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.
Performance Score
A+
Content/Output
Prompt Evaluations, Test Suites, Metrics
Interface
CLI + Web UI (Developer-Centric)
AI Technology
- Multi-Model Testing
- Output Scoring Engine
- Prompt Diff Tools
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.
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
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.
Not suited for casual or no-code users.
Requires CLI or YAML knowledge for full use.
Focuses on testing�not prompt generation or management.
