# U vs Substation Digital

U and Substation Digital are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

U ships an update every 2 months, Substation Digital every 5 weeks. Both last shipped on November 4, 2026.

## The numbers

| Metric | U | Substation Digital |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 43 MB | 42 MB |
| Requires iOS | **13.0** | 13.4 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Intelitrack](https://appshunter.io/developer/1305245951) | [International Organization for Substations Digital Development POWER VIEW](https://appshunter.io/developer/1760809328) |

## What reviewers say

### U

[App page](https://appshunter.io/ios/app/u-install/id6476536989)

**In-app purchases:** none


### Substation Digital

[App page](https://appshunter.io/ios/app/substation-digital/id6599860006)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is U free?

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

### Is Substation Digital free?

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

### Do U or Substation Digital have ads?

Neither U nor Substation Digital shows ads.

### Which is updated more often, U or Substation Digital?

U ships an update every 2 months, and Substation Digital every 5 weeks. Most recently, U was updated on November 4, 2026 and Substation Digital on November 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.*