HeliconeUnified gateway to monitor, debug, and optimize LLM applications across providers.

4.8 (5)

Reviewed by Daniel Nikulshyn·Updated May 2026

LLM Observability Developer Tools API Gateway Open Source Analytics Prompt Management Monitoring

Overview

Helicone is an observability and gateway platform built for teams developing with large language models. It sits between your application and AI providers, capturing requests, responses, latency, costs, and errors so developers can debug prompts and track performance from a single dashboard. Beyond logging, Helicone offers tools for prompt management, A/B testing, caching, rate limiting, and user-level analytics. Its provider-agnostic gateway lets teams route traffic across models from OpenAI, Anthropic, and others, making it easier to experiment, control spend, and ship reliable AI features.

Key features

Request and response logging
Prompt versioning and experiments
Caching and rate limiting
Cost tracking per user or session
Multi-provider gateway routing
Custom alerts and dashboards

Pricing

Model: $20
Category: AI Infrastructure & MLOps
Rating: 4.8 / 5 (5)

Use cases

Debug production LLM issues

Inspect logged requests, responses, latency, and errors in a single dashboard to quickly diagnose failing prompts or degraded model behavior in live applications.

Control and forecast AI spend

Track costs per user, session, or feature to identify expensive workloads, enforce rate limits, and use caching to reduce redundant calls to LLM providers.

A/B test prompts and models

Use prompt versioning and experiments alongside multi-provider routing to compare outputs from OpenAI, Anthropic, and others before rolling changes to users.

Route traffic across providers

Leverage the unified gateway to switch or balance requests between LLM vendors, improving reliability and avoiding lock-in for AI-powered features.

Pros & Cons

Pros

Works across multiple LLM providers
Detailed cost and usage analytics
Simple proxy-based integration
Open-source option available

Cons

Adds an external dependency to request path
Advanced features require paid tiers
Learning curve for full feature set

Reviews

4.8

Average from 5 ratings.

Fatima Zahra

May 24, 2026

Compared a few options

Evaluated this against two competitors. Where it wins: caching and rate limiting and detailed cost and usage analytics. On balance the feature set — especially prompt versioning and experiments — justifies the 5 stars for our use case.

Victor Nguyen

May 22, 2026

Use it every day

Honestly didn't expect to like it this much. Caching and rate limiting is exactly what I needed, and works across multiple LLM providers. I do wish adds an external dependency to request path, but I reach for it almost every day now and it just clicks.

Naomi Suzuki

Oct 2, 2025

Does the job

Pretty happy overall. Custom alerts and dashboards just works and simple proxy-based integration. but no dealbreakers — I'd recommend it to a friend without hesitating.

Leila Hassan

Sep 18, 2025

Does the job

Pretty happy overall. Caching and rate limiting just works and works across multiple LLM providers. but no dealbreakers — I'd recommend it to a friend without hesitating.

Gunnar Eriksson

Sep 5, 2025

Does the job

Pretty happy overall. Prompt versioning and experiments just works and open-source option available. Adds an external dependency to request path can be annoying, but no dealbreakers — I'd recommend it to a friend without hesitating.

Q&A

Are advanced features like A/B testing and custom alerts available on the free trial?

Helicone offers a 7‑day free trial with no credit card required, but advanced capabilities such as prompt versioning, A/B testing, and custom alerts are part of its paid tiers.

Asked by Isabela Almeida · Mar 25, 2026

What provider support and routing flexibility does Helicone offer?

Helicone is provider‑agnostic; it can route traffic to multiple LLM providers such as OpenAI and Anthropic. You can configure routing rules to experiment with different models or fall back to alternatives without changing application code.

Asked by Zelda Brandt · Feb 20, 2026

Can I track costs and usage per individual user or session?

Yes, Helicone provides cost tracking and analytics at the user or session level, allowing you to monitor spend and performance metrics for each end‑user directly from the dashboard.

Asked by Petros Georgiou · Feb 16, 2026

How does Helicone integrate with my existing LLM codebase?

Helicone works as a proxy gateway; you point your API calls to its endpoint instead of directly to OpenAI, Anthropic, etc. The platform then forwards requests, captures logs, and returns responses, requiring only a URL change and your API key.

Asked by Mia Andersen · Jan 29, 2026