# System Designer vs ActionLock

The clearest difference is rating: System Designer at 4.4 against ActionLock's 1.0. System Designer also leads on in-app purchases (none vs 4) and ads (none vs shown). ActionLock's advantage is update cadence (weekly vs monthly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. ActionLock sells 4 in-app purchases, starting at $8.99 per month. System Designer asks for nothing beyond the download.

System Designer holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: System Designer has 17 ratings behind it against 2, so its average is the more settled of the two.

System Designer ships an update monthly, ActionLock weekly. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | System Designer | ActionLock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (17 ratings)](https://appshunter.io/ios/app/system-designer/id1132983280/reviews)** | [1.0 (2 ratings)](https://appshunter.io/ios/app/actionlock-app-blocker/id6788766360/reviews) |
| Number of ratings | **17** | 2 |
| Positive reviews | 77.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 97 MB |
| Requires iOS | **15.6** | 16 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Erwan Carriou](https://appshunter.io/developer/1102494853) | [Dung Nguyen](https://appshunter.io/developer/6775109406) |

## What reviewers say

### System Designer

[App page](https://appshunter.io/ios/app/system-designer/id1132983280)

Design complex systems using a low-code platform that leverages UML standards. Generate code skeletons and manage components graphically. Run and test your system with dynamic type checking.

**Highlights:** UML-based system modeling, Code skeleton generation, Graphical component creation, MSON format for model definition, Dynamic type checking, Cross-device synchronization via GitHub

**Features:** macOS Compatibility

**In-app purchases:** none


### ActionLock

[App page](https://appshunter.io/ios/app/actionlock-app-blocker/id6788766360)

Transform screen time into workout time by completing exercises to unlock distracting apps. Earn XP for every rep, level up your character, and build healthy habits while staying focused.

**Highlights:** Smart app blocking, AI rep counting, Gamified fitness progression, Flexible screen time limits, Detailed exercise stats, Private, on-device processing

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $8.99 | per month |
| Yearly Premium | $19.99 | per year |
| Yearly Premium | $24.99 | per year |
| Yearly Premium | $24.99 | per year |


## Frequently asked questions

### Is System Designer free?

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

### Is ActionLock free?

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

### Which has better reviews, System Designer or ActionLock?

System Designer is rated higher. System Designer averages 4.4 out of 5 from 17 ratings, while ActionLock averages 1.0 from 2 ratings.

### Do System Designer or ActionLock have ads?

ActionLock shows ads; System Designer does not.

### Which is updated more often, System Designer or ActionLock?

System Designer ships an update monthly, and ActionLock weekly. Most recently, System Designer was updated on October 6, 2026 and ActionLock on October 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*