# Kalorex vs ZRS

The clearest difference is update cadence: ZRS at every 11 days against Kalorex's every 6 months. 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.

Kalorex ships an update every 6 months, ZRS every 11 days. The most recent releases landed on September 12, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Kalorex | ZRS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 11 days** |
| Size | 88 MB | 56 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Myclassboard Educational Solutions Private Limited](https://appshunter.io/developer/1261722731) | [Wama Sompura](https://appshunter.io/developer/1688550761) |

## What reviewers say

### Kalorex

[App page](https://appshunter.io/ios/app/kalorex/id1554459403)

**In-app purchases:** none


### ZRS

[App page](https://appshunter.io/ios/app/zrs/id6758688938)

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

**In-app purchases:** none


## Frequently asked questions

### Is Kalorex free?

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

### Is ZRS free?

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

### Do Kalorex or ZRS have ads?

Neither Kalorex nor ZRS shows ads.

### Which is updated more often, Kalorex or ZRS?

Kalorex ships an update every 6 months, and ZRS every 11 days. Most recently, Kalorex was updated on September 12, 2026 and ZRS on September 15, 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.*