September 28, 2023


Rapidly improve prompts and evaluate LLM models

Best for:

  • Developers
  • Data Scientists
  • AI Researchers

Use cases:

  • Optimizing LLM prompts
  • Evaluating multiple LLM models
  • Improving LLM accuracy and performance

Users like:

  • AI Development
  • Research and Development
  • IT

What is promptfoo?

Quick Introduction

promptfoo is a robust platform designed for developers and data scientists to optimize and evaluate their Language Learning Models (LLMs) for superior performance. This tool facilitates the rapid improvement of prompts and the evaluation of various models. With promptfoo, you can iteratively fine-tune LLMs, measure their quality, and catch regressions effortlessly. It’s perfect for anyone working extensively with natural language processing, machine learning, or artificial intelligence, seeking to streamline the process of prompt crafting and model evaluation.

Developers can create test datasets using representative samples of user inputs to ensure the accuracy and relevance of the prompts. promptfoo offers detailed, actionable results, helping users make informed decisions about their LLMs. Additionally, you can use built-in metrics, LLM-graded evaluations, or define your own custom metrics to achieve precise evaluations. The platform supports various integrations, making it easy to incorporate it into your existing test or CI workflow.

Pros and Cons


  1. User-Friendly Interface: The intuitive interface of promptfoo makes it easy for users to navigate and perform tasks efficiently.
  2. Custom Metrics Support: Allows users to define their own metrics for evaluation, accommodating specific needs and requirements.
  3. Wide Compatibility: Supports a range of popular LLM providers, including OpenAI, Anthropic, and Mistral, offering flexibility in model selection.


  1. Learning Curve: Initial setup and understanding of the full capabilities might require a steep learning curve for new users.
  2. Resource Intensive: Running evaluations and tests can be resource-intensive and might require substantial computational power.
  3. Cost: Depending on usage, the implementation of promptfoo may incur significant costs, particularly for extensive, ongoing evaluations.


  • Provides tools to rapidly iterate on and improve prompts.
  • Measures LLM quality with customizable and built-in evaluation metrics.
  • Supports side-by-side comparison of various LLM models and prompts.

Features and Functionality

  • Test Dataset Creation: Allows users to create datasets using representative samples of user inputs, reducing subjectivity in prompt tuning.
  • Custom Metrics: Users can define their own custom evaluation metrics or use built-in ones, ensuring precise and relevant evaluations.
  • Side-by-Side Comparison: Compare different prompts and model outputs side-by-side to determine the best-performing ones.
  • Declarative Configuration: Utilizes a simple, declarative configuration for setting up evaluations, making the process straightforward.
  • Web Viewer & Command Line: Offers flexible usage through a web viewer and command line interface, accommodating different user preferences.

Integration and Compatibility

promptfoo integrates with several popular LLM providers, including OpenAI, Anthropic, and Mistral. This flexibility allows users to choose from a variety of models to evaluate and improve their prompts.

Do you use promptfoo?

It can be seamlessly integrated into existing CI workflows, providing a streamlined process for regular testing and evaluation. The tool supports both a web viewer and command line, catering to different user working styles. If no integration is required, promptfoo stands independently as a comprehensive platform for LLM evaluation and optimization.

Benefits and Advantages

  • Improves Accuracy: By allowing precise tuning and evaluation, it helps in improving the accuracy of LLMs.
  • Reduces Subjectivity: The ability to create a test dataset using representative user inputs ensures that evaluations are less subjective.
  • Time-Saving: Streamlines the process of prompt crafting and model evaluation, saving significant time.
  • Enhanced Decision-Making: Provides detailed, actionable results that aid in better decision-making.
  • Resource Efficiency: Despite being resource-intensive, the inclusion of custom metrics and side-by-side comparison capabilities ensures resource efficiency in evaluations.

Pricing and Licensing

promptfoo offers a flexible pricing model likely based on subscription tiers, utilizing either pay-as-you-go or monthly/yearly plans. Isn’t explicitly stated whether there is a one-time purchase option. With a tiered pricing model, users can select the plan that best suits their requirements and budget. There is also an option for a free trial, enabling users to explore the tool’s capabilities before committing to a paid plan.

Support and Resources

promptfoo provides extensive support options, including comprehensive documentation that guides users through various functionalities and use cases. Additionally, a community forum and GitHub presence offer collaborative support and interaction with other users and developers. For personalized assistance, users can reach out via the support team available through a dedicated Discord channel.

promptfoo as an alternative to

promptfoo can serve as a robust alternative to other LLM evaluation tools such as

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