---
title: "Doomsday Practice - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "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 d"
---

# Doomsday Practice — United States
> Learn the Doomsday Algorithm

![Doomsday Practice App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/c4/d3/cc/c4d3ccfd-9b0b-eccb-e9bd-459b2c4a0adf/AppIcon-0-0-1x_U007ephone-0-1-85-220.png/434x0w.png)

**Developer:** [Unknown](https://apptail.io/developer/unknown-WyBLvb)
**Category:** Education
**Rating:** 5.0/5 (1 ratings)
**Price:** Free
**Bundle ID:** com.ttsuchiya.doomsday-practice
**Store:** Apple App Store
**Country:** United States
**Version:** 1.0 (released 2026-04-27)
**Original Release:** 2026-04-27
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6763708034)
**AppTail Page:** [https://apptail.io/app/doomsday-practice-eGKz/united-states](https://apptail.io/app/doomsday-practice-eGKz/united-states)

## Doomsday Practice Description
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.

## Doomsday Practice Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/0d/f2/5e/0df25ebe-9252-23b7-8923-28ba6effc705/appstorescreen1.jpg/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/99/0b/67/990b6712-cc23-76fb-468c-f541d6cb35c1/appstorescreen3.jpg/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/be/da/3d/beda3d10-726a-5d40-bd50-46e5a43cceec/appstorescreen5.jpg/1242x2688.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/e9/e2/59/e9e2591a-2808-bbe6-e6dc-cfe43f97bd2f/appstorescreen4.jpg/1242x2688.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/b6/6b/7d/b66b7d1d-856e-cfff-d706-fab23d269427/appstorescreen6.jpg/1242x2688.png)

## Doomsday Practice Rating Breakdown in United States
- 5 stars: 1 (100%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)






## Doomsday Practice Available In
- [United States](https://apptail.io/app/doomsday-practice-eGKz/united-states)
- [Jordan](https://apptail.io/app/doomsday-practice-eGKz/jordan)
- [Japan](https://apptail.io/app/doomsday-practice-eGKz/japan)
- [South Korea](https://apptail.io/app/doomsday-practice-eGKz/south-korea)
- [Cayman Islands](https://apptail.io/app/doomsday-practice-eGKz/cayman-islands)
- [Sri Lanka](https://apptail.io/app/doomsday-practice-eGKz/sri-lanka)
- [Mexico](https://apptail.io/app/doomsday-practice-eGKz/mexico)
- [Oman](https://apptail.io/app/doomsday-practice-eGKz/oman)
- [Philippines](https://apptail.io/app/doomsday-practice-eGKz/philippines)
- [Pakistan](https://apptail.io/app/doomsday-practice-eGKz/pakistan)
- [Taiwan](https://apptail.io/app/doomsday-practice-eGKz/taiwan)
- [Switzerland](https://apptail.io/app/doomsday-practice-eGKz/switzerland)
- [Venezuela](https://apptail.io/app/doomsday-practice-eGKz/venezuela)

---

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