# RF Slide Rule vs RF

The clearest difference is price: RF Slide Rule at Free against RF's $0.99. RF Slide Rule also leads on update cadence (weekly vs every 8 months) and iOS requirement (7.0 vs 13.0). On ads, in-app purchases and device support there is nothing between them.

RF Slide Rule is free to download; RF costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RF Slide Rule ships an update weekly, RF every 8 months. The most recent releases landed on September 28, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | RF Slide Rule | RF |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 8 months |
| Size | 1 MB | 6 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CEC, S.A.](https://appshunter.io/developer/537230070) | [Julien Geissbuehler](https://appshunter.io/developer/1762554076) |

## What reviewers say

### RF Slide Rule

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

**Features:** macOS Compatibility

**In-app purchases:** none


### RF

[App page](https://appshunter.io/ios/app/rf-calc/id647697327)

**Features:** macOS Compatibility

**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 RF free?

RF costs $0.99, with no in-app purchases.

### Do RF Slide Rule or RF have ads?

Neither RF Slide Rule nor RF shows ads.

### Which is updated more often, RF Slide Rule or RF?

RF Slide Rule ships an update weekly, and RF every 8 months. Most recently, RF Slide Rule was updated on September 28, 2026 and RF 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.*