Help & frequently asked questions

Koodinorppa is available for iPhone and iPad on the App Store. Search for "Koodinorppa" or go to apps.apple.com/app/id6772326937.

Sign in with Apple is Apple's recommended, most secure sign-in method: we never see your password, you can hide your email (Hide My Email), and no third party is involved. Your progress is saved to your own iCloud account (CloudKit Private Database) — we do not store it on our own servers.

Sign in with Apple is required so that your progress can sync across devices and the league/leaderboard system works. Without signing in you cannot use the app. If sign-in fails for some reason (e.g. no iCloud account in iOS settings), check that iCloud is enabled at Settings → Apple ID → iCloud.

Yes. Koodinorppa is completely free, contains no ads, and has no in-app purchases. All features are available to all users.

Your streak grows each day you complete at least one lesson. If you skip a day, the streak resets. We recommend setting a daily reminder (Settings → Notifications).

XP = experience points. You earn XP for every correct answer. Accumulated points raise your level and your standing in the league. The daily challenge awards double XP.

You have five hearts; you lose one for each wrong answer. Hearts refill automatically over time, or instantly if you complete a lesson without mistakes.

Each day has one themed challenge — e.g. loops on Mondays, algorithms on Fridays. Completing the daily challenge doubles the XP for that lesson. A new challenge appears every morning at 00:00 local time.

The Practice Hub is a spaced-repetition review area powered by the FSRS-5 algorithm. It collects exercises you got wrong and surfaces them again at the right moment — when your memory has faded just enough. Playing in the Practice Hub also restores your hearts.

You're in a cohort of 10 each week. Top 3 promote to a higher league next week, bottom 3 demote. Leagues: Bronze → Silver → Gold → Emerald → Diamond.

The Rankings tab shows players from around the world. You can filter: World / Finland / Friends. The Friends view requires Game Center friends. The leaderboard updates nearly in real time via CloudKit.

Settings → Language → choose Finnish or English. The change takes effect immediately — no restart needed. The language affects both the UI and lesson content.

Settings → My Account → Display name. The change appears immediately on your profile and in next week's league standings.

Settings → My Account → Delete account. This removes all your data: profile, progress, leaderboard entries, achievements. This action cannot be undone.

Settings → Sound & Haptics → turn off "Sound effects". You can also use your iPhone's Ring/Silent switch or Action Button — Koodinorppa's sounds respect the system mute setting.

Yes, if you use the same Apple ID on all your devices. iCloud syncs your profile and lesson progress. Sync may take a few seconds the first time you open the app on a new device.

Restart your iPhone and try opening Koodinorppa again. If it still crashes, send us a description at [email protected]. Tell us your iOS version (Settings → General → About) and Koodinorppa version (Settings → About Koodinorppa).

Check that:

• You are signed in with the same Apple ID on both devices
• iCloud Drive and CloudKit are enabled in iOS settings
• You have a working network connection

Pull-to-refresh on the Rankings tab forces a CloudKit sync.

Game Center achievements update with a brief delay. Open the Game Center app (iOS Settings → Game Center) and check that the achievement appears there. If not, send us a report.

The leaderboard updates with a 1–2 minute delay. Pull-to-refresh on the Rankings tab will refresh it.

Check:

• Your iPhone is not in silent mode (orange indicator visible on the Ring/Silent switch or Action Button)
• Media volume is above 0 (press Volume Up)
• Settings → Sound & Haptics → "Sound effects" is on
• Bluetooth headphones aren't routing the audio elsewhere

Yes. Koodinorppa contains no ads, in-app purchases, or chat features. Sign in with Apple ensures that children do not share personal data. We recommend using a Family Sharing child profile so a parent can manage screen time via Screen Time.

Yes, with parental consent. With a Family Sharing child profile, Apple automatically asks the parent for permission when a child tries to sign in to the app. This is Apple's Ask to Buy process.

Yes, we love to hear ideas. Send your suggestion to [email protected]. We read every piece of feedback.

Not at this time. We focused on a native iOS experience built in Swift. If there is enough demand we may consider an Android version later.

Most things work offline:

• Playing lessons (the content is bundled with the app)
• XP, streaks, hearts, progress

Network required: leaderboards, leagues, achievements, iCloud sync. Progress is saved locally and synced when you're back online.