Quill

Overview

An zero knowledge encryption privacy-focused social journaling app. Create a diary, invite friends, and journal together.

Screenshots

Diaries	Calendar	Entry List	Entry	Dark Mode

Features

• Multiple diaries: Organize your thoughts with separate diaries which are encrypted and saved into your local database
• Calendar: Jump to any date and quickly add an entry with a tap
• Rich Entries: Bring your journals to life with beautiful text formatting, photos, videos and voice recordings
• Accounts: Sign up and add your own profile picture
• Polished experience: Haptic feedback, dark mode, and a clean design you will enjoy writing in
• Shared Diaries: Get invited by friends or invite them, and have a safe space to write and view each other's thoughts.
• Different Views: See your entries in many views: list, gallery, timeline and more.
• More customization options: Change the diary's color and more. We love customization and you do too.
• Built-in applock: Lock the app with biometrics or a custom app PIN.
• Encrypted sync: Your shared diaries' entries will be synced to a database using end-to-end encryption, so only you and your friends can read them.

Upcoming Features

These features are planned but not yet implemented.

• Notifications: Get a notification every day to remember to keep the streak.

The diagram below shows the planned design for encrypted syncing once this feature is implemented:

flowchart LR
    subgraph C1["Client 1"]
        C1db[(Local DB)]
        C1keys["Private key + Public key"]
    end

    subgraph BE["Backend (Supabase)"]
        BEkeys[(Public key directory)]
        BEwrapped[(Wrapped diary keys)]
        BEdata[(Ciphertext store)]
    end

    subgraph C2["Client 2"]
        C2db[(Local DB)]
        C2keys["Private key + Public key"]
    end

    C1keys -->|register public key| BEkeys
    C2keys -->|register public key| BEkeys

    BEkeys -->|fetch member's public key| C1keys

    C1keys -->|wrap diary key with member's public key| BEwrapped
    BEwrapped -->|download wrapped diary key| C2keys

    C1db -->|encrypt entry with diary key, upload| BEdata
    C2db -->|encrypt entry with diary key, upload| BEdata

    BEdata -->|download, decrypt with diary key| C1db
    BEdata -->|download, decrypt with diary key| C2db

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Tech Stack

• React Native + Expo
• Expo Router — used for navigation between screens
• React Native Libsodium - used for cryptography
• TypeScript
• Local database: SQLite via expo-sqlite
• Backend: Supabase
• Rich text editor: 10tap-editor — used for implementing the editor
• React Native Reanimated and Gesture Handler: Used to make smooth animation and gesture-based interactions

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Created with ❤️ by NiceSapien, AmrGamalbit, and Crewshon!