# ThinkAbout vs OtterDay

The clearest difference is in-app purchases: ThinkAbout at none against OtterDay's 3. ThinkAbout also leads on ads (none vs shown) and iOS requirement (8.0 vs 15.6). OtterDay's advantage is update cadence (every 2 weeks vs every 2 months). On price, review sentiment and device support there is nothing between them.

Both are free to download. OtterDay sells 3 one-off in-app purchases. ThinkAbout asks for nothing beyond the download.

ThinkAbout ships an update every 2 months, OtterDay every 2 weeks. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ThinkAbout | OtterDay |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/otterday-calendar-logic-game/id6747994124/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 64 MB | 162 MB |
| Requires iOS | **8.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [h3ko Innovations GmbH](https://appshunter.io/developer/1143540818) | [Felix Manuel Plagge](https://appshunter.io/developer/1823761397) |

## What reviewers say

### ThinkAbout

[App page](https://appshunter.io/ios/app/thinkabout-controlling/id1472043575)

This quiz app aids in learning controlling concepts. Questions are approved by a professor of business administration and controlling. It offers a way to test your knowledge in this specialized field.

**Highlights:** Controlling content quizzes, Professor-approved questions, Business administration learning, Specialized knowledge testing

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

**In-app purchases:** none


### OtterDay

[App page](https://appshunter.io/ios/app/otterday-calendar-logic-game/id6747994124)

Learn to quickly calculate the day of the week for any date using a mental superpower. Engage in a puzzle adventure with otter guides, mastering the "date trick" through interactive challenges and tracking your progress.

**Highlights:** Interactive otter guides, Learn the date trick step-by-step, Two game modes: written and spoken dates, Achievements for speed and precision, Progress tracking for streaks and times, Works for dates from 1750 to the far future

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Core | $5.99 | one-time |
| Core To Pro | $5.99 | one-time |
| Pro | $6.99 | one-time |


## Frequently asked questions

### Is ThinkAbout free?

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

### Is OtterDay free?

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

### Do ThinkAbout or OtterDay have ads?

OtterDay shows ads; ThinkAbout does not.

### Which is updated more often, ThinkAbout or OtterDay?

ThinkAbout ships an update every 2 months, and OtterDay every 2 weeks. Most recently, ThinkAbout was updated on October 9, 2026 and OtterDay 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.*