Helicone vs W&B Weave
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
AI tool · Freemium
An open-source LLM observability proxy that logs requests, costs and latency with a one-line integration.
AI tool · Freemium
Weights & Biases' toolkit for tracing, evaluating and comparing LLM application versions.
The short answer
Choose Helicone if you need…
- Quick cost and usage visibility
- Caching and rate limiting LLM calls
Choose W&B Weave if you need…
- Teams already on Weights & Biases
- Evaluation leaderboards across versions
Side-by-side
| Helicone | W&B Weave | |
|---|---|---|
| Type | Prompting · Evaluation & observability | Prompting · Evaluation & observability |
| Price | Freemium | Freemium |
| Platforms | Web, API, Self-hosted | Web, API |
| Works with | OpenAI, Anthropic | OpenAI, Anthropic |
| Hands-on tested by us | Not yet | Not yet |
| Last checked | 2026-10-29 | 2026-10-29 |
What each one is
Helicone
An open-source LLM observability proxy that logs requests, costs and latency with a one-line integration. Very easy to adopt. A proxy sits in your request path, so check reliability and data handling.
W&B Weave
Weights & Biases' toolkit for tracing, evaluating and comparing LLM application versions. Natural fit for ML teams using W&B. Feels heavier than lighter-weight tools for small projects.
Best for
Helicone
- Quick cost and usage visibility
- Caching and rate limiting LLM calls
W&B Weave
- Teams already on Weights & Biases
- Evaluation leaderboards across versions
Strengths
Helicone
- Proxy-based request logging
- Cost tracking
- Caching
- Prompt versioning
W&B Weave
- Automatic call tracing
- Evaluation framework
- Version comparison
- Scorers and guardrails
Frequently asked questions
What is the difference between Helicone and W&B Weave?
Helicone: An open-source LLM observability proxy that logs requests, costs and latency with a one-line integration. W&B Weave: Weights & Biases' toolkit for tracing, evaluating and comparing LLM application versions. Helicone suits quick cost and usage visibility, while W&B Weave suits teams already on weights & biases.
Are Helicone and W&B Weave free?
Helicone: Freemium. W&B Weave: Freemium.
What are other alternatives to Helicone and W&B Weave?
Other options people compare them with include promptfoo, Braintrust, Langfuse, Arize Phoenix, LangSmith.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.