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 August 31, 2026 and September 12, 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
Questions
Is N'Back Butterfly free?
Is Atom Shell free?
Do N'Back Butterfly or Atom Shell have ads?
Which is updated more often, N'Back Butterfly or Atom Shell?
Other comparisons
