# USG APP vs WEF RBTT 2026

The clearest difference is iOS requirement: USG APP at 13.4 against WEF RBTT 2026's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

USG APP ships an update fortnightly, WEF RBTT 2026 monthly. Both last shipped on October 28, 2026.

## The numbers

| Metric | USG APP | WEF RBTT 2026 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Size | 34 MB | 68 MB |
| Requires iOS | **13.4** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [USG United Scientific Group](https://appshunter.io/developer/1782302883) | [Water Environment Federation](https://appshunter.io/developer/611239406) |

## What reviewers say

### USG APP

[App page](https://appshunter.io/ios/app/usg-app/id6738779185)

**Features:** macOS Compatibility

**In-app purchases:** none


### WEF RBTT 2026

[App page](https://appshunter.io/ios/app/wef-rbtt-2026/id6741685590)

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

**In-app purchases:** none


## Frequently asked questions

### Is USG APP free?

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

### Is WEF RBTT 2026 free?

WEF RBTT 2026 is free to download, with no in-app purchases.

### Do USG APP or WEF RBTT 2026 have ads?

Neither USG APP nor WEF RBTT 2026 shows ads.

### Which is updated more often, USG APP or WEF RBTT 2026?

USG APP ships an update fortnightly, and WEF RBTT 2026 monthly. Most recently, USG APP was updated on October 28, 2026 and WEF RBTT 2026 on October 28, 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.*