Effective date: 2026-10-14 Last updated: 2026-10-14
Abacist is an offline math crossword game: every puzzle is made on your phone, at four sizes, and a daily puzzle is made from the date alone. We do not create accounts, do not ask for your email, and do not ship any analytics or tracking SDK. Your puzzles, your placements and your best times never leave your device. The app contains no code that can reach a server at all, apart from the advertising SDK described below.
If that’s all you wanted to know, you’re done. The sections below spell it out in detail.
com.dashfusion.mathcrossword)The following data is created and kept locally, in the app’s private storage. It never leaves the device.
There is no account, no location and no contact information anywhere in the app. The app explicitly opts out of Android cloud backup and device-to-device transfer. That has a cost worth knowing: a new phone starts Abacist at its defaults, and your puzzles and best times stay behind. The app says so in Settings.
To delete everything, clear the app’s storage (Android Settings → Apps → Abacist → Storage → Clear storage) or uninstall the app — Android removes the app’s private storage with it.
We have no servers and no cloud storage. We cannot see your puzzles or your times and we cannot recover them if you lose your device.
The app contains the Google Mobile Ads SDK. It shows an occasional full-screen interstitial ad — at most one after every third puzzle you solve and leave, never while you are placing numbers, never for the first puzzle you solve each time you open the app, never for a puzzle with a number revealed, and never two within ten minutes — plus an optional rewarded ad you can choose to watch to reveal one number of the puzzle on screen. There are no banner ads. Google may collect and process:
AdMob does not receive your puzzles, your placements or your times. Google’s handling of the data above is governed by Google’s own policies:
Consent (EEA, UK and Switzerland): on first launch the app shows Google’s certified consent form, and you choose whether personalised ads are allowed. You can change your answer at any time from Settings → Advert privacy options inside the app. You can also opt out of personalised advertising via your device’s system settings (Android: Settings → Privacy → Ads).
None. We don’t run any backend. We have no analytics SDK, no crash reporter that phones home, no Firebase, and no custom telemetry. There is no HTTP client anywhere in the app’s own code, and the build fails if one is ever added.
AD_ID) — required by Google Play for apps that serve
ads; used by AdMob as described above.Those are the only permissions the app asks for, and none of them is a run-time prompt. Abacist has no access to your location, contacts, camera, microphone, photos, files or notifications, and it asks for none of them; nothing in it vibrates. A test reads the built app’s own merged manifest on every run and fails the build if that list ever changes.
Abacist is not directed to children under 13 and is not designed for use under the COPPA framework. We do not knowingly collect data from children.
If we change the data we collect or the third-party services we integrate, we will update this page and bump the “Last updated” date above. Material changes will be flagged in the app’s release notes as well.
Questions, requests, complaints: dash.fusion@outlook.com.