# Sensor Viewer vs HackUDC OS

The clearest difference is in-app purchases: HackUDC OS at none against Sensor Viewer's 2. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Sensor Viewer sells 2 in-app purchases, starting at $0.99 per year. HackUDC OS asks for nothing beyond the download.

## The numbers

| Metric | Sensor Viewer | HackUDC OS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Every 2 weeks |
| Size | 2 MB | 48 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Salisbury Apps](https://appshunter.io/developer/1095141053) | [GPUL](https://appshunter.io/developer/1874751084) |

## What reviewers say

### Sensor Viewer

[App page](https://appshunter.io/ios/app/sensor-viewer/id6765755753)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription | $0.99 | per year |
| One time / Lifetime purchase | $1.99 | one-time |


### HackUDC OS

[App page](https://appshunter.io/ios/app/hackudc-os/id6790912214)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sensor Viewer free?

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

### Is HackUDC OS free?

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

### Do Sensor Viewer or HackUDC OS have ads?

Neither Sensor Viewer nor HackUDC OS shows ads.

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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.*