# RF Slide Rule vs GPF Bubble Level

The clearest difference is device support: RF Slide Rule at 3 against GPF Bubble Level's 1. RF Slide Rule also leads on iOS requirement (7.0 vs 18.6). On price, ads and in-app purchases there is nothing between them.

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

## The numbers

| Metric | RF Slide Rule | GPF Bubble Level |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | — |
| Size | 1 MB | 0 MB |
| Requires iOS | **7.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [CEC, S.A.](https://appshunter.io/developer/537230070) | [Gian Paolo Fontani](https://appshunter.io/developer/1866631629) |

## What reviewers say

### RF Slide Rule

[App page](https://appshunter.io/ios/app/rf-slide-rule/id448166676)

**Features:** macOS Compatibility

**In-app purchases:** none


### GPF Bubble Level

[App page](https://appshunter.io/ios/app/gpf-bubble-level/id6759933601)

**In-app purchases:** none


## Frequently asked questions

### Is RF Slide Rule free?

RF Slide Rule is free to download, with no in-app purchases.

### Is GPF Bubble Level free?

GPF Bubble Level is free to download, with no in-app purchases.

### Do RF Slide Rule or GPF Bubble Level have ads?

Neither RF Slide Rule nor GPF Bubble Level shows ads.

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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.*