# adhDO vs 99캘린더

The clearest difference is price: adhDO at Free against 99캘린더's $1.99. 99캘린더's advantage is in-app purchases (none vs 3) and update cadence (every 4 days vs every 5 weeks). On ads, device support and iOS requirement there is nothing between them.

adhDO is free to download; 99캘린더 costs $1.99 up front. adhDO sells 3 in-app purchases, starting at $1.99 per month. 99캘린더 asks for nothing beyond the download.

adhDO ships an update every 5 weeks, 99캘린더 every 4 days. The most recent releases landed on October 1, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | adhDO | 99캘린더 |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 4 days** |
| Size | 7 MB | 5 MB |
| Requires iOS | 17.5 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Alexey Demidov](https://appshunter.io/developer/1070504790) | [HWAN LEE](https://appshunter.io/developer/1867174500) |

## What reviewers say

### adhDO

[App page](https://appshunter.io/ios/app/adhdo-focus-for-messy-minds/id6532610193)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.99 | per month |
| Annual Subscription | $9.99 | per year |
| Lifetime Purchase | $29.99 | one-time |


### 99캘린더

[App page](https://appshunter.io/ios/app/99/id6760467468)

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

**In-app purchases:** none


## Frequently asked questions

### Is adhDO free?

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

### Is 99캘린더 free?

99캘린더 costs $1.99, with no in-app purchases.

### Do adhDO or 99캘린더 have ads?

Neither adhDO nor 99캘린더 shows ads.

### Which is updated more often, adhDO or 99캘린더?

adhDO ships an update every 5 weeks, and 99캘린더 every 4 days. Most recently, adhDO was updated on October 1, 2026 and 99캘린더 on October 25, 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.*