# 聴速mimix vs NBackCalc

The clearest difference is in-app purchases: 聴速mimix at none against NBackCalc's 1. 聴速mimix also leads on iOS requirement (9.0 vs 17.0). NBackCalc's advantage is update cadence (every 2 days vs every 22 months). On price, ads and device support there is nothing between them.

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

聴速mimix ships an update every 22 months, NBackCalc every 2 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 聴速mimix | NBackCalc |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 48.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 4 MB | 1 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Samark Corporation](https://appshunter.io/developer/673041246) | [YOSHINORI KONNO](https://appshunter.io/developer/1883074860) |

## What reviewers say

### 聴速mimix

[App page](https://appshunter.io/ios/app/mimix/id673062573)

This music player allows precise control over playback speed, from 0.1x to 8.0x. It's useful for language learning, improving memory and concentration, and transcribing music. Note that some DRM-protected audio may not be playable.

**Highlights:** Adjustable playback speed (0.1x to 8.0x), 10-second rewind/forward, Single track repeat, Speed shortcut buttons, Independent sliders for position, volume, and speed

**Features:** macOS Compatibility

**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 聴速mimix free?

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

### Is NBackCalc free?

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

### Do 聴速mimix or NBackCalc have ads?

Neither 聴速mimix nor NBackCalc shows ads.

### Which is updated more often, 聴速mimix or NBackCalc?

聴速mimix ships an update every 22 months, and NBackCalc every 2 days. Most recently, 聴速mimix was updated on November 6, 2026 and NBackCalc on October 31, 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.*