# Re vs NBackCalc

The clearest difference is in-app purchases: Re 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.

Both are free to download. NBackCalc sells 1 one-off in-app purchase. Re asks for nothing beyond the download.

Re ships an update every 2 months, NBackCalc every 2 days. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Re | NBackCalc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 2 days** |
| Size | 12 MB | 1 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [有限会社知識情報研究所](https://appshunter.io/developer/418530418) | [YOSHINORI KONNO](https://appshunter.io/developer/1883074860) |

## What reviewers say

### Re

[App page](https://appshunter.io/ios/app/renum7/id6756367953)

**In-app purchases:** none


### NBackCalc

[App page](https://appshunter.io/ios/app/nbackcalc-working-memory/id6760832395)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 開発者を応援する | $0.99 | one-time |


## Frequently asked questions

### Is Re free?

Re is free to download, with no in-app purchases.

### Is NBackCalc free?

NBackCalc is free to download, with in-app purchases available.

### Do Re or NBackCalc have ads?

Re shows ads; NBackCalc does not.

### Which is updated more often, Re or NBackCalc?

Re ships an update every 2 months, and NBackCalc every 2 days. Most recently, Re was updated on October 15, 2026 and NBackCalc on October 17, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*