TaskTetra vs Knock Reminder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TaskTetra
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TaskTetra is a ToDo app that divides a single screen into four sections, allowing you to manage four types of lists simply. Without the hassle of tab switching, page transitions, or complex tagging, you can complete your task management in a clear view. The names of each section can be customized according to your preference. Name the four sections "Urgent & Important", "Important, Not Urgent", "Urgent, Not Important" and "Neither", and you can use it as an Eisenhower matrix to sort your tasks by priority.
Knock Reminder
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In a meeting, you think "let me send that in 15 minutes" — but you don't have time for a multi-tap setup, so you set nothing and actually forget. The stock Reminders app takes four steps: open → tap + → pick a list → enter date and time. It's quietly long. And the notification gets buried with everything else — next thing you know, an hour's gone by. Knock Reminder exists to kill both of those: the hassle of setting a reminder, and the pain of missing it. For you if: You tend to say "later" and never actually set anything because the standard app is too much friction. Or you've been burned by missing a notification before. What it does: Pick from your own 16 custom presets and set a reminder in 3 taps. Repeats cover daily, weekly, monthly, yearly — weekly lets you toggle individual weekdays, so "just Monday, Wednesday, Friday" is one setting. Tap the notification and it switches instantly to a full-screen alert in your theme color — big clock, big name. No more losing it in the banner pile. Done, +15 min, or +1 hour, right there. We cut the seconds it takes to set one.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | TaskTetra | Knock Reminder |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 15 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | Koya Nambo | Seki Hiroyasu |
In-app purchases
TaskTetra
- Remove Ads$1.99
Knock Reminder
- Knock Reminder Pro$2.99
Questions
Is TaskTetra free?
Is Knock Reminder free?
Do TaskTetra or Knock Reminder have ads?
Which is updated more often, TaskTetra or Knock Reminder?
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