nomad
The mobile half of the Fe2O3 suite. One Rust core, nineteen Kotlin / Compose apps, synced over Syncthing, with no Google account and no cloud middleman.
The mobile half of the Fe2O3 suite. One Rust core, nineteen Kotlin / Compose apps, synced over Syncthing, with no Google account and no cloud middleman.
Each app carries one Fe2O3 workflow off the laptop and onto an Android phone. The interesting code lives in Rust and is shared with the desktop tools, so the phone and the terminal compute identically; the Kotlin side stays a thin shell.
One crate (fe2o3-mobile-core) contains the models,
parsers, transforms and engines: the same logic as the desktop
tools. Exposed to Kotlin through
UniFFI,
which generates the bindings. Never hand-rolled JNI.
Compose for screens, Glance for home-screen widgets, WorkManager for background work that respects Doze and App Standby. No business logic that could live in the core.
Data rides the same Syncthing
channel the desktop already uses: todo.hl,
gear.json, the relay gateway, .xrpn
programs. One source of truth, no account, no middleman.
A single Cargo workspace and Gradle multi-project. Each app ships as its own signed APK with its own launcher icon, sideloaded from the synced folder. minSdk 33, Material 3.
Eighteen phone apps, most of them pairing with a tool from the Fe2O3 family.
Editor + Glance home-screen widget for the same
~/.tasks/todo.hl hyperlist that scribe edits and
kastrup's z triage appends to.
A general HyperList editor: full syntax highlighting, fold, drag-reorder across depth (collapsed items move as one), and auto-renumber.
Relays WhatsApp / Messenger / Instagram / SMS / Discord (and photo previews) into kastrup and fires replies, replacing the laptop's Firefox/Marionette bridge with an on-device listener.
Ephemeris, met.no weather + observing conditions, in-the-sky
events, APOD, starchart, and a telescope/eyepiece gear catalog:
the gear.json shared with desktop astro.
TMDB browser: top-rated & popular lists, your own wish and dump lists, posters, full detail (cast, plot, streaming), and search-to-add.
Amar RPG O6 roller: D6, skill, and combat rolls with the full crit/fumble tables, plus fear rolls with mental-fortitude vs a fear DR. Engine shared with the desktop and the d6gaming wiki.
Pocket HP-41 RPN scientific calculator: full stack, registers,
modes and the XRPN command set, an HP-41-style multi-shift
keypad, persistent state, and a FOCAL program runner that loads
.xrpn files from the synced folder.
Records on launch, transcribes through Whisper, then files the
text where you choose: under an Inbox in your synced
todo.hl or appended to a notes file. The pocket
version of the laptop's Win+a dictation.
Notes as plain Markdown files in a folder you share with
your laptop. Write #idea to tag a note, add photos
from the camera or the gallery, search all of it, as a list
or as cards. Desktop
scribe opens the same files with the pictures in the text, and
an import brings your Google Keep notes over.
An offline, searchable reference reader. Each collection is a set of titled entries: a glossary, a book, or a set of writings. Public collections ship bundled; your own load as JSON from a synced folder, so private corpora never leave your devices.
Reader for your personal daily news digest. A server-side Claude run
gathers the news you care about into a dated Markdown issue and a
typeset PDF; gazette browses the last 7 days synced into
~/.news and opens source links.
The library on your phone. On the laptop you curate a shelf of books that should exist and have Claude write the ones you grab; books is the read-only half: only finished books appear, grouped by shelf, with inline figures, read full-screen and offline.
The laptop browser's best parts around Android's own WebView. Send a tab to the laptop and back. The laptop's encrypted passwords and its bookmarks, shared over Syncthing. Ads blocked from the same hosts list, dark pages, and the page handed to the Claude app to ask about.
Every app you installed, newest first, system apps left out. Tap one to open it; long-press for app info or to uninstall. No Rust core and no background work.
Tag what you want, walk to where it should go, and copy or move it there. Nothing is overwritten, a delete goes to the trash, and every step can be taken back. Tabs, archives that open as folders, and search inside files. Other apps save straight into your marked folders. It cannot reach the network.
A minimal home-screen launcher: one screen, your widgets placed freely, and your apps in a panel that comes up on a swipe, also inside other apps. Long-press to edit: drag to move, pinch to resize per axis, tap a widget's ✕ to remove it. A bank app that refuses to run beside the swipe gets it switched off while it runs. Built to cost nothing when idle: no polling, no background wake-ups.
Your Gmail inboxes on the phone, decoded by the same crate kastrup uses. Headers on sync, bodies on open. The laptop stays authoritative: opening a message here changes nothing, only an explicit Mark READ does, and that reaches the laptop too. Swipe to clear a message off the phone without touching the archive. Unread count on the home screen.
The calendars your phone already keeps in sync, as a month with dots for each day's events and an agenda below it. A widget lists the coming 30 days. Make, change and delete events, and get their reminders. Each calendar can take the colour it has in tock on the laptop. It cannot reach the network.
Clone the monorepo, build the app you want, drop the signed APK in a Syncthing-shared folder, and sideload it on the phone:
# host tests for the shared Rust core (no emulator needed) PATH="/usr/bin:$PATH" cargo test -p fe2o3-mobile-core # a signed release APK (cargo-ndk + uniffi-bindgen run from Gradle) export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 export ANDROID_NDK_HOME="$HOME/.android-sdk/ndk/27.2.12479018" ./gradlew :apps:rpnx:assembleRelease # APK lands in apps/<name>/build/outputs/apk/release/; sync & sideload