# SI To USCS unit Conversion vs Century HVAC Distributing

The clearest difference is ads: SI To USCS unit Conversion at none against Century HVAC Distributing's shown. SI To USCS unit Conversion also leads on monetization model (free vs ad-supported). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for SI To USCS unit Conversion against 5.0 for Century HVAC Distributing. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

SI To USCS unit Conversion ships an update every 10 months, Century HVAC Distributing every 6 months. The most recent releases landed on October 30, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | SI To USCS unit Conversion | Century HVAC Distributing |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/si-to-uscs-unit-conversion/id502598595/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/century-hvac-distributing/id1560720964/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 6 months** |
| Monetization | **Free** | Ad-supported |
| Size | 1 MB | 2 MB |
| Requires iOS | **14.3** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [Century Air Conditioning Supply LLC](https://appshunter.io/developer/1554907153) |

## What reviewers say

### SI To USCS unit Conversion

[App page](https://appshunter.io/ios/app/si-to-uscs-unit-conversion/id502598595)

This app facilitates quick unit conversions between SI and USCS/Imperial systems for engineering applications. It covers 18 major categories, including mass, length, volume, and thermodynamics properties. Users can input data and generate conversion tables.

**Highlights:** SI to USCS/Imperial unit conversion, 18 major unit categories, Engineering and applied science focus, Data input and conversion, Conversion table generation, Gas flow rate conversion

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

**In-app purchases:** none


### Century HVAC Distributing

[App page](https://appshunter.io/ios/app/century-hvac-distributing/id1560720964)

This app provides HVAC trade professionals with tools for managing accounts, placing orders, and accessing technical information. It includes features for parts lookup, warranty registration, system building, and training class information.

**Highlights:** Account information viewing, Order placement with Scan to Cart, Parts Look Up, Technical Calculators, Warranty Look up and Registrations, System Builder with AHRI Match Ups, Training Class finder, Tech Videos

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SI To USCS unit Conversion free?

SI To USCS unit Conversion is free to download, with no in-app purchases.

### Is Century HVAC Distributing free?

Century HVAC Distributing is free to download, with no in-app purchases.

### Which has better reviews, SI To USCS unit Conversion or Century HVAC Distributing?

SI To USCS unit Conversion and Century HVAC Distributing are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do SI To USCS unit Conversion or Century HVAC Distributing have ads?

Century HVAC Distributing shows ads; SI To USCS unit Conversion does not.

### Which is updated more often, SI To USCS unit Conversion or Century HVAC Distributing?

SI To USCS unit Conversion ships an update every 10 months, and Century HVAC Distributing every 6 months. Most recently, SI To USCS unit Conversion was updated on October 30, 2026 and Century HVAC Distributing on October 9, 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.*