# TerribleSync vs iStem

The clearest difference is in-app purchases: TerribleSync at none against iStem's 1. TerribleSync also leads on iOS requirement (12.0 vs 16.0). On price, ads and device support there is nothing between them.

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

## The numbers

| Metric | TerribleSync | iStem |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/terriblesync/id1109759662/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 35 months | — |
| Monetization | Free | — |
| Size | 1 MB | 79 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Benjamin Roth](https://appshunter.io/developer/448057425) | [Jan Maes](https://appshunter.io/developer/1550506252) |

## What reviewers say

### TerribleSync

[App page](https://appshunter.io/ios/app/terriblesync/id1109759662)

Control the tempo of music hardware like synthesizers and drum machines using your iPhone or iPad. Features include tap tempo, precise dial adjustment, and buttons for performance effects. Requires a 3.5mm audio cable for connection.

**Highlights:** Tap tempo, Rotary tempo dial, Pause/mute button, Performance effect buttons, Clear interface, Open source project

**Features:** macOS Compatibility

**In-app purchases:** none


### iStem

[App page](https://appshunter.io/ios/app/istem/id6793296941)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iStem Activation | $4.99 | one-time |


## Frequently asked questions

### Is TerribleSync free?

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

### Is iStem free?

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

### Do TerribleSync or iStem have ads?

Neither TerribleSync nor iStem shows ads.

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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.*