# Toothbrush timer vs Rivers 4K

The clearest difference is in-app purchases: Toothbrush timer at none against Rivers 4K's 2. Rivers 4K's advantage is update cadence (every 3 months vs every 9 months). On price, ads, device support and iOS requirement there is nothing between them.

Toothbrush timer costs $0.99 and Rivers 4K $0.99 up front. Rivers 4K sells 2 in-app purchases, starting at $0.99 per month. Toothbrush timer asks for nothing beyond the download.

Toothbrush timer ships an update every 9 months, Rivers 4K every 3 months. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Toothbrush timer | Rivers 4K |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Size | 194 MB | 60 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Grzegorz Kowalewski](https://appshunter.io/developer/570398280) | [KISSAPP, S.L.](https://appshunter.io/developer/552812711) |

## What reviewers say

### Toothbrush timer

[App page](https://appshunter.io/ios/app/toothbrush-timer-2-minutes/id1450972463)

**Features:** macOS Compatibility

**In-app purchases:** none


### Rivers 4K

[App page](https://appshunter.io/ios/app/rivers-4k/id6472048082)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rivers Full Version | $0.99 | per month |
| Rivers Full Version | $8.99 | per year |


## Frequently asked questions

### Is Toothbrush timer free?

Toothbrush timer costs $0.99, with no in-app purchases.

### Is Rivers 4K free?

Rivers 4K costs $0.99, and also offers in-app purchases.

### Do Toothbrush timer or Rivers 4K have ads?

Neither Toothbrush timer nor Rivers 4K shows ads.

### Which is updated more often, Toothbrush timer or Rivers 4K?

Toothbrush timer ships an update every 9 months, and Rivers 4K every 3 months. Most recently, Toothbrush timer was updated on November 7, 2026 and Rivers 4K 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.*