Local-first prompts: why your library should live on your device
What local-first means for a prompt notebook, why it beats cloud prompt managers for privacy and speed, and how to keep your data safe without an account.
Most prompt tools start the same way: make an account, hand over your data, pay a monthly fee to keep it. Promptsson takes the opposite approach. Your prompt library lives on your own device instead of a Promptsson server; finished content is shared only when you explicitly choose a sharing action. This guide explains what that means and why it matters.
What “local-first” actually means
A local-first app keeps the canonical copy of your data on your device, not on a company’s servers. In Promptsson’s case, everything you create - prompts, categories, ratings, settings - is stored in your browser using IndexedDB, a fast on-device database built into every modern browser. Explicit sharing remains under your control: Open in can send a finished prompt to the web destination you choose, and a temporary agent snapshot sends only the scope you select. While an edit is saving, a temporary browser-local recovery draft protects your latest prompt keystrokes; it is removed as soon as the IndexedDB write succeeds.
There is no sign-up, no sync server, and no analytics. Once loaded, the app reads and writes your prompt library directly from on-device storage without network round trips; reopening the site still requires a connection. Prompt content leaves your device only when you deliberately use Open in or create a temporary agent snapshot.
Why it’s better for a prompt notebook
- Privacy by default. Your prompts often contain working context - client names, code, draft writing. Local-first means the library does not leave your machine unless you explicitly share finished content.
- Speed. Reading from on-device storage is instant. There’s no network round trip between you and your own prompts.
- Ownership. No vendor can lock your prompts behind a paywall, change the terms, or delete your account. The data is simply yours.
The one trade-off: backups are on you
Local-first has a catch worth understanding: if you clear your browser storage, lose your device, or a browser evicts the data, it’s gone. Promptsson handles this in three ways:
- It asks the browser to mark your data as persistent so it isn’t evicted.
- It gives you a one-click Export to a single file.
- That file is plain, portable JSON you can keep in your own Dropbox, Google Drive, or a git repository - see backing up your prompts.
The bottom line
Local-first isn’t a limitation you tolerate - it’s the feature. You get a fast, private notebook that’s genuinely yours, and a portable backup you control.
Ready to try it? Open Promptsson - it loads with examples already in place.