# Calotech vs Dihr

The clearest difference is iOS requirement: Calotech at 13.0 against Dihr's 15.1. 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.

Calotech ships an update every 2 months, Dihr every 6 weeks. Both last shipped on September 10, 2026.

## The numbers

| Metric | Calotech | Dihr |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Size | 59 MB | 81 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Calorie Fluor](https://appshunter.io/developer/1693605712) | [Ali Group Srl](https://appshunter.io/developer/1755339340) |

## What reviewers say

### Calotech

[App page](https://appshunter.io/ios/app/calotech/id6450924301)

**Features:** Vision Pro support

**In-app purchases:** none


### Dihr

[App page](https://appshunter.io/ios/app/dihr/id6471106562)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calotech free?

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

### Is Dihr free?

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

### Do Calotech or Dihr have ads?

Neither Calotech nor Dihr shows ads.

### Which is updated more often, Calotech or Dihr?

Calotech ships an update every 2 months, and Dihr every 6 weeks. Most recently, Calotech was updated on September 10, 2026 and Dihr on September 10, 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.*