Account and authentication
Firebase Authentication user ID, anonymous user ID, email address if you use email sign-in, Google sign-in identifiers if you choose Google sign-in, sign-in provider, and account state.
Legal
Privacy Policy
Last updated: June 21, 2026. This policy applies to the Numday Android app, package com.kamisoft.numday, and the website at numday-app.com. Numday is provided by Pabloku, the app developer. Privacy contact: privacy@numday-app.com.
Play first
You can try the challenge before creating an explicit account.
Public competition
Published rankings show aliases and scores, not email addresses.
Control
You can request deletion at numday-app.com/account-deletion.
What Numday is
Numday is a daily mental math challenge. Everyone receives the same chain of 7 calculations for the current challenge window, then can compare speed, accuracy, score, global ranking, and private league ranking.
You can play before creating an explicit account. Numday may still use Firebase anonymous authentication to keep the experience working, enforce guest limits, preserve local progress, and let you later link the same identity to email or Google sign-in if you choose to publish scores or keep an alias.
Data we collect
Competitive profile
Your public alias, alias reservation state, and optional future country or city fields if Numday later adds location-based rankings. Numday does not request precise device location permission.
Challenge and scores
Challenge key, calculation progress, score, completion time, wrong-answer count, score version, completion and submission timestamps, pending score state, ranking entries, and previous challenge references.
Leagues
League name, invite code, membership, member role, active or closed state, and score copies used to show private league rankings for the same daily challenge.
Usage, diagnostics, and ads
Analytics events for the play-first funnel, ranking usage, authentication flow, league actions, ad events, app and device information, crash reports, performance diagnostics, advertising identifiers, and consent choices when ads are enabled.
Preferences and notifications
Reminder settings, notification permission state, Firebase Cloud Messaging tokens where needed, language or app state needed for service operation, and local device preferences.
Data we do not intentionally collect
Numday does not intentionally collect payment card data, health data, contacts, SMS, call logs, microphone recordings, camera photos, or precise device location. If this changes in a future feature, the app and this policy will be updated before that feature is released.
How we use data
- To let you play the current challenge and practice mode.
- To keep one scored start per challenge window and enforce guest challenge limits.
- To save pending scores and publish eligible scores only when you choose to compete.
- To display global and league rankings using aliases, not email addresses.
- To create, join, leave, close, and rank private leagues.
- To provide sign-in, account recovery, alias reservation, reminders, sharing, and account deletion support.
- To measure activation, diagnose crashes, improve reliability, protect the service, and measure ad behavior outside active challenges.
When data is shared
We use service providers to operate the app. These may include Google Firebase services for authentication, Firestore, Analytics, Crashlytics, Remote Config, App Check, and Cloud Messaging; Google Play services; Google Mobile Ads; and Google User Messaging Platform for ad consent where required. These providers process data according to their own terms and privacy notices.
Your alias and competitive score data are visible to other players after you publish a score. League membership and league ranking data are visible to members of the same league. We do not sell personal or sensitive user data.
Website data
The Numday website is a static site used for marketing, privacy, support, and account deletion information. It does not currently use website analytics, advertising pixels, cookies, or contact forms. If you open the Google Play listing, Google may process data according to its own privacy policy.
Data security
Numday uses HTTPS and Firebase security controls for remote data. Access to profile, score, and league data is limited through app logic and Firestore security rules. No security system is perfect, but the app is designed to avoid exposing email addresses, authentication identifiers, or private account data in public rankings.
Retention and deletion
Competitive scores and ranking records may be retained to preserve current and past challenge leaderboards. Account data, alias, league memberships, notification tokens, and related private data are retained while your account is active or as needed for security, abuse prevention, legal compliance, support, and service operation.
You can request account deletion from the app where available or from the website at numday-app.com/account-deletion. When an account is deleted, we delete or anonymize account-linked personal data unless retention is required for legitimate reasons such as fraud prevention, security, legal obligations, support records, or preserving leaderboard integrity.
Your choices
- You can play before registering, subject to guest limits.
- You can choose not to publish a score after seeing your result.
- You can leave a private league. If the creator leaves, the league may close for all members.
- You can turn daily reminders on or off in the app and control notification permission in device settings.
- You can use device settings and consent dialogs to control advertising identifiers and ad consent where available.
- You can request deletion using the account deletion page.
Children
Numday is not directed to children under the age required to consent to data processing in their country. If you believe a child provided personal data, contact us so we can review and delete it where required.
International processing
Numday may use service providers that process data in countries other than yours. Where required, we rely on the provider safeguards, contractual protections, and privacy controls available for those services.
Changes
We may update this policy as Numday evolves. If changes are material, we will update this page and, where appropriate, provide notice in the app.