# Achromator vs Houstudia Calculator

The clearest difference is update cadence: Achromator at monthly against Houstudia Calculator's every 2 months. Houstudia Calculator's advantage is iOS requirement (15.1 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

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

Achromator ships an update monthly, Houstudia Calculator every 2 months. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Achromator | Houstudia Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Size | 1 MB | 20 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [HANS-JURGEN GRAF GROTE](https://appshunter.io/developer/1787606413) | [Houstudia](https://appshunter.io/developer/1848855363) |

## What reviewers say

### Achromator

[App page](https://appshunter.io/ios/app/achromator/id6739949388)

**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 Achromator free?

Achromator 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 Achromator or Houstudia Calculator have ads?

Neither Achromator nor Houstudia Calculator shows ads.

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

Achromator ships an update monthly, and Houstudia Calculator every 2 months. Most recently, Achromator was updated on October 25, 2026 and Houstudia Calculator on October 28, 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.*