PromptPerfect

Web · API · Extension

Freedom report

Two barsScore 6.3

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

PromptPerfect is ranked #16 of 30 in AI prompt generators on Freedom251. It runs on API, Browser extension, Web. There is a free plan.

PromptPerfect plans and pricing

All plans

Free Free Free; open-source promptperfect.beaglecorp.com · 7 Oct 2026

Compared on AI prompt generators

Free plan: Yes
Model support: multiple
Optimization mode: automated
API access: Yes

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The record

Purpose: PromptPerfect is an open-source prompt optimizer that teaches users why a rewritten prompt works.
Optimization: The web app lets users paste a prompt, pick a mode, optimize it, and learn why the rewrite works.
Browser extension: The Chrome extension is described as working on sites including ChatGPT and Gmail.
API: The API accepts a draft prompt and returns an optimized version for use from a backend or scripts.
Providers: The API supports Gemini, OpenAI, and Anthropic providers.
Modes: The documented optimization modes include better, specific, cot, developer, research, beginner, product, and marketing.
API response: The API response includes optimized text, an explanation, changes, the raw text, provider, and model.
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.
Shared quota: The hosted Gemini free tier uses configured server keys, and anonymous callers on that deployment share the quota.
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.
Security: The homepage states that the user's API key never leaves their browser.
License: The homepage states that PromptPerfect is open source under the MIT License.
Maker: The product is identified as being by Beagle and built by the Beagle Builder Program.
Price from: Free

Where it ranks on Freedom251

Best AI Prompt Generators in 2026#16 of 30

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Sources

promptperfect.beaglecorp.com· checked 7 Oct 2026
promptperfect.beaglecorp.com/docs· checked 7 Oct 2026