# NOS Trailing vs WPP K9 Tracker

The clearest difference is in-app purchases: WPP K9 Tracker at none against NOS Trailing's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. NOS Trailing sells 2 in-app purchases, starting at $1.99 per month. WPP K9 Tracker asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 11, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | NOS Trailing | WPP K9 Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Size | 32 MB | 83 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Pawel Krugiolka](https://appshunter.io/developer/6775884807) | [Patryk Binieda](https://appshunter.io/developer/6784594315) |

## What reviewers say

### NOS Trailing

[App page](https://appshunter.io/ios/app/nos-trailing/id6775884805)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $1.99 | per month |
| Yearly Premium | $14.99 | per year |


### WPP K9 Tracker

[App page](https://appshunter.io/ios/app/wpp-k9-tracker/id6784594313)

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

**In-app purchases:** none


## Frequently asked questions

### Is NOS Trailing free?

NOS Trailing is free to download, with in-app purchases available.

### Is WPP K9 Tracker free?

WPP K9 Tracker is free to download, with no in-app purchases.

### Do NOS Trailing or WPP K9 Tracker have ads?

Neither NOS Trailing nor WPP K9 Tracker shows ads.

### Which is updated more often, NOS Trailing or WPP K9 Tracker?

NOS Trailing ships an update weekly, and WPP K9 Tracker weekly. Most recently, NOS Trailing was updated on October 11, 2026 and WPP K9 Tracker 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.*