Bert's Atlas is an offline geography trivia game for Android and iOS. Product behavior lives in spec.md, and engineering guidance lives in principles.md.

Architecture

domain: pure Kotlin Multiplatform trivia, timing, scoring, mastery, streak, and selection rules
composeApp: shared Compose UI, bundled resources, Room persistence, and platform adapters
catalogTool: non-test JVM catalog validator and editorial report generator
androidApp: thin Android application host
iosApp: thin Xcode application host

The platform hosts use app.bertsatlas. V1 has no accounts, telemetry, advertising, runtime network dependency, or Android internet permission. Catalog content and progress stay on the device.

Build and run

Install JDK 21, the Android SDK, Xcode, and just. The checked-in Justfile defaults to the local JDK and SDK paths used by this project; override JAVA_HOME or ANDROID_HOME when yours differ.

just --list
just build

Build the Android APK, or install and launch it on the configured device:

just android
just install-android

install-android targets OnePlus device 663c91b1 by default. Override it with BERTS_ATLAS_DEVICE=<serial>.

Build the shared simulator framework and Xcode host, or also install and launch the host:

just ios
just run-ios

The default simulator is iPhone 17 Pro. Override it with BERTS_ATLAS_SIMULATOR_DEVICE="<simulator name or UDID>". Regenerate iosApp/iosApp.xcodeproj with xcodegen generate --spec iosApp/project.yml after changing the XcodeGen specification.

Catalog gates

just catalog
just release

just catalog verifies that the bundled catalog is structurally safe to load and writes catalogTool/build/reports/catalog-review.txt. Structural success does not mean the content is editorially approved.

just release builds release artifacts without running automated tests and invokes the stricter editorial gate. It intentionally fails while any country, capital, fact, question, confusion explanation, or flag audit lacks documented human approval.

Release prerequisites

Automated test suites are outside the V1 verification strategy; follow the manual acceptance matrix in spec.md. The currently available OnePlus covers Android 15/API 35, and the installed simulator covers iOS 26.1. Android API 26, an iOS 15-compatible runtime or device, and a connected physical iPhone are unavailable here and remain mandatory release prerequisites. Do not publish based only on the local build recipes.