# WD Supervisor vs Track 91

The clearest difference is update cadence: Track 91 at every 4 days against WD Supervisor's monthly. 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.

WD Supervisor ships an update monthly, Track 91 every 4 days. The most recent releases landed on October 1, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | WD Supervisor | Track 91 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 38 MB | 45 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [WhistleDrive Pvt Ltd](https://appshunter.io/developer/1475468820) | [Vaishali C Peddintiwar](https://appshunter.io/developer/1424826187) |

## What reviewers say

### WD Supervisor

[App page](https://appshunter.io/ios/app/wd-supervisor/id6495973148)

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

**In-app purchases:** none


### Track 91

[App page](https://appshunter.io/ios/app/track-91/id6787424650)

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

**In-app purchases:** none


## Frequently asked questions

### Is WD Supervisor free?

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

### Is Track 91 free?

Track 91 is free to download, with no in-app purchases.

### Do WD Supervisor or Track 91 have ads?

Neither WD Supervisor nor Track 91 shows ads.

### Which is updated more often, WD Supervisor or Track 91?

WD Supervisor ships an update monthly, and Track 91 every 4 days. Most recently, WD Supervisor was updated on October 1, 2026 and Track 91 on October 9, 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.*