Promptfoo vs OpenRouter
A side-by-side comparison to help you choose the right tool.
88
Promptfoo scores higher overall (88/100)
But the best choice depends on your specific needs. Compare below.
| Feature | Promptfoo | OpenRouter |
|---|---|---|
| Our score | 88 | 84 |
| Pricing | Open-source core; free to run in your own workflows. | Prepaid credits at provider rates with a 5.5% purchase fee. Free models available with rate limits. No subscription required. |
| Free plan | Yes | Yes |
| Best for | Teams serious about AI testing discipline, Developers comparing prompts and providers, Organizations building evals into release workflows | Developers building apps who want to avoid vendor lock-in to a single LLM provider, Teams experimenting across multiple models with a single billing account, Indie developers and startups that want access to many models without separate provider contracts |
| Platforms | mac, windows, linux, api | web, api |
| API | Yes | Yes |
| Languages | en | en |
| Pros |
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| Cons |
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| Visit site | Get started |
- Pricing
- Open-source core; free to run in your own workflows.
- Free plan
- Yes
- Best for
- Teams serious about AI testing discipline, Developers comparing prompts and providers, Organizations building evals into release workflows
- Platforms
- mac, windows, linux, api
- API
- Yes
- Languages
- en
- Pricing
- Prepaid credits at provider rates with a 5.5% purchase fee. Free models available with rate limits. No subscription required.
- Free plan
- Yes
- Best for
- Developers building apps who want to avoid vendor lock-in to a single LLM provider, Teams experimenting across multiple models with a single billing account, Indie developers and startups that want access to many models without separate provider contracts
- Platforms
- web, api
- API
- Yes
- Languages
- en
88Choose Promptfoo if:
- You are Teams serious about AI testing discipline
- You are Developers comparing prompts and providers
- You are Organizations building evals into release workflows
- You want to start free
84Choose OpenRouter if:
- You are Developers building apps who want to avoid vendor lock-in to a single LLM provider
- You are Teams experimenting across multiple models with a single billing account
- You are Indie developers and startups that want access to many models without separate provider contracts
- You want to start free
FAQ
- What is the difference between Promptfoo and OpenRouter?
- Promptfoo is an open-source testing and evaluation framework for prompts and models, designed to fit into ci/cd and comparison workflows. OpenRouter is unified api gateway giving access to 300+ language models across 60+ providers including gpt, claude, gemini, and llama, with automatic fallbacks, smart provider routing, and cost optimization.
- Which is cheaper, Promptfoo or OpenRouter?
- Promptfoo: Open-source core; free to run in your own workflows.. OpenRouter: Prepaid credits at provider rates with a 5.5% purchase fee. Free models available with rate limits. No subscription required.. Promptfoo has a free plan. OpenRouter has a free plan.
- Who is Promptfoo best for?
- Promptfoo is best for Teams serious about AI testing discipline, Developers comparing prompts and providers, Organizations building evals into release workflows.
- Who is OpenRouter best for?
- OpenRouter is best for Developers building apps who want to avoid vendor lock-in to a single LLM provider, Teams experimenting across multiple models with a single billing account, Indie developers and startups that want access to many models without separate provider contracts.