A field guide · Plates I–VI
The Herbarium of everything Memento keeps.
Each part of the app, pressed, labelled and drawn as it grows — with an honest label saying what is sealed on your device and what our server can read.
What ships in Memento today, area by area. Our Security page lists what is and isn't encrypted.
Encrypted Notes & Editor
Filix scripta — The heart of your secure workspace
Note taking with a zero-knowledge architecture. Your note content is encrypted locally before it ever touches the cloud.
Security & Integrity
- XChaCha20-Poly1305 AEAD Encryption
- Argon2id password hashing
- Auto-save
- Wiki-style links & backlinks
Professional Editor
- Syntax highlighting for 37 languages
- Sortable tables with cell coloring
- LaTeX math rendering (KaTeX)
- 61 note templates
Multimedia
- Encrypted image attachments
- OCR image text extraction
- Markdown shortcuts as you type
Organization
- Nested folders
- Tagging system
- Drag & drop restructuring
- Color-coded folder hierarchy
Details
- The / menu inserts text, three heading sizes, bulleted, numbered and to-do lists, quotes, code blocks, equations, tables, images, links and dividers
- Syntax highlighting for 37 languages, including TypeScript, Python, Go, Rust, SQL and Bash
- LaTeX math rendered with KaTeX, inline with $…$ or as a block with $$…$$
- Tables with resizable columns, sortable headers and cell colors
- Text extraction from images (English) runs in your browser with Tesseract.js, and the text is encrypted with the note
- 61 ready-made templates in six categories
- Notes can be up to 100,000 characters
Secure Password Vault
Semen clausum — End-to-end encrypted credential management
A dedicated vault for your most sensitive secrets. Store logins, credit cards, and secure notes with granular field-level encryption.
Credential Storage
- Login & Identity management
- Secure card storage
- Encrypted secure notes
- Custom item templates
Advanced Security
- Individual field encryption
- Real-time password strength meter
- Passkey unlock (Face ID / Touch ID)
Ease of Use
- Reveal-on-demand fields
- Secure password generator
- Remote session management
Details
- Passwords, cards, identities and secure notes, plus your own templates with text, password, email, URL, number, date and checkbox fields
- A password generator that draws 18 characters (by default) with crypto.getRandomValues from a 73-character set without look-alikes such as l, I, O, 0 and 1
- A four-step strength meter: Weak, Fair, Good, Strong
- Item names, types and field labels are stored unencrypted so the vault can list and sort them
Smart Links Manager
Mycelium nexum — Your digital library, organized
More than bookmarks. Memento fetches each page's title, description and image, and lets you organize links into collections.
Web Extraction
- Automatic metadata extraction
- Favicon & preview image capture
- Platform detection (Social, News, etc.)
Organization
- Smart collections (Auto-grouping)
- Categorical tagging
- Favorite/Pinned links
Interoperability
- Bulk browser bookmark import
- Export to HTML/JSON formats
- Global link search
Details
- Our server fetches each preview with a 10-second timeout and a 5 MB cap, and refuses private network addresses
- Import a bookmarks file exported from your browser, or JSON, and export your links the same way
- The browser extension (beta) adds right-click options to save a page, a link or selected text, and Alt+Shift+S (Ctrl+Shift+S on Mac) saves the current page
- Saved links aren't end-to-end encrypted
AI Prompts Manager
Spira rogata — Power up your AI workflow
A dedicated workspace to save, iterate, and organize your most effective AI prompts for ChatGPT, Claude, and more.
Prompt Engineering
- Version number on every edit
- Categories and tags
Productivity
- One-click clipboard copy
- Favorite prompt collections
- Bulk prompt export (JSON)
Details
- One-click copy that clears the clipboard after a minute
- Organize by category and tags
- A version number that goes up each time you edit a prompt
- Prompt text is encrypted on your device; titles, descriptions, categories and tags are not
- Export prompts as JSON
Sync & Offline First
Radix gemina — Seamless access, everywhere
Engineered for reliability. Memento works without internet and syncs when back online.
Real-Time Engine
- Socket.io real-time push
- Content encrypted before upload
Offline Architecture
- Encrypted IndexedDB local cache
- Full offline editing & searching
- Conflict resolution
- Background sync queue logic
Details
- Notes, folders, vault items, prompts and links update on your other devices over a WebSocket
- A service worker caches the app; your data is kept in IndexedDB
- Changes made offline are queued and retried automatically
- A conflict screen lets you keep either version or merge them
- Installs as an app, with shortcuts for New Note, Search Notes and Vault
Productivity & Security
Lichen diligens — Advanced tools
Beyond basic features. Memento includes a suite of advanced tools to automate your workflow and secure your digital life.
Global Search
- Full-text search
- Advanced boolean & regex operators
Secure Capture
- Email-to-Notes inbox (stored unencrypted)
- Secret code & Whitelist protection
- PWA quick-capture shortcuts
Backup
- Encrypted backups to your own Google Drive, Dropbox or OneDrive
- Scheduled backups that run while the app is open and unlocked
Audit & Safety
- Tamper-evident audit logs
- QR code generation for instant sharing
- Inactivity auto-lock (15 min)
- New-device sign-in alert emails
Details
- Search operators: "exact phrase", +word, -word, word*, tag:, folder:, from: and to: dates, type:, is:starred and regex:
- Search runs in your browser on your decrypted data
- ⌘/Ctrl+K opens search from anywhere; Ctrl+Shift+N opens quick capture
- Backups encrypted on your device, downloaded or saved to your own Google Drive, Dropbox or OneDrive; scheduled backups run daily, weekly or monthly while Memento is open and unlocked
- Each email-to-notes inbox has a secret address and an allowed-senders list; these notes are stored unencrypted
- Activity log entries are hashed with SHA-256, chained and signed with HMAC-SHA256
- Email alerts when a new device signs in or your account email changes
Plate VII is blank. It’s waiting for what you keep.
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