PromptLens - AI Prompt Refinement Extension

Rewrite weak AI prompts before you send them. Inline suggestions for ChatGPT, Claude & Gemini. Open source, BYOK, privacy-first.

Rewrite weak prompts before you send them. PromptLens is an open-source Chrome extension that helps you refine AI prompts in real time, inside the tools you already use. It suggests stronger, clearer prompt rewrites inline — before you hit send — so you get better first-pass output with less back-and-forth. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ HOW IT WORKS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1. Add PromptLens to Chrome. 2. Choose your AI provider and add your API key. 3. Set an active model. 4. Start typing in a supported AI chat tool — PromptLens analyzes your draft and suggests a cleaner, more structured rewrite before you send. Setup takes about a minute. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SUPPORTED AI TOOLS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ PromptLens works inline directly inside major web-based AI chat interfaces and custom chat surfaces. No separate prompt editor. No extra tabs. Just better prompts inside the workflow you already have. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BRING YOUR OWN KEY (BYOK) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ PromptLens does not lock you into one AI provider. Connect your own credentials and choose from a wide variety of supported AI providers, or configure custom local and self-hosted models. Usage is billed directly by the provider you choose — no PromptLens markup. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHY PROMPTLENS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ Better first-pass responses — PromptLens catches vague phrasing and suggests stronger rewrites so your first result is more likely to be useful. ✦ Faster drafting — Accept a better prompt version inline and keep moving, instead of manually tightening every request. ✦ More control — Use your own provider and model. Improve prompts without being locked into one AI stack. ✦ Lower privacy anxiety — Prompt text goes only to the provider you configure. PromptLens does not route your prompts through a central relay service. ✦ Keyboard-friendly — Accept or dismiss suggestions without reaching for the mouse. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ PRIVACY-FIRST & OPEN SOURCE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ PromptLens is built for control, not lock-in. • API keys and prompt text stay in your browser storage. • Prompt analysis does not require a central PromptLens backend. • The codebase is open source — inspect it, fork it, contribute to it. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ WHO IT'S FOR ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ PromptLens is built for people who use AI chat tools regularly and want better output without turning prompt writing into a separate job: • Founders and operators who use AI for planning, strategy, and internal comms • Marketers and writers who draft with AI daily • Developers who use AI for coding, debugging, and technical writing • Researchers and analysts who need structured, specific AI responses • Anyone who wants clearer AI output with less manual rewriting ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ FAQ ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Q: Does PromptLens send my prompts to its own server? A: No. Prompt text is sent only to the AI provider you configure. PromptLens does not require a central backend for prompt analysis. Q: Which model does PromptLens use? A: You choose the provider and model. PromptLens supports major AI providers as well as custom and self-hosted endpoints. Q: Do I need to leave my current AI tool? A: No. PromptLens works inline inside the AI chat workflow you already use. Q: Is it really free? A: PromptLens is free and open source. You pay only your AI provider for model usage at their standard rates. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Better prompts. Less rewriting. No new workflow. Install PromptLens and start refining prompts today.