# TaskTetra vs Knock Reminder

The clearest difference is ads: Knock Reminder at none against TaskTetra's shown. Knock Reminder also leads on update cadence (every 2 months vs every 4 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. TaskTetra sells 1 one-off in-app purchase and Knock Reminder sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

TaskTetra ships an update every 4 months, Knock Reminder every 2 months. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | TaskTetra | Knock Reminder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 months** |
| Size | 15 MB | 34 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Koya Nambo](https://appshunter.io/developer/1633778504) | [Seki Hiroyasu](https://appshunter.io/developer/6792599749) |

## What reviewers say

### TaskTetra

[App page](https://appshunter.io/ios/app/tasktetra-todo-management-app/id6460933735)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### Knock Reminder

[App page](https://appshunter.io/ios/app/knock-reminder/id6794741120)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Knock Reminder Pro | $2.99 | one-time |


## Frequently asked questions

### Is TaskTetra free?

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

### Is Knock Reminder free?

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

### Do TaskTetra or Knock Reminder have ads?

TaskTetra shows ads; Knock Reminder does not.

### Which is updated more often, TaskTetra or Knock Reminder?

TaskTetra ships an update every 4 months, and Knock Reminder every 2 months. Most recently, TaskTetra was updated on November 7, 2026 and Knock Reminder on October 31, 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.*