# RF vs Kalkulators

The clearest difference is price: Kalkulators at Free against RF's $0.99. RF's advantage is in-app purchases (none vs 1) and iOS requirement (13.0 vs 15.0). On update cadence, ads and device support there is nothing between them.

Kalkulators is free to download; RF costs $0.99 up front. Kalkulators sells 1 one-off in-app purchase. RF asks for nothing beyond the download.

RF ships an update every 8 months, Kalkulators every 9 months. The most recent releases landed on September 20, 2026 and August 7, 2026 respectively.

## The numbers

| Metric | RF | Kalkulators |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/kalkulators/id761590320/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 9 months |
| Monetization | — | Free with in-app purchases |
| Size | 6 MB | 21 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Julien Geissbuehler](https://appshunter.io/developer/1762554076) | [iPinsoft](https://appshunter.io/developer/344616291) |

## What reviewers say

### RF

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Kalkulators

[App page](https://appshunter.io/ios/app/kalkulators/id761590320)

This app allows for complex calculations using numbers, operators, and variables. It offers multiple calculator instances and theme customization. Advanced mathematical functions and extended limits are available via in-app purchase.

**Highlights:** Expression input with operators and parentheses, Real-time calculation as you type, Variable support for dynamic calculations, Multiple calculator instances, Customizable themes (light/dark), User-defined precision

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kalkulators Pro | $0.99 | one-time |


## Frequently asked questions

### Is RF free?

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

### Is Kalkulators free?

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

### Do RF or Kalkulators have ads?

Neither RF nor Kalkulators shows ads.

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

RF ships an update every 8 months, and Kalkulators every 9 months. Most recently, RF was updated on September 20, 2026 and Kalkulators on August 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.*