I built a local-first AI prompt manager — here is why offline-first was worth the extra complexity

Every developer I know who uses AI tools daily has the same problem. You write a prompt that works perfectly. You get exactly the output you needed from Claude or Cursor or ChatGPT. You close the tab. Next week the same problem comes up. You spend 20 minutes trying to reconstruct that prompt from memory. I got fed up with this and built PromptVault — a local-first prompt manager that works offline, has a browser extension for any AI tool, and includes AI features to help you write better prompts. Why local-first instead of just building a simple cloud app The obvious approach was to build a database, a backend, user accounts, and store everything server-side. I chose not to for two reasons. First — developers do not trust tools that store their prompts in someone else's database. Your prompts contain your entire thinking process, your preferred approaches, your project context. That is sensitive. Second — a local-first app is faster. There is no round trip to a server. Search is instan