# Kigen ~ penguin task tracker vs Dueday

The clearest difference is in-app purchases: Dueday at none against Kigen ~ penguin task tracker's 3. Dueday also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Kigen ~ penguin task tracker sells 3 one-off in-app purchases. Dueday asks for nothing beyond the download.

Kigen ~ penguin task tracker ships an update every 9 days, Dueday every 2 weeks. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Kigen ~ penguin task tracker | Dueday |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 20 MB | 25 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Taito Iikura](https://appshunter.io/developer/1506013840) | [Yuki Okawa](https://appshunter.io/developer/1867195492) |

## What reviewers say

### Kigen ~ penguin task tracker

[App page](https://appshunter.io/ios/app/kigen-penguin-task-tracker/id6477283404)

This app helps you manage tasks and meet deadlines with a simple interface. It uses color-coded indicators for due dates and a punctuality level system to motivate users. Receive timely notifications to stay on track.

**Highlights:** Task title, note, due date, and importance entry, Color-coded due date status indicators, Punctuality level system for motivation, Customizable deadline notifications, Simple task completion marking

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support Kigen App | $1.99 | one-time |
| Support Kigen App | $4.99 | one-time |
| Ads Free Plan | $14.99 | one-time |


### Dueday

[App page](https://appshunter.io/ios/app/dueday-deadline-countdown/id6785360681)

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

**In-app purchases:** none


## Frequently asked questions

### Is Kigen ~ penguin task tracker free?

Kigen ~ penguin task tracker is free to download, with in-app purchases available.

### Is Dueday free?

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

### Do Kigen ~ penguin task tracker or Dueday have ads?

Kigen ~ penguin task tracker shows ads; Dueday does not.

### Which is updated more often, Kigen ~ penguin task tracker or Dueday?

Kigen ~ penguin task tracker ships an update every 9 days, and Dueday every 2 weeks. Most recently, Kigen ~ penguin task tracker was updated on November 4, 2026 and Dueday on November 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*