Quick mental calculation vs Digit Invader Calculator
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Quick mental calculation
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Game to enter within a certain period of time the answer of mental arithmetic calculations will appear on the exam. Many times in a row you can do correct? It is a challenge to the rankings!
Digit Invader Calculator
This app combines a functional calculator with a retro arcade game inspired by classic calculator interfaces. It offers automatic game saving, a high score list, and multitasking support on iPads. A scaled-down version is also available for Apple Watch.
- Retro calculator game
- Basic calculator functions
- Automatic game save
- High score list
- iPad Stage Manager support
- Apple Watch version
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- The calculator includes basic functions, while the Digit Invader game replicates the old-school calculator gaming experience. - The game state is automatically saved when the user explicitly pauses or implicitly switches to a different app, allowing them to resume later. - A high score list is provided for users to challenge themselves. - Compatible with Stage Manager on supported iPads, enabling multitasking while having fun occasionally. - A special scaled-down version of Digit Invader is available for Apple Watch, allowing users to enjoy the game during exercise breaks or while waiting in line. - Localized in Japanese, Traditional Chinese, and Simplified Chinese..
Screenshots
Verdict
The clearest difference is ads: Digit Invader Calculator at none against Quick mental calculation's shown. Quick mental calculation's advantage is iOS requirement (12.0 vs 17.6). On price, update cadence, 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.
Quick mental calculation ships an update every 11 days, Digit Invader Calculator every 9 days. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.
| Parameter | Quick mental calculation | Digit Invader Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.8 (12 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 12 — better |
| Update frequency | Every 11 days | Every 9 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad, Apple Watch — better |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 21 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | ERX | Daniel Fu Keung Kwan |
In-app purchases
Quick mental calculation
No in-app purchases
Digit Invader Calculator
No in-app purchases
Questions
Is Quick mental calculation free?
Is Digit Invader Calculator free?
Do Quick mental calculation or Digit Invader Calculator have ads?
Which is updated more often, Quick mental calculation or Digit Invader Calculator?
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