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PromptPerfect

PromptPerfect is an open-source prompt optimizer from Beagle, available through a web app, Chrome extension, and API.

Place
#18 of 28
Score
5.9
PromptPerfect's website

What PromptPerfect is

PromptPerfect is an open-source prompt optimizer from Beagle, available through a web app, Chrome extension, and API. In the web interface, you paste a draft, select an optimization mode, and receive a rewritten prompt with an explanation of the changes and why the result 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. For backend or script use, the API accepts a draft and returns optimized text, explanations, changes, the original text, provider, and model. It supports Gemini, OpenAI, and Anthropic. Provider keys can be sent in the request body or as Bearer tokens, with Bearer taking precedence. The hosted Gemini free tier shares configured server-key quota among anonymous callers. The homepage says browser-entered keys never leave the browser. PromptPerfect is MIT licensed and has a free plan at no cost.

Good

  • Free plan at no cost
  • Web app, extension, and API access
  • Explains why rewritten prompts work
  • Supports Gemini, OpenAI, and Anthropic
  • Multiple documented optimization modes

Watch out

  • Hosted Gemini free quota is shared
  • Throughput depends on hosting and provider quotas

Who it suits

It suits people refining prompts in a browser, supported sites, or backend scripts. It also fits users who want explanations of prompt rewrites and support for Gemini, OpenAI, or Anthropic.

Verdict

PromptPerfect combines automated rewriting with explanations, several modes, and multiple access routes. Its free, open-source model is useful, while shared hosted quota may matter for anonymous Gemini use.

Plans and prices

From PromptPerfect's own pricing page, checked 7 Oct 2026.

All about pricing
PlanPriceWhat it gives you
FreeFreeFree; open-source

The facts

Each one read from PromptPerfect's own pages, with the date it was checked.

What it does

API
The API accepts a draft prompt and returns an optimized version for use from a backend or scripts.checked 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.checked 7 Oct 2026
API response
The API response includes optimized text, an explanation, changes, the raw text, provider, and model.checked 7 Oct 2026
License
The homepage states that PromptPerfect is open source under the MIT License.checked 7 Oct 2026
Modes
The documented optimization modes include better, specific, cot, developer, research, beginner, product, and marketing.checked 7 Oct 2026
Optimization
The web app lets users paste a prompt, pick a mode, optimize it, and learn why the rewrite works.checked 7 Oct 2026
Providers
The API supports Gemini, OpenAI, and Anthropic providers.checked 7 Oct 2026
Purpose
PromptPerfect is an open-source prompt optimizer that teaches users why a rewritten prompt works.checked 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.checked 7 Oct 2026
Security
The homepage states that the user's API key never leaves their browser.checked 7 Oct 2026
Shared quota
The hosted Gemini free tier uses configured server keys, and anonymous callers on that deployment share the quota.checked 7 Oct 2026

Where it runs

Browser extension
The Chrome extension is described as working on sites including ChatGPT and Gmail.checked 7 Oct 2026

The company

Maker
The product is identified as being by Beagle and built by the Beagle Builder Program.checked 7 Oct 2026

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