PromptDiff

PromptDiff is a Chrome extension that saves the prompts you write for ChatGPT, Midjourney, Gemini, Claude, and other AI tools, tracks every version, and shows you exactly what changed between them with a built-in diff view. ■ Who it's for - You keep tweaking the same prompt and lose track of which version worked best - You want to know exactly what you changed between two attempts, not just "kind of remember" - You reuse prompts across ChatGPT, Midjourney, Gemini, and Claude and want them all in one place - You're tired of scrolling through chat history to find a prompt you wrote last week ■ Key feature: real diff comparison, not just a list of saves Most prompt managers just let you save snippets. PromptDiff keeps every version of a prompt and lets you compare any two side by side, with the exact changed words and phrases highlighted — so you can see precisely what made a prompt better (or worse). ■ How to use it 1. Select the prompt text on the page (or paste it) and save it with a title 2. Add a tool, project, and tags to keep things organized 3. Edit and save again — every edit becomes a new version you can diff against any earlier one ■ Free - Save prompts and tag them - See how many prompts you've saved - Import from JSON/CSV (including backups made on the paid version) ■ Paid (¥300 one-time purchase, not a subscription) - Diff view between any two versions - Non-destructive version history (nothing is ever overwritten) - Multiple projects - Export to JSON/CSV for backup ■ Privacy Your prompts are stored only in your browser (chrome.storage.local) and are never sent to any external server. Payment is handled entirely by ExtensionPay (Stripe).