PASSCODES vs NBackCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PASSCODES
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Aim for the world's number one instantaneous memory! Infinite Passcode is a super-simple game in which you simply memorize the passcode displayed on the screen and type it in. This game is perfect for activating the brain, improving memory, strengthening concentration. You can also see your memory rank in the world ranking. Please try it while you are on the move, in the middle of a boring meeting, or while waiting at the hospital!
NBackCalc
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NBackCalcは、認知科学で実証されたNバック課題をベースにした計算トレーニングアプリです。 【NBackとは?】 N個前の計算問題の答えを記憶しながら、新しい計算問題を解く二重課題です。「覚える」と「計算する」を同時に行うことで、ワーキングメモリ(作業記憶)を効率よく鍛えられます。 【特徴】 ・1〜10バックまで対応。自分のレベルに合わせて調整可能 ・加算・減算・乗算・除算から使用する演算を自由に選択 ・制限時間・問題数をカスタマイズ ・広告なし・完全無料 【こんな人におすすめ】 ・マルチタスクが苦手な人 ・あたふたしてしまいがちな人 ・物忘れが多いと感じている人
Screenshots
Verdict
The clearest difference is in-app purchases: PASSCODES at none against NBackCalc's 1. NBackCalc's advantage is ads (none vs shown) and update cadence (every 2 days vs every 2 months). On price, device support 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. NBackCalc sells 1 one-off in-app purchase. PASSCODES asks for nothing beyond the download.
PASSCODES ships an update every 2 months, NBackCalc every 2 days. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.
| Parameter | PASSCODES | NBackCalc |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 16 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | KENICHI YAMAMOTO | YOSHINORI KONNO |
In-app purchases
PASSCODES
No in-app purchases
NBackCalc
- 開発者を応援する$0.99









