Doomsday calculator memory vs Doomsday Practice
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Doomsday calculator memory
Practice and memorize a method for quickly calculating the weekday of any given date. This app is based on John Conway's 1970 mathematical system, allowing you to test your abilities without external tools.
- Practice date calculations
- Memorize weekday method
- Based on John Conway's system
- No external tools needed
- Test your abilities
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In 1970, British mathematician John Conway devised a way to quickly calculate the weekday of any given date without the help of calculators, computers, or calendars. This app helps you to practice and memorize.
Doomsday Practice
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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.
Screenshots
Verdict
The clearest difference is iOS requirement: Doomsday calculator memory at 17.6 against Doomsday Practice's 26.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Doomsday calculator memory | Doomsday Practice |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 8 days | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 4 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Joao Vianna | Taiyo Tsuchiya |
In-app purchases
Doomsday calculator memory
No in-app purchases
Doomsday Practice
No in-app purchases
Questions
Is Doomsday calculator memory free?
Is Doomsday Practice free?
Do Doomsday calculator memory or Doomsday Practice have ads?
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