QUANTUM APPS

Free, open-source Android apps that stay out of your way. Some put the sites you already use behind one front door and block the ads on the way; others are tools that work with no network at all.

WRITTEN BY AI

Every app here was written by AI — Claude Code — including this page. The complete source for each one is public on GitHub. Read it before you install an APK, from me or from anyone. Nothing here collects analytics, telemetry or accounts.

THE APPS

Android 7.0 or newer, except Quantum Ink which needs 8.0. Installed by downloading the APK, not through the Play Store.

Quantum Ink icon

QUANTUM INK

WRITING
The writing canvas
THE PAGE
Sprints, goals and themes
SPRINTS
Chapters, lore and threads
THE BOOK

One honest note. The sprint lock asks Android to pin the screen rather than pretending to be a kiosk — no ordinary app can block task switching, and anything claiming otherwise is lying to you. It is friction that makes leaving deliberate. Your words are saved either way.

Quantum MTG icon

QUANTUM MTG

MAGIC: THE GATHERING
Moxfield theme
MOXFIELD
TCGplayer theme
TCGPLAYER
XMage Nexus theme
XMAGE NEXUS

Two limits worth knowing. Google blocks its sign-in flow inside every Android WebView, so use email or Discord on Moxfield. And XMage Nexus is the community and download site — the games themselves run in the separate XMage desktop client.

QuantumManga icon

QUANTUMMANGA

MANGA, LIGHT NOVELS, FANFIC
MangaFire theme
MANGAFIRE
MangaDex theme
MANGADEX
NovelUpdates theme
NOVELUPDATES
Novelous theme
NOVELOUS
RoyalRoad theme
ROYALROAD
HoneyFeed theme
HONEYFEED
Archive of Our Own theme
AO3

INSTALLING

Same three steps for every app here.

  1. Tap DOWNLOAD APK. The file lands in your downloads folder.
  2. Open it. Android asks whether to allow installs from your browser — allow it. You only do this once.
  3. Tap Install, then open the app.

Android may warn that the app is from an unknown developer. That warning appears for everything installed outside the Play Store, including this. The source is public if you want to check what you are installing, or build it yourself instead.