ReadFlow is a cross-platform ebook reader that puts privacy and data ownership first. ReadFlow gives you: (1) App lock — PIN or biometrics so only you can open the app. (2) WebDAV sync — Your books,progress, and notes sync across devices on your own server (Nextcloud, 坚果云, etc.). You own the data. (3) Notes & highlights — Multi-color highlights, export to TXT/Markdown/CSV, share as cards. (4) Reading stats — Heatmaps, streaks, and reports. Supports EPUB, PDF, MOBI, AZW3, FB2, TXT. Free to use;