Waifu Deck

What is Waifu Deck

Waifu Deck is a free, open-source (AGPL-3.0) Android app for discovering and collecting anime illustrations. It turns ten booru-style image boards into a swipe deck: swipe left to skip a picture, swipe right to keep it in your personal library. There is no registration, no ads, and no tracking — the library lives on your phone first, with optional encrypted synchronization to your own cloud storage.

Key Features

• Ten Image Boards in One Deck: Browse Danbooru, Safebooru, Gelbooru, yande.re, Konachan, waifu.im, Nekos API, Rule34, e621, and the SFW-only mirror e926 without juggling sites or clients. Gelbooru and Rule34 connect with your free API keys.
• Swipe-to-Collect Browsing: Keep the art you love with a single swipe, and control the mix with all / SFW-only / NSFW-only source modes plus an exclude filter.
• Original Quality, No Duplicates: Saved images keep their full original resolution, and sorting by collection time, resolution, or file size keeps the library organized.
• Encrypted BYOS Cloud Sync: Synchronize with Cloudflare R2, Bunny.net, Backblaze B2, Google Drive, OneDrive, or WebDAV/NAS — images are encrypted with AES-256-GCM before they ever leave the device.
• Cloud-Only Albums: Keep thumbnails on the phone and fetch full images on demand to save device space.
• Fully Offline and Private: Saved albums browse offline, gallery photos can be imported, and the developers operate no servers at all.

Use Cases

• Personal Art Collection: Build a distraction-free, ad-free library of anime illustrations from ten boards in one swipeable deck.
• Wallpaper Curation: Hunt full-resolution art and sort by resolution and file size to find perfect wallpaper candidates.
• Private Cloud Backup: Keep a password-protected, encrypted archive of your collection on your own storage with no vendor lock-in.
• Offline Viewing: Enjoy saved albums anywhere — flights, commutes, or places without connectivity.

Frequently Asked Questions About Waifu Deck

Is Waifu Deck free?

Yes. The app is free and open source under the AGPL-3.0 license, with no ads, subscriptions, or hidden costs — the developers run no servers, so there are no hosting fees to pass on.

Which image boards does Waifu Deck support?

Ten sources: Danbooru, Safebooru, Gelbooru, yande.re, Konachan, waifu.im, Nekos API, Rule34, e621, and e926 (a SFW-only mirror of e621). Gelbooru and Rule34 require your own free API keys.

How does cloud sync work?

You bring your own storage — Cloudflare R2, Bunny.net, Backblaze B2, Google Drive, OneDrive, or a WebDAV/NAS server. Every image is encrypted with AES-256-GCM on the device before upload, and access is password-based: a forgotten password means the data cannot be recovered, including by the developers.

Does it work offline?

Yes. Waifu Deck is local-first: collected images live on the phone and albums browse fully offline. Cloud synchronization is entirely optional, and cloud-only albums fetch full images on demand.

How do I install the app?

Waifu Deck ships as a signed APK outside the app stores. Install from the release downloads published with SHA-256 checksums, update in-app, or track releases with Obtainium.