Prompt Mixer
Open-source desktop app for creating, testing, and evaluating AI prompt chains with multiple models.
| What is it | Open-source desktop app for creating, testing, and evaluating AI prompt chains with multiple models. |
|---|---|
| Pricing | Freemium |
| Free tier | Yes |
| Platform | Desktop Application |
| API | Yes |
| Best for | Creating and testing AI prompt chains, Comparing performance across multiple AI models |
| Domain registered | 2023 |
Data updated Aug. 1, 2026
What does Prompt Mixer do?
Prompt Mixer is a desktop application designed specifically for prompt engineering workflows. It provides a comprehensive workspace where teams can create, test, and evaluate chains of prompts across multiple AI models. The tool allows you to build prompts using Markdown, maintain version control automatically, and integrate datasets directly into your prompt structures for dynamic content generation.
What sets Prompt Mixer apart is its focus on testing and evaluation capabilities. You can connect to various AI providers through built-in or custom connectors, run comparisons between different prompts and models, and use sophisticated evaluation metrics including regex matching, semantic similarity checks, and JSON schema validation. The tool also supports running custom Javascript or Python code for advanced output assessment, making it particularly valuable for serious prompt engineering work.
This tool is ideal for AI developers, data specialists, and engineering teams working on AI-powered solutions. Real-world use cases include creating sales pitches and marketing collateral, generating SEO blog posts, extracting data from contracts and invoices, and building Q&A systems over documentation. The free version includes all main functions, while paid plans add collaboration features, synchronization, and enterprise-level deployment options.
Key features
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