A quiet home for
everything you .

Books, audiobooks, notes, flashcards, and sketches. One desktop app that lives entirely on your machine.

Free · No tracking · Your data stays on your device

The Gnos library — books, audiobooks, and notebooks in one window

Gnos is for people who collect what they read. Your library, your notes, and your progress, kept together, kept offline, kept yours.

What's inside

Everything a library needs.
Nothing it doesn't.

  • E-Reader

    EPUB and PDF, six themes, full control of the type.

  • Audiobooks

    MP3 and M4B, chapters detected, speed up to 3×.

  • Notebooks

    Markdown with live LaTeX and highlighted code.

  • Flashcards

    Spaced repetition, built from your own notes.

  • Sketchbook

    An infinite Excalidraw canvas beside your library.

  • Private

    No account, no tracking. Everything stays on disk.

The Gnos e-reader — Moby Dick in a clean two-column layout

E-Reader

Reading that feels right.

EPUB and PDF, no conversion needed. Typeface, size, and spacing are all yours to set, then forget.

  • Six themes: sepia, light, moss, dark, cherry, sunset
  • Highlights and bookmarks
  • Chapter-level progress
The Gnos audiobook player — Great Expectations with a chapter list

Audiobooks

Listen the way you read.

Drop in MP3 or M4B. Chapters are detected automatically, and every book resumes exactly where you stopped.

  • Chapter list with one-click jump
  • Variable speed and 30-second skip
  • Per-book progress, saved silently
Gnos flashcards — a deck open in study view

Flashcards

Remember what you read.

Spaced repetition is built in. Make decks from your notes, or import the ones you already use.

  • Review only what's due, or everything
  • Study, list, and edit modes
  • Keyboard-driven flips
A Gnos notebook — Markdown with rendered LaTeX math

Notebooks

Notes that keep up.

Write in Markdown and watch it render as you type, with math, code, and headers included.

  • Live Markdown preview
  • KaTeX math, inline and block
  • Syntax-highlighted code
  • Attached to any book
The Gnos sketchbook — an Excalidraw canvas

Sketchbook

Room to think.

Diagram, annotate, and map ideas on an infinite canvas, without leaving your library.

  • Excalidraw, built in
  • Shapes, arrows, freehand
  • PDF pages as a background
The Gnos reading profile — streaks, heatmap, and top books

Analytics

Watch the habit form.

Daily reading time, streaks, and a twelve-week heatmap. Quiet numbers that keep you coming back.

  • Daily and weekly reading time
  • Per-book progress
  • Twelve-week activity heatmap

Six built-in themes

Light, dark, and every hour between.

Sepia, light, moss, dark, cherry, sunset, or follow the system.

Light Gnos in light mode
Dark Gnos in dark mode

Availability

Coming to

macOS
Windows
Linux

Bring your library home.

One email when a spot opens. Nothing else.

No spam. Email never shared.