# KaraLog vs 4trMTR

The clearest difference is price: KaraLog at Free against 4trMTR's $0.99. KaraLog also leads on update cadence (every 9 days vs every 3 weeks). 4trMTR's advantage is in-app purchases (none vs 1) and iOS requirement (17.6 vs 26.5). On ads and device support there is nothing between them.

KaraLog is free to download; 4trMTR costs $0.99 up front. KaraLog sells 1 one-off in-app purchase. 4trMTR asks for nothing beyond the download.

KaraLog ships an update every 9 days, 4trMTR every 3 weeks. The most recent releases landed on October 4, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | KaraLog | 4trMTR |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | — | Free |
| Size | 8 MB | 12 MB |
| Requires iOS | 26.5 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuta Nishimatsu](https://appshunter.io/developer/1480004995) | [YUKIO TOKIWA](https://appshunter.io/developer/6776055556) |

## What reviewers say

### KaraLog

[App page](https://appshunter.io/ios/app/karalog/id6772887332)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KaraLog Pro | $2.99 | one-time |


### 4trMTR

[App page](https://appshunter.io/ios/app/4trmtr/id6776449627)

Record and layer multiple musical performances one track at a time to create a complete song. Easily manage your projects by saving, loading, and creating new ones through a simple tap interface.

**Highlights:** Four-track recording, Layered performances, Project saving, Project loading, New project creation

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

**In-app purchases:** none


## Frequently asked questions

### Is KaraLog free?

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

### Is 4trMTR free?

4trMTR costs $0.99, with no in-app purchases.

### Do KaraLog or 4trMTR have ads?

Neither KaraLog nor 4trMTR shows ads.

### Which is updated more often, KaraLog or 4trMTR?

KaraLog ships an update every 9 days, and 4trMTR every 3 weeks. Most recently, KaraLog was updated on October 4, 2026 and 4trMTR on October 25, 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.*