# RF vs CalcFast

The clearest difference is price: CalcFast at Free against RF's $0.99. CalcFast also leads on update cadence (every 2 months vs every 8 months). RF's advantage is iOS requirement (13.0 vs 27.1). On ads, in-app purchases and device support there is nothing between them.

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

RF ships an update every 8 months, CalcFast every 2 months. The most recent releases landed on October 26, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | RF | CalcFast |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.2 (21 ratings)](https://appshunter.io/ios/app/calcfast/id876781417/reviews)** |
| Number of ratings | — | **21** |
| Positive reviews | — | 78.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 6 MB | 6 MB |
| Requires iOS | **13.0** | 27.1 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Julien Geissbuehler](https://appshunter.io/developer/1762554076) | [Hannes Sverrisson](https://appshunter.io/developer/428851947) |

## What reviewers say

### RF

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

**Features:** macOS Compatibility

**In-app purchases:** none


### CalcFast

[App page](https://appshunter.io/ios/app/calcfast/id876781417)

A fast and elegant calculator for Apple devices that displays your calculation history. It offers a Today Extension for quick access and supports Apple Watch, external keyboards, and VoiceOver.

**Highlights:** Calculation history display, Today Extension for quick calculations, Apple Watch app, Dark/light mode selection, External keyboard support, VoiceOver support

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

**In-app purchases:** none


## Frequently asked questions

### Is RF free?

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

### Is CalcFast free?

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

### Do RF or CalcFast have ads?

Neither RF nor CalcFast shows ads.

### Which is updated more often, RF or CalcFast?

RF ships an update every 8 months, and CalcFast every 2 months. Most recently, RF was updated on October 26, 2026 and CalcFast on November 1, 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.*