeper agent tracing and eval depth.
LiteLLM
Open-source proxy/SDK for unified access to many LLM providers via one API.
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