# Toothbrush Timer | Nubo AI vs Brush Rainbow

The clearest difference is update cadence: Toothbrush Timer | Nubo AI at every 4 days against Brush Rainbow's every 2 weeks. Toothbrush Timer | Nubo AI also leads on iOS requirement (15.1 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Toothbrush Timer | Nubo AI sells 2 in-app purchases, starting at $4.99 per month and Brush Rainbow sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Toothbrush Timer | Nubo AI ships an update every 4 days, Brush Rainbow every 2 weeks. The most recent releases landed on October 6, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Toothbrush Timer | Nubo AI | Brush Rainbow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Size | 169 MB | 41 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Muhammed Bahra YILMAZ](https://appshunter.io/developer/1826293033) | [Toshiaki Nakamura](https://appshunter.io/developer/822485897) |

## What reviewers say

### Toothbrush Timer | Nubo AI

[App page](https://appshunter.io/ios/app/toothbrush-timer-nubo-ai/id6748560710)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $4.99 | per month |
| Yearly Premium | $29.99 | per year |


### Brush Rainbow

[App page](https://appshunter.io/ios/app/brush-rainbow-brushing-guide/id6796295984)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support, iPhone Duo support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rainbow Brushing Monthly | $0.99 | per month |
| Rainbow Brushing Annual | $5.99 | per year |
| Rainbow Brushing Lifetime | $11.99 | one-time |


## Frequently asked questions

### Is Toothbrush Timer | Nubo AI free?

Toothbrush Timer | Nubo AI is free to download, with in-app purchases available.

### Is Brush Rainbow free?

Brush Rainbow is free to download, with in-app purchases available.

### Do Toothbrush Timer | Nubo AI or Brush Rainbow have ads?

Neither Toothbrush Timer | Nubo AI nor Brush Rainbow shows ads.

### Which is updated more often, Toothbrush Timer | Nubo AI or Brush Rainbow?

Toothbrush Timer | Nubo AI ships an update every 4 days, and Brush Rainbow every 2 weeks. Most recently, Toothbrush Timer | Nubo AI was updated on October 6, 2026 and Brush Rainbow on November 8, 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.*