# Ninety - 90 minutes ToDo — Life with Ultradian Rhythm

> Life with Ultradian Rhythm (iPhone/iPad app by Imajin Kawabe.)

- Source: https://appshunter.io/ios/app/ninety-90-minutes-todo/id1436138776 (this page in markdown: same URL + `.md`)
- Developer: [Imajin Kawabe](https://appshunter.io/developer/1321285791)
- Category: Productivity, Lifestyle
- Price: Free
- Age rating: 4+
- Requires: iOS 11.4 · 14 MB
- Languages: English
- Released: 2018-09-17
- Data updated: 2026-07-28
- User reviews in markdown: https://appshunter.io/ios/app/ninety-90-minutes-todo/id1436138776/reviews.md

## What is Ninety?

"90 minutes" is the limit that human beings can keep their concentration, which is neuropsychologically called the Ultradian Rhythm.

So, why don't you divide your day into every 90 minutes to maximise your productivity?

Ninety is a task management application to boost your brain power.

This very simple single page App is for those who want to manage ToDo in every period of 90 minutes.

You just need to type your tasks into the period card.
Ninety notifies you the tasks for the next 90 minutes when the period begins.

Today, ToDo Apps are becoming more and more multifunctional, in other words, becoming complicating.

Ninety might be too simple. However, that is what we need.

Please enjoy your life with Ultradian Rhythm, and Ninety.

// This app was Co-created with Haluca Goto, King's College London.


## Version history (last 1 release)

### 1.0 — 2018-09-17

No release notes.

## Apps similar to Ninety

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Motion: Tasks & AI Scheduling](https://appshunter.io/ios/app/motion-tasks-and-ai-scheduling/id1580440623) | 4.1 (1,853) | Free | Productivity |
| [Flow: Focus & Pomodoro Timer](https://appshunter.io/ios/app/flow-focus-and-pomodoro-timer/id1423210932) | 4.8 (1,736) | Free | Productivity |
| [Voicenotes AI Notes & Meetings](https://appshunter.io/ios/app/voicenotes-ai-notes-and-meetings/id6483293628) | 4.8 (6,591) | Free | Productivity |
| [Blank Spaces Launcher](https://appshunter.io/ios/app/blank-spaces-launcher/id1570856853) | 4.6 (7,996) | Free | Productivity |
| [Reminder, Reminders with Voice](https://appshunter.io/ios/app/reminder-reminders-with-voice/id1071899483) | 4.7 (20,235) | Free | Productivity |
| [Cognitive & Sleep Ultradian](https://appshunter.io/ios/app/cognitive-and-sleep-ultradian/id6740084629) | — | Free | Productivity |

## More apps by Imajin Kawabe

- [ニシキゴイ - 俳句と写真のSNS](https://appshunter.io/ios/app/sns/id1321285792)
- [Poemy](https://appshunter.io/ios/app/poemy/id1475059338)
- [edaha](https://appshunter.io/ios/app/edaha/id1628011354)
- [Simple Recipe Keeper - Recipin](https://appshunter.io/ios/app/simple-recipe-keeper-recipin/id6458743097)

All apps by Imajin Kawabe: https://appshunter.io/developer/1321285791

## Related topics

[90minutos](https://appshunter.io/ios/topics/90minutos)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-28.*