Waifu Deck
Free open-source Android anime art deck unifying 10 image boards with encrypted BYOS cloud sync.

About Waifu Deck
Waifu Deck is a free, open-source (AGPL-3.0), local-first Android anime illustration discovery and collection app. Swipe cards across 10 anime art boards (Danbooru, Safebooru, Gelbooru, Yande.re, Konachan, Sankaku, Rule34, Zerochan, Anime-Pictures, E-Shuushuu) with zero registration and no ads. Saved images are kept at full original resolution on your phone for offline browsing, and can be optionally synced to your own cloud storage (Cloudflare R2, S3-compatible, WebDAV, OneDrive, or Google Drive) with client-side encryption.
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