# SIM check vs ACM for locks

The clearest difference is ads: SIM check at none against ACM for locks's shown. SIM check also leads on update cadence (every 3 weeks vs every 6 months) and iOS requirement (8.0 vs 16.0). On price, 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.

SIM check ships an update every 3 weeks, ACM for locks every 6 months. The most recent releases landed on October 4, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | SIM check | ACM for locks |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Size | 38 MB | 10 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Aitrago.com Limited](https://appshunter.io/developer/1641208045) | [WOBBI TECHNOLOGY LIMITED](https://appshunter.io/developer/1667483448) |

## What reviewers say

### SIM check

[App page](https://appshunter.io/ios/app/sim-check/id1494560498)

**Features:** macOS Compatibility

**In-app purchases:** none


### ACM for locks

[App page](https://appshunter.io/ios/app/acm-for-locks/id6446193435)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SIM check free?

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

### Is ACM for locks free?

ACM for locks is free to download, with no in-app purchases.

### Do SIM check or ACM for locks have ads?

ACM for locks shows ads; SIM check does not.

### Which is updated more often, SIM check or ACM for locks?

SIM check ships an update every 3 weeks, and ACM for locks every 6 months. Most recently, SIM check was updated on October 4, 2026 and ACM for locks on October 7, 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.*