# Waifu Deck (waifudeck.app)

> Waifu Deck is a free, open-source (AGPL-3.0), private, local-first Android anime artwork collection app (`app.waifudeck.mobile`).

## Key Facts (Verified 2026-10-17)
- **Price & License**: 100% free, open-source under GNU AGPL-3.0. Zero subscriptions, zero ads, zero telemetry.
- **Architecture**: Local-first SQLite + content-addressed SHA-256 storage on Android. Works offline out of the box with zero configuration.
- **10 Art Sources**: Fair round-robin aggregation across Danbooru, yande.re, Konachan, Safebooru, Gelbooru, waifu.im, Nekos API, Rule34, e621, and e926, with instant tag autocomplete and exclusion filters (e.g. `-ai_generated`, `-furry`).
- **Bring Your Own Storage (BYOS) Encrypted Sync**: Optional multi-device sync to user-owned storage encrypted client-side with AES-256-GCM (keys derived on-device via scrypt from a user password).
- **Supported Cloud Backends**:
  1. **Cloudflare R2** (single API token auto-detects account & provisions bucket)
  2. **Bunny.net** (single Account API Key auto-provisions S3 Storage Zone)
  3. **Backblaze B2** (single `keyID:applicationKey` auto-detects endpoint & creates bucket-scoped key)
  4. **Google Drive** (narrow `drive.file` scope — accesses only the app's own folder)
  5. **OneDrive** (narrow `Files.ReadWrite.AppFolder` scope)
  6. **WebDAV / NAS** (Nextcloud, Synology, 123pan, Nutstore)
- **Residency Modes**:
  - **Device + Cloud (Full Mirror)**: Keeps thumbnails + full originals on phone and encrypted in cloud.
  - **Cloud-Only (Streamed Originals)**: Keeps lightweight thumbnails + tag index on phone; streams and decrypts full originals on demand.

## Canonical Links
- Homepage (Auto Locale): https://waifudeck.app/
- Simplified Chinese: https://waifudeck.app/zh/
- English: https://waifudeck.app/en/
- Japanese: https://waifudeck.app/ja/
- Traditional Chinese: https://waifudeck.app/zh-tw/
- Direct Android APK Download: https://waifudeck.app/api/app/download
- Latest Release Metadata JSON: https://waifudeck.app/api/app/latest
- Get an API key (video guides for Cloudflare R2, Bunny.net, Backblaze B2): https://waifudeck.app/en/keys/
- Source code (GitHub): https://github.com/fancydirty/waifu-deck
- Privacy Policy: https://waifudeck.app/privacy