# IE Calculator vs Mobile OTRS

The clearest difference is update cadence: Mobile OTRS at every 4 months against IE Calculator's every 10 months. IE Calculator's advantage is iOS requirement (9.2 vs 13.0). 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.

IE Calculator ships an update every 10 months, Mobile OTRS every 4 months. The most recent releases landed on October 11, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | IE Calculator | Mobile OTRS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ie-calculator/id1455888355/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 4 months** |
| Monetization | Free | — |
| Size | 16 MB | 23 MB |
| Requires iOS | **9.2** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gustavo Sousa](https://appshunter.io/developer/1079985358) | [Broadleaf Co., Ltd.](https://appshunter.io/developer/871699416) |

## What reviewers say

### IE Calculator

[App page](https://appshunter.io/ios/app/ie-calculator/id1455888355)

This app assists industrial engineers with manufacturing planning by providing tools for production capacity, takt time, and job efficiency calculations. It supports various demand frequencies and helps determine the time needed per unit.

**Highlights:** Production Capacity Calculation, Takt Time Calculation, Actual Jobs Per Hour (JPH), Hours Per Unit (HPU) Calculation, Support for various demand frequencies

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

**In-app purchases:** none


### Mobile OTRS

[App page](https://appshunter.io/ios/app/mobile-otrs/id1607244321)

**In-app purchases:** none


## Frequently asked questions

### Is IE Calculator free?

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

### Is Mobile OTRS free?

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

### Do IE Calculator or Mobile OTRS have ads?

Neither IE Calculator nor Mobile OTRS shows ads.

### Which is updated more often, IE Calculator or Mobile OTRS?

IE Calculator ships an update every 10 months, and Mobile OTRS every 4 months. Most recently, IE Calculator was updated on October 11, 2026 and Mobile OTRS on October 5, 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.*