# IRPT vs Hotstart Heater Sizing App

The clearest difference is update cadence: Hotstart Heater Sizing App at every 5 weeks against IRPT's every 13 months. Hotstart Heater Sizing App also leads on iOS requirement (12.0 vs 15.6). 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.

IRPT ships an update every 13 months, Hotstart Heater Sizing App every 5 weeks. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | IRPT | Hotstart Heater Sizing App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/hotstart-heater-sizing-app/id1437481017/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 5 weeks** |
| Monetization | — | Free |
| Size | 14 MB | 24 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Inland Rivers, Ports and Terminals, Inc.](https://appshunter.io/developer/1335742314) | [HotStart](https://appshunter.io/developer/1264092383) |

## What reviewers say

### IRPT

[App page](https://appshunter.io/ios/app/irpt/id1335742315)

**Features:** macOS Compatibility

**In-app purchases:** none


### Hotstart Heater Sizing App

[App page](https://appshunter.io/ios/app/hotstart-heater-sizing-app/id1437481017)

This application helps users select the optimal engine heater for industrial applications. It considers factors like fluid type, environmental conditions, and power requirements to provide a recommended solution. Users can then contact the developer to confirm their heater choice.

**Highlights:** Heater selection based on application details, Considers fluid type and environmental conditions, Calculates based on dimensions and power needs, Provides a recommended heater solution, Facilitates verification with the developer

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is IRPT free?

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

### Is Hotstart Heater Sizing App free?

Hotstart Heater Sizing App is free to download, with no in-app purchases.

### Do IRPT or Hotstart Heater Sizing App have ads?

Neither IRPT nor Hotstart Heater Sizing App shows ads.

### Which is updated more often, IRPT or Hotstart Heater Sizing App?

IRPT ships an update every 13 months, and Hotstart Heater Sizing App every 5 weeks. Most recently, IRPT was updated on October 11, 2026 and Hotstart Heater Sizing App on October 24, 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.*