# SKF Machine train alignment vs AC20

The clearest difference is update cadence: SKF Machine train alignment at every 3 months against AC20's every 21 months. AC20's advantage is iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SKF Machine train alignment ships an update every 3 months, AC20 every 21 months. The most recent releases landed on October 19, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | SKF Machine train alignment | AC20 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 21 months |
| Size | 69 MB | 45 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SKF](https://appshunter.io/developer/472922971) | [Daikin Electronic Devices Malaysia Sdn Bhd](https://appshunter.io/developer/1558022132) |

## What reviewers say

### SKF Machine train alignment

[App page](https://appshunter.io/ios/app/skf-machine-train-alignment/id1149906003)

**Features:** macOS Compatibility

**In-app purchases:** none


### AC20

[App page](https://appshunter.io/ios/app/ac20/id1604080534)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SKF Machine train alignment free?

SKF Machine train alignment is free to download, with no in-app purchases.

### Is AC20 free?

AC20 is free to download, with no in-app purchases.

### Do SKF Machine train alignment or AC20 have ads?

Neither SKF Machine train alignment nor AC20 shows ads.

### Which is updated more often, SKF Machine train alignment or AC20?

SKF Machine train alignment ships an update every 3 months, and AC20 every 21 months. Most recently, SKF Machine train alignment was updated on October 19, 2026 and AC20 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.*