# changeis vs Engine

The clearest difference is ads: changeis at none against Engine's shown. changeis also leads on update cadence (every 5 days vs every 10 days). Engine's advantage is iOS requirement (15.1 vs 18.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. changeis sells 1 in-app purchase, starting at $9.99 per month and Engine sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

changeis ships an update every 5 days, Engine every 10 days. The most recent releases landed on September 13, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | changeis | Engine |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 10 days |
| Size | 88 MB | 54 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Nikolaj Rybakov](https://appshunter.io/developer/1841086164) | [Les Nants](https://appshunter.io/developer/1807100390) |

## What reviewers say

### changeis

[App page](https://appshunter.io/ios/app/changeis/id6756723012)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Sub | $9.99 | per month |


### Engine

[App page](https://appshunter.io/ios/app/engine-boost-your-vo2max/id6756730497)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $9.99 | per month |
| Yearly Plan | $39.99 | per year |


## Frequently asked questions

### Is changeis free?

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

### Is Engine free?

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

### Do changeis or Engine have ads?

Engine shows ads; changeis does not.

### Which is updated more often, changeis or Engine?

changeis ships an update every 5 days, and Engine every 10 days. Most recently, changeis was updated on September 13, 2026 and Engine on September 30, 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.*