# United Supply vs SerialCheck

The clearest difference is in-app purchases: United Supply at none against SerialCheck's 3. SerialCheck's advantage is update cadence (every 3 weeks vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. SerialCheck sells 3 in-app purchases, starting at $0.99 per month. United Supply asks for nothing beyond the download.

United Supply ships an update every 4 months, SerialCheck every 3 weeks. The most recent releases landed on September 24, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | United Supply | SerialCheck |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Size | 25 MB | 37 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [Billtrust](https://appshunter.io/developer/1454713057) | [NanoHawk](https://appshunter.io/developer/1805616299) |

## What reviewers say

### United Supply

[App page](https://appshunter.io/ios/app/united-supply/id6477546334)

**Features:** macOS Compatibility

**In-app purchases:** none


### SerialCheck

[App page](https://appshunter.io/ios/app/serialcheck-hvac-age-decoder/id6759895640)

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SerialCheck Pro Monthly | $0.99 | per month |
| SerialCheck Pro Annual | $3.99 | per year |
| SerialCheck Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is United Supply free?

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

### Is SerialCheck free?

SerialCheck is free to download, with in-app purchases available.

### Do United Supply or SerialCheck have ads?

Neither United Supply nor SerialCheck shows ads.

### Which is updated more often, United Supply or SerialCheck?

United Supply ships an update every 4 months, and SerialCheck every 3 weeks. Most recently, United Supply was updated on September 24, 2026 and SerialCheck on October 4, 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.*