PromptFoo is a prompt testing and evaluation framework built for developers working with large language models like OpenAI, Claude, Cohere, or local LLMs. It allows users to define test cases in YAML, run batch evaluations, compare outputs across models, and score results using metrics like latency, cost, token usage, and semantic relevance. Available via both CLI and browser UI, PromptFoo brings software engineering practices like testing, versioning, and regression checks into prompt workflows—making it essential for teams shipping AI-powered apps.
| PromptFoo Review Summary | |
| Performance Score | A+ |
| Content/Output | Prompt Evaluations, Test Suites, Metrics |
| Interface | CLI + Web UI (Developer-Centric) |
| AI Technology |
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| Purpose of Tool | Test, benchmark, and optimize prompts for LLM-powered apps |
| Compatibility | Web UI + CLI, Supports OpenAI, Claude, Cohere, and local LLMs |
| Pricing | Free & Open Source (Self-hosted) |
Who is Best for Using PromptFoo?
- AI Engineers: Benchmark prompt performance across LLMs for latency, cost, and accuracy.
- ML Ops Teams: Automate testing of AI pipelines with YAML configs and CLI.
- Startup Founders: Ensure consistent AI outputs in product environments.
- QA & DevOps: Bring test-driven development to prompt workflows.
PromptFoo Key Features
| CLI & Web-Based Test Suite | YAML-Based Prompt Testing | Output Comparison & Diffing |
| Multi-Model Evaluation (OpenAI, Claude, etc.) | Scoring by Latency, Cost, Token Usage | Regression & Version Control Support |
| Model Performance Leaderboards | GitHub Integration |
Is PromptFoo Free?
Yes, PromptFoo is fully free and open source. You can self-host it or run it locally via CLI or browser-based UI. There are no paid tiers at the time of writing.
PromptFoo Pricing Plans
- Free & Open Source: Self-hosted or run locally, with no paid tiers.
PromptFoo Pros & Cons
Pros
- Built for developers and technical prompt engineers.
- Powerful evaluation and regression testing tools.
- Fully open source and self-hostable.
- Great for LLM model comparisons and benchmarking.
Cons
- Not suited for casual or no-code users.
- Requires CLI or YAML knowledge for full use.
- Focuses on testing—not prompt generation or management.
FAQs
Is PromptFoo beginner-friendly?
No, it’s designed for developers familiar with CLI tools, YAML, and LLM pipelines.
What models does PromptFoo support?
PromptFoo supports OpenAI, Anthropic’s Claude, Cohere, Azure OpenAI, and local LLMs via API.
Can I integrate PromptFoo into my CI/CD pipeline?
Yes, its CLI and YAML config make it ideal for test automation and model evaluation in dev environments.
