# OmronRSO vs First Calling App

The clearest difference is update cadence: OmronRSO at fortnightly against First Calling App's monthly. OmronRSO also leads on iOS requirement (13.0 vs 15.0). 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.

OmronRSO ships an update fortnightly, First Calling App monthly. The most recent releases landed on September 7, 2026 and August 22, 2026 respectively.

## The numbers

| Metric | OmronRSO | First Calling App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Size | 63 MB | 30 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Triad Technologies Pvt Ltd.](https://appshunter.io/developer/1367899763) | [ROSHVEER SERVICES PRIVATE LIMITED](https://appshunter.io/developer/1885209219) |

## What reviewers say

### OmronRSO

[App page](https://appshunter.io/ios/app/omronrso/id6738124394)

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

**In-app purchases:** none


### First Calling App

[App page](https://appshunter.io/ios/app/first-calling-app/id6760596159)

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

**In-app purchases:** none


## Frequently asked questions

### Is OmronRSO free?

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

### Is First Calling App free?

First Calling App is free to download, with no in-app purchases.

### Do OmronRSO or First Calling App have ads?

Neither OmronRSO nor First Calling App shows ads.

### Which is updated more often, OmronRSO or First Calling App?

OmronRSO ships an update fortnightly, and First Calling App monthly. Most recently, OmronRSO was updated on September 7, 2026 and First Calling App on August 22, 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.*