Mental Calculation & Abacus vs The FOUR
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Mental Calculation & Abacus
Engage in a fun and educational game designed to enhance mental calculation skills. Learn to use an abacus with an easy-to-follow tutorial and practice with diverse question types.
- Mental calculation practice
- Abacus learning tutorial
- Variety of practice questions
- Suitable for all ages
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Play the best Mental Calculation and Abacus game! * Practice with a variety of questions * Easy tutorial for learning Abacus
The FOUR
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Become the Master of Puzzles! Discover the hidden order of four symbols on each tile and solve increasingly complex puzzles as you progress through the levels! Gather hearts to access more stages, and unveil pieces of the hidden story by watching exclusive videos. Begin your journey to reveal mysteries only you can uncover!
Screenshots
Verdict
The clearest difference is ads: The FOUR at none against Mental Calculation & Abacus's shown. The FOUR also leads on update cadence (every 3 weeks vs every 6 months). Mental Calculation & Abacus's advantage is iOS requirement (12.0 vs 14.0). On price, 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.
Mental Calculation & Abacus ships an update every 6 months, The FOUR every 3 weeks. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.
| Parameter | Mental Calculation & Abacus | The FOUR |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 6 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 143 MB | 219 MB |
| Age rating | 4+ | 4+ |
| Developer | Park Jisang | Korea Campus Crusade for Christ |
In-app purchases
Mental Calculation & Abacus
No in-app purchases
The FOUR
No in-app purchases
Questions
Is Mental Calculation & Abacus free?
Is The FOUR free?
Do Mental Calculation & Abacus or The FOUR have ads?
Which is updated more often, Mental Calculation & Abacus or The FOUR?
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