# Stellar Intervals vs Z2/4×4 Trainer

The clearest difference is in-app purchases: Stellar Intervals at none against Z2/4×4 Trainer's 1. Stellar Intervals also leads on iOS requirement (15.1 vs 18.0). Z2/4×4 Trainer's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Z2/4×4 Trainer sells 1 one-off in-app purchase. Stellar Intervals asks for nothing beyond the download.

## The numbers

| Metric | Stellar Intervals | Z2/4×4 Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | — | Every 3 weeks |
| Size | 41 MB | 5 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Garage Projects AB](https://appshunter.io/developer/6774685578) | [Chenfei Chu](https://appshunter.io/developer/6776864992) |

## What reviewers say

### Stellar Intervals

[App page](https://appshunter.io/ios/app/stellar-intervals/id6774685576)

**Features:** macOS Compatibility

**In-app purchases:** none


### Z2/4×4 Trainer

[App page](https://appshunter.io/ios/app/z244-trainer/id6776864990)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Z2/4×4 Pro (Lifetime) | $14.99 | one-time |


## Frequently asked questions

### Is Stellar Intervals free?

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

### Is Z2/4×4 Trainer free?

Z2/4×4 Trainer is free to download, with in-app purchases available.

### Do Stellar Intervals or Z2/4×4 Trainer have ads?

Stellar Intervals shows ads; Z2/4×4 Trainer does not.

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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.*