# ISRTRI vs Nadin Zeri

The clearest difference is update cadence: ISRTRI at weekly against Nadin Zeri's every 20 months. Nadin Zeri's advantage is iOS requirement (15.1 vs 18.6). On price 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.

ISRTRI ships an update weekly, Nadin Zeri every 20 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | ISRTRI | Nadin Zeri |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | **Weekly** | Every 20 months |
| Size | 17 MB | 48 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | **iPhone** | — |
| Age rating | 4+ | 4+ |
| Developer | [ran kellner](https://appshunter.io/developer/1372973121) | [Arbox LTD](https://appshunter.io/developer/1021244486) |

## What reviewers say

### ISRTRI

[App page](https://appshunter.io/ios/app/isrtri/id1546991465)

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

**In-app purchases:** none


### Nadin Zeri

[App page](https://appshunter.io/ios/app/nadin-zeri/id1638574754)

**In-app purchases:** none


## Frequently asked questions

### Is ISRTRI free?

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

### Is Nadin Zeri free?

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

### Which is updated more often, ISRTRI or Nadin Zeri?

ISRTRI ships an update weekly, and Nadin Zeri every 20 months. Most recently, ISRTRI was updated on October 29, 2026 and Nadin Zeri on October 27, 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.*