Promptfoo

Test your LLM app before it breaks in production

Free

Promptfoo is an open-source framework for evaluating, testing, and red-teaming LLM applications that helps AI developers systematically measure prompt quality, detect regressions, and identify safety vulnerabilities before deployment. It supports automated testing across multiple LLM providers simultaneously, comparison of different model versions, and adversarial probing for jailbreaks and harmful outputs. AI engineering teams use Promptfoo as their CI/CD layer for prompt engineering — ensuring that every change to prompts or models is rigorously evaluated before reaching production users.

Promptfoo at a glance

Category	Developer Tools
Pricing	Free
Free plan	Yes
Official site	promptfoo.dev
Last checked	2026-10-23

Promptfoo is an AI-powered Developer Tools tool listed on Nextool.ai, a directory of 1,900+ AI tools. Promptfoo is free to use. Browse the Developer Tools category on Nextool.ai to compare similar tools, read reviews, and find the best fit for your workflow.

Key Features

LLM testing and evaluation framework
Red teaming and adversarial testing
Prompt injection testing
Automated CI/CD testing
Multiple provider support
Open-source tool

Use Cases

Testing LLM application security
Evaluating prompt robustness
Red teaming AI applications
Automated AI quality assurance

How to Choose a Developer Tools Tool Like Promptfoo

Developer Tools tools vary widely in quality and scope. When comparing Promptfoo with alternatives, weigh these factors:

Language, framework and IDE support
Code quality and how often suggestions need correction
Privacy of your source code and training-data policy
Context window and repository-awareness
Team and self-hosting options
Per-seat pricing against team size

Promptfoo Pricing

Promptfoo is free to use.

Visit Promptfoo →

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Frequently Asked Questions

What is Promptfoo?

Open-source CLI and library for testing and evaluating LLM prompts.

Is Promptfoo free?

Promptfoo is free to use.

What can I use Promptfoo for?

Promptfoo is an AI-powered tool in the Developer Tools category. Open-source CLI and library for testing and evaluating LLM prompts.

What are the best Promptfoo alternatives?

You can find the best Promptfoo alternatives on our Promptfoo alternatives page. Nextool.ai lists Developer Tools tools side by side so you can compare features and pricing.

How do I get started with Promptfoo?

To try Promptfoo, visit the Promptfoo website. Promptfoo is free to use. You can also explore alternative Developer Tools tools on Nextool.ai to compare options before committing.

What platforms does Promptfoo run on?

Promptfoo is a web-based AI tool. Check the Promptfoo website for the latest platform and device support.

How does Promptfoo compare to other Developer Tools tools?

Promptfoo is one of many Developer Tools tools listed on Nextool.ai. The best choice depends on output quality, integrations, data privacy and pricing for your use case — compare Promptfoo with its alternatives on Nextool.ai to find the right fit.

Is Promptfoo worth trying?

If you need to write, review and ship code more efficiently, Promptfoo is worth evaluating. It is free to use, so you can weigh it against similar Developer Tools tools on Nextool.ai before committing to a paid plan.

Do I need technical skills to use Promptfoo?

Most AI-assisted development tools, including Promptfoo, are built for non-technical users: you provide an input in plain language and review the AI-generated result. No coding is required to get started, though advanced features may reward experimentation.

Is my data safe with Promptfoo?

Data handling varies between Developer Tools tools. Before uploading anything sensitive to Promptfoo, review its privacy policy and terms to understand how your inputs are stored, processed and used — then compare that against the alternatives on Nextool.ai.

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