# Mark6 Reminder vs On99

The clearest difference is ads: On99 at none against Mark6 Reminder's shown. On99 also leads on update cadence (every 5 days vs every 6 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Mark6 Reminder ships an update every 6 weeks, On99 every 5 days. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Mark6 Reminder | On99 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 5 days** |
| Size | 37 MB | 70 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 17+ | 17+ |
| Developer | [Heung Kai Chan](https://appshunter.io/developer/1569414929) | [Ho Ngai Chan](https://appshunter.io/developer/467067681) |

## What reviewers say

### Mark6 Reminder

[App page](https://appshunter.io/ios/app/mark6-reminder/id6744552226)

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

**In-app purchases:** none


### On99

[App page](https://appshunter.io/ios/app/on99-mark-six-your-way/id6783656236)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Mark6 Reminder free?

Mark6 Reminder is free to download, with no in-app purchases.

### Is On99 free?

On99 is free to download, with no in-app purchases.

### Do Mark6 Reminder or On99 have ads?

Mark6 Reminder shows ads; On99 does not.

### Which is updated more often, Mark6 Reminder or On99?

Mark6 Reminder ships an update every 6 weeks, and On99 every 5 days. Most recently, Mark6 Reminder was updated on October 9, 2026 and On99 on October 24, 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.*