# Doomsday Practice — Learn the Doomsday Algorithm

> Learn the Doomsday Algorithm (iPhone/iPad app by Taiyo Tsuchiya.)

- Source: https://appshunter.io/ios/app/doomsday-practice/id6763708034 (this page in markdown: same URL + `.md`)
- Developer: [Taiyo Tsuchiya](https://appshunter.io/developer/1868015190)
- Category: Education, Games
- Price: Free
- Age rating: 4+
- Requires: iOS 26.0 · 1 MB
- Languages: American English
- Released: 2026-04-27
- Data updated: 2026-08-30
- User reviews in markdown: https://appshunter.io/ios/app/doomsday-practice/id6763708034/reviews.md

## What is Doomsday Practice?

Doomsday Practice helps you master the Doomsday algorithm: a mental math technique for calculating the day of the week for any date in your head.

LEARN
Step-by-step lessons break the algorithm into digestible pieces. Understand the anchor days, memorize the Doomsday dates, and build a reliable mental framework at your own pace.

PRACTICE
Drill random dates across any year or century. Get instant feedback, track your accuracy, and build speed through repetition.

REVIEW
A clean reference sheet keeps the key rules and mnemonics at your fingertips while you're still building fluency.

TRACK YOUR PROGRESS
Streaks and stats keep you accountable. Watch your accuracy and response time improve over time.

Whether you're a mental math enthusiast, a memory competitor, or just want a party trick that actually impresses people: Doomsday Practice gets you there.


## Version history (last 1 release)

### 1.0 — 2026-04-27

No release notes.

## More apps by Taiyo Tsuchiya

- [Timezoner](https://appshunter.io/ios/app/timezoner/id6757636351)

All apps by Taiyo Tsuchiya: https://appshunter.io/developer/1868015190

## Related topics

[the doomsday](https://appshunter.io/ios/topics/the-doomsday) · [doomsday trainer](https://appshunter.io/ios/topics/doomsday-trainer)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*