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PromptPerfect
What it is
PromptPerfect is a free, open-source prompt optimizer available as a web app, Chrome extension, and API. The web app accepts a draft prompt, a selected mode, and returns an optimized rewrite with an explanation of why it works. Documented modes include better, specific, cot, developer, research, beginner, product, and marketing. The Chrome extension is described as working on sites including ChatGPT and Gmail. Its API accepts a draft prompt for backend or script use and returns optimized text, an explanation, changes, the original text, provider, and model. Supported providers are Gemini, OpenAI, and Anthropic. Provider keys can be sent in the request body or as a Bearer token, with the Bearer token taking precedence when both are supplied. The homepage says keys stay in the browser and that the project uses the MIT License. The hosted Gemini free tier uses configured server keys, so anonymous callers share that deployment's quota. The product is by Beagle and built through the Beagle Builder Program.
For and against
For
- Free open-source availability
- Web, extension, and API access
- Multiple optimization modes
- Explanations accompany rewrites
- Supports three providers
Against
- Anonymous Gemini users share quota
- Throughput depends on hosting and provider quotas
- Chrome extension is browser-specific
The verdict
PromptPerfect combines explanatory prompt rewriting with browser and API access at no listed cost. Its shared hosted quota and provider-dependent throughput matter for heavier API use.
Who it suits
PromptPerfect suits people who want guided prompt rewrites, explanations, and selectable optimization modes. Developers can use its API with Gemini, OpenAI, or Anthropic.
Plans and prices
Free
Free; open-source
Read 7 Oct 2026 · promptperfect.beaglecorp.com
On the record
- API
- The API accepts a draft prompt and returns an optimized version for use from a backend or scripts.promptperfect.beaglecorp.com · read 7 Oct 2026
- API keys
- Users can provide a provider API key in the request body or as a Bearer token; the documentation says the Bearer token takes precedence if both are supplied.promptperfect.beaglecorp.com · read 7 Oct 2026
- API response
- The API response includes optimized text, an explanation, changes, the raw text, provider, and model.promptperfect.beaglecorp.com · read 7 Oct 2026
- Browser extension
- The Chrome extension is described as working on sites including ChatGPT and Gmail.promptperfect.beaglecorp.com · read 7 Oct 2026
- License
- The homepage states that PromptPerfect is open source under the MIT License.promptperfect.beaglecorp.com · read 7 Oct 2026
- Maker
- The product is identified as being by Beagle and built by the Beagle Builder Program.promptperfect.beaglecorp.com · read 7 Oct 2026
- Modes
- The documented optimization modes include better, specific, cot, developer, research, beginner, product, and marketing.promptperfect.beaglecorp.com · read 7 Oct 2026
- Optimization
- The web app lets users paste a prompt, pick a mode, optimize it, and learn why the rewrite works.promptperfect.beaglecorp.com · read 7 Oct 2026
- Providers
- The API supports Gemini, OpenAI, and Anthropic providers.promptperfect.beaglecorp.com · read 7 Oct 2026
- Purpose
- PromptPerfect is an open-source prompt optimizer that teaches users why a rewritten prompt works.promptperfect.beaglecorp.com · read 7 Oct 2026
- Rate limits
- The documentation says the codebase does not enforce a custom requests-per-minute counter on the synchronous API; throughput depends on the hosting platform and provider quotas.promptperfect.beaglecorp.com · read 7 Oct 2026
- Security
- The homepage states that the user's API key never leaves their browser.promptperfect.beaglecorp.com · read 7 Oct 2026
- Shared quota
- The hosted Gemini free tier uses configured server keys, and anonymous callers on that deployment share the quota.promptperfect.beaglecorp.com · read 7 Oct 2026
