NBack 3D vs DivisorDescent
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NBack 3D
This app challenges your memory by requiring you to count 3D shapes of specific colors. As the 'N' value increases, the difficulty escalates, testing your ability to recall past stimuli in a sequence.
- N-Back memory challenge
- 3D shape and color recognition
- Increasing difficulty levels
- Sequence memorization
- Cognitive skill enhancement
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The task is only to count the 3D shapes of the specified shape and color, but as the N of the N ‘Back increases, it becomes more difficult. *N’Back : The current answer matches the one from N steps earlier in the sequence. *1’Back 1 task1: count & memorize 2 task2: count & memorize 3 answer for task1 4 task3: count & memorize 5 answer for task2 6 task4: count & memorize : *2’Back 1 task1: count & memorize 2 task2: count & memorize 3 task3: count & memorize 4 answer for task1 5 task4: count & memorize 6 answer for task2 7 task5: count & memorize :
DivisorDescent
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約数を体感せよ！ 「DivisorDescent」は、選んだ数の 約数 を素早く見つけてタップしていく、斬新な算数ゲームです。 • 数字の並びを縦・横グリッドから選択 • 正しい約数を見つけてタップで得点！ • 間違いや見逃しにはペナルティ！ • タイムボーナスやパーフェクトボーナスあり • 正解は色で即フィードバック 短時間で「数の力」を鍛えよう！
Screenshots
Verdict
The clearest difference is in-app purchases: DivisorDescent at none against NBack 3D's 1. DivisorDescent also leads on ads (none vs shown). NBack 3D's advantage is device support (3 vs 1). On price and iOS requirement 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. NBack 3D sells 1 one-off in-app purchase. DivisorDescent asks for nothing beyond the download.
| Parameter | NBack 3D | DivisorDescent |
|---|---|---|
| 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 | — |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 16.6 |
| Further details — not scored | ||
| Size | 5 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Yasuyoshi Ota | Katsuhiko Yao |
In-app purchases
NBack 3D
- Extend to 20'Back & Remove Ads$2.99
DivisorDescent
No in-app purchases
