# CalcFast vs Houstudia Calculator

The clearest difference is iOS requirement: Houstudia Calculator at 15.1 against CalcFast's 27.1. On price, update cadence, 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.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 21, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | CalcFast | Houstudia Calculator |
| --- | --- | --- |
| Price | Free | 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 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 6 MB | 20 MB |
| Requires iOS | 27.1 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Hannes Sverrisson](https://appshunter.io/developer/428851947) | [Houstudia](https://appshunter.io/developer/1848855363) |

## What reviewers say

### 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

**In-app purchases:** none


### Houstudia Calculator

[App page](https://appshunter.io/ios/app/houstudia-calculator/id6754558086)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CalcFast free?

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

### Is Houstudia Calculator free?

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

### Do CalcFast or Houstudia Calculator have ads?

Neither CalcFast nor Houstudia Calculator shows ads.

### Which is updated more often, CalcFast or Houstudia Calculator?

CalcFast ships an update every 2 months, and Houstudia Calculator every 2 months. Most recently, CalcFast was updated on October 21, 2026 and Houstudia Calculator on October 17, 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.*