CFClimb – Codeforces Trainer for Android and iOS. It follows the weekly cycle of a competitive programmer: get reminded, compete, see the result, and look back at your progress.
Unofficial. Not affiliated with Codeforces. Data comes from the public Codeforces API.
- Contests: upcoming, live and past rounds, with running rounds pinned on top, a countdown to the next one, pull-to-refresh and add-to-calendar.
- Reminders: notifications 1 day, 1 hour or 10 minutes before the rounds you pick, rescheduled when Codeforces moves a round.
- Rating change alerts: a background check for your saved handle that notifies you when a new rating is published.
- Home-screen widget: next round and your rating (Glance on Android, WidgetKit on iOS).
- Profiles: rating history, solved problems by difficulty and tag, verdicts, languages and an activity heatmap.
- Compare: two handles side by side.
- Shared links: Codeforces profile and contest links open in the app ("Share → CFClimb" on
Android,
cfclimb://links on both platforms). - Offline first: everything you have opened is saved, so the app works without a connection.
- Kotlin Multiplatform with Compose Multiplatform for the UI on both platforms
- Room (KMP) database as the source of truth, Ktor for the API with a request throttle that respects the Codeforces rate limit
- Koin, kotlinx-datetime, DataStore
- WorkManager and
BGTaskSchedulerfor background checks, Glance and WidgetKit for widgets - Tests: kotlin.test, Turbine, Ktor
MockEnginecontract tests, Robolectric and Roborazzi screenshot tests; GitHub Actions builds and tests Android and iOS
Modules: composeApp (UI and platform code), shared (data and domain), iosApp (Xcode project
and widget extension).
./gradlew :composeApp:installDebug./gradlew :shared:testAndroidHostTest :composeApp:testDebugUnitTest :composeApp:verifyRoborazziDebug./gradlew :shared:iosSimulatorArm64Test :composeApp:iosSimulatorArm64TestOpen iosApp/iosApp.xcodeproj in Xcode to run the iOS app.
Captured on a Pixel 10 Pro.
