# ALDS vs Engine

The clearest difference is in-app purchases: ALDS at none against Engine's 2. ALDS also leads on ads (none vs shown). Engine's advantage is update cadence (every 10 days vs every 6 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Engine sells 2 in-app purchases, starting at $9.99 per month. ALDS asks for nothing beyond the download.

ALDS ships an update every 6 months, Engine every 10 days. The most recent releases landed on October 27, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | ALDS | Engine |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 10 days** |
| Size | 24 MB | 54 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [LOTHAR MEDTEC GmbH](https://appshunter.io/developer/1571294754) | [Les Nants](https://appshunter.io/developer/1807100390) |

## What reviewers say

### ALDS

[App page](https://appshunter.io/ios/app/alds/id1571299306)

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

**In-app purchases:** none


### 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 ALDS free?

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

### Is Engine free?

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

### Do ALDS or Engine have ads?

Engine shows ads; ALDS does not.

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

ALDS ships an update every 6 months, and Engine every 10 days. Most recently, ALDS was updated on October 27, 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.*