Note-Taking App

A local note-taking app stores your notes in your browser's localStorage — a private storage area on your device that persists between browser sessions. Unlike cloud-based note apps (Notion, Evernote, Google Keep), a local note-taking app never sends your data to any server. Our note-taking app uses the browser's native `localStorage` API to save every keystroke automatically, so your notes are always there when you return — no account, no cloud, no signup required.

1. 1. Create and Select Notes: Click "New" in the sidebar to create a note. Click any note in the list to select it. The editor opens on the right with the note's title and content. Notes are sorted by last updated time.
2. 2. Write and Auto-Save: Type in the editor — every change is auto-saved to localStorage within 400ms. A "Saved" indicator appears briefly after each save. Toggle Markdown preview with the eye icon to see formatted output.
3. 3. Search, Download, and Manage: Use the search bar to filter notes by title or content. Click the download icon to save any note as a .txt file. Click the trash icon to delete a note (with confirmation). All operations run locally in your browser.

• Note Title: The title of each note, displayed in the sidebar list and used as the filename when downloading.
• Note Content: The full text content of each note, stored as plain text. Markdown formatting is preserved in the raw text and rendered in preview mode.
• Timestamps: Created and last-updated timestamps for each note, used to sort the note list and display relative time (e.g. "2h ago").
• localStorage Key: All notes are stored under the key `abacktools_notes_v1` in your browser's localStorage. You can inspect this in your browser's DevTools → Application → Local Storage.

Notes stored in localStorage are browser-specific — notes created in Chrome are not visible in Firefox or Safari. If you clear your browser data (cookies, cache, localStorage), your notes will be deleted. To prevent data loss, regularly download important notes as .txt files using the download button. localStorage typically allows 5–10 MB of data per origin — enough for thousands of text notes, but very large notes may approach this limit. The note-taking app does not support real-time sync, collaboration, or cross-device access — for those features, use a cloud-based note app.