AALU

Open-source e-reader firmware for the Xteink X4 — focused on organizing the books you actually read.

AALU is custom firmware for the Xteink X4 e-paper reader, built for a personal library experience rather than a bare EPUB viewer. Series group themselves, finished books move out of the way, and your reading life is tracked in a way that's actually worth looking at. It runs entirely on-device on a 380 KB-RAM ESP32-C3 — no accounts, no telemetry, no cloud.

Highlights

• Library, not a file list — automatic series grouping, a drill-in series viewer, and a full-library Bookshelf grid; covers show a progress bar while reading and a check badge when finished.
• Reading stats, redone — hours, streaks, and per-book pace, plus an achievement-badge wall, a monthly reading-activity calendar, and a "Wrapped" year-in-review.
• A reading companion — a pet that levels up with every page and evolves from a cat to a tiger to a dragon.
• Better reading — in-book Quick Settings (fonts, margins, spacing), Bionic Reading mode, and an offline English dictionary with tap-to-define.
• Connected, but private — KOReader progress sync, WiFi book upload, OTA updates, multiple home themes, and all four screen orientations.

Built on CrossPoint and Seek Reader. Not affiliated with Xteink — a community project.