# Power car C.H.A9 vs Ruler Studio

The clearest difference is in-app purchases: Power car C.H.A9 at none against Ruler Studio's 1. Ruler Studio's advantage is update cadence (every 6 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Ruler Studio sells 1 one-off in-app purchase. Power car C.H.A9 asks for nothing beyond the download.

Power car C.H.A9 ships an update every 3 months, Ruler Studio every 6 weeks. The most recent releases landed on October 2, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Power car C.H.A9 | Ruler Studio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Size | 18 MB | 19 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Kimsroeurn Sokchea](https://appshunter.io/developer/1706768033) | [Spyridon Bousios](https://appshunter.io/developer/1168309944) |

## What reviewers say

### Power car C.H.A9

[App page](https://appshunter.io/ios/app/power-car-cha9/id6465794472)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ruler Studio

[App page](https://appshunter.io/ios/app/ruler-studio/id6777489772)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ruler Pro Lifetime | $2.99 | one-time |


## Frequently asked questions

### Is Power car C.H.A9 free?

Power car C.H.A9 is free to download, with no in-app purchases.

### Is Ruler Studio free?

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

### Do Power car C.H.A9 or Ruler Studio have ads?

Neither Power car C.H.A9 nor Ruler Studio shows ads.

### Which is updated more often, Power car C.H.A9 or Ruler Studio?

Power car C.H.A9 ships an update every 3 months, and Ruler Studio every 6 weeks. Most recently, Power car C.H.A9 was updated on October 2, 2026 and Ruler Studio on October 10, 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.*