N'Back Butterfly vs Mono
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
N'Back Butterfly
Enhance your cognitive abilities and combat forgetfulness with this application designed to improve working memory. It utilizes the scientifically recognized n-back task to train your brain's capacity for information recall and manipulation.
- Working memory improvement
- N-back task training
- Cognitive neuroscience assessment
- Continuous performance task
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Forget about forgetfulness! Improve your memory! Improve Working Memory using N'Back Butterfly. The n-back task is a continuous performance task that is commonly used as an assessment in cognitive neuroscience to measure a part of working memory. The n-back was introduced by Wayne Kirchner in 1958. [quoted from Wikipedia 2014-04-02]
Mono
A minimalist puzzle game where players aim to reduce the number of stones on a board to a single one. Stones can jump over adjacent stones, removing the jumped stone. This strategic elimination continues until only one stone remains.
- Single stone objective
- Jump over stones to eliminate
- Vertical and horizontal jumps
- Minimalist design
- Brain-training gameplay
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This is a puzzle game where the goal is to make the number of stones (black circles) on the board just one. Each stone can jump over another stone next to it in the vertical and horizontal directions. The stone that is jumped over disappears, reducing the number of stones on the board by one. Keep doing this until there is only one stone left on the board.
Screenshots
Verdict
The clearest difference is update cadence: Mono at every 4 days against N'Back Butterfly's every 10 months. Mono also leads on iOS requirement (13.4 vs 15.6). On price, ads, in-app purchases and monetization model 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.
N'Back Butterfly ships an update every 10 months, Mono every 4 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.
| Parameter | N'Back Butterfly | Mono |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | — | 1 — better |
| Update frequency | Every 10 months | Every 4 days — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | Ad-supported |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 13.4 — better |
| Further details — not scored | ||
| Size | 9 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Yasuyoshi Ota | Tomohiro Ichiba |
In-app purchases
N'Back Butterfly
No in-app purchases
Mono
No in-app purchases
