N'Back Butterfly vs Atom Shell
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]
Atom Shell
A puzzle game where players strategically place electrons into inner shells to score points. With over 1000 levels, it offers a challenging and engaging experience for players of all ages.
- Electron placement mechanics
- Scoring system
- 1000+ levels
- Intuitive gameplay
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* All you have to do is to carefully move the electrons into the inner shells. * Try to place electrons closer to get more score. * 1000+ Levels
Screenshots
Verdict
The clearest difference is ads: Atom Shell at none against N'Back Butterfly's shown. Atom Shell also leads on monetization model (free vs ad-supported) and iOS requirement (9.0 vs 15.6). On price, review sentiment, update cadence and in-app purchases 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, Atom Shell every 6 months. The most recent releases landed on October 3, 2026 and October 15, 2026 respectively.
| Parameter | N'Back Butterfly | Atom Shell |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.5 (2 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 10 months | Every 6 months — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 149 MB |
| Age rating | 4+ | 4+ |
| Developer | Yasuyoshi Ota | Kamran Gasimov |
Customer experience
N'Back Butterfly
Atom Shell
In-app purchases
N'Back Butterfly
No in-app purchases
Atom Shell
No in-app purchases
