# 16 Relay Controller vs Stelock Tracker Pro

The clearest difference is iOS requirement: Stelock Tracker Pro at 13.0 against 16 Relay Controller's 18.6. On price, ads, in-app purchases and device support there is nothing between them.

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

## The numbers

| Metric | 16 Relay Controller | Stelock Tracker Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 34 months | — |
| Size | 0 MB | 57 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mike Henry](https://appshunter.io/developer/1219782847) | [AmirHossein Razavi](https://appshunter.io/developer/1329488966) |

## What reviewers say

### 16 Relay Controller

[App page](https://appshunter.io/ios/app/16-relay-controller/id1541478119)

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

**In-app purchases:** none


### Stelock Tracker Pro

[App page](https://appshunter.io/ios/app/stelock-tracker-pro/id6450203281)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 16 Relay Controller free?

16 Relay Controller is free to download, with no in-app purchases.

### Is Stelock Tracker Pro free?

Stelock Tracker Pro is free to download, with no in-app purchases.

### Do 16 Relay Controller or Stelock Tracker Pro have ads?

Neither 16 Relay Controller nor Stelock Tracker Pro 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.*