ThinkAbout vs OtterDay
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
ThinkAbout
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.
- Controlling content quizzes
- Professor-approved questions
- Business administration learning
- Specialized knowledge testing
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ThinkAbout ist eine Quiz-App, die beim Lernen - hier von Controlling-Inhalten - unterstützt. Die Fragen sind von Prof. Dr. Nicole Jekel, Professorin für Betriebswirtschaftslehre und Controlling an der Beuth Hochschule für Technik Berlin und Jury-Vorsitzende des Newcomer Awards des Internationalen Controller Vereins, freigegeben worden. Die Umsetzung über die Quiz-App erfolgt über Norman Uhlmann von der h3ko Vertriebsgesellschaft mbH, Berlin, der auch weitere Inhalte in Quiz-Apps für Sie gern umsetzt.
OtterDay
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.
- 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
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CAN YOU NAME THE WEEKDAY OF ANY DATE? OtterDay turns calendar calculation into a fast, satisfying logic game. Just as location-guessing games make geography feel playable, OtterDay does the same for dates. Learn a reliable mental method, practice it step by step, and work toward finding the weekday in five seconds—without checking a calendar. A SMART WORKOUT FOR YOUR BRAIN Every round challenges your logic, memory, number sense, and mental math. Short sessions keep your mind active while you build a practical skill that feels like a superpower: becoming a human calendar. LEARN, PRACTICE, MASTER Futuristic otter guides teach you the method one piece at a time. Start with recent dates, unlock wider ranges across centuries, and train until the calculation becomes second nature. WHY YOU'LL KEEP PLAYING • Guided lessons that explain the calendar method • Written and spoken-date challenges • Speed and precision training • Progress tracking and personal statistics • Achievements for accuracy, endurance, and fast answers • Flexible difficulty for quick practice or serious mastery MADE FOR CURIOUS MINDS OtterDay is designed for people who enjoy Sudoku, logic puzzles, mental math, number games, brain training, and learning clever systems. The method is related to John Conway's Doomsday Algorithm, presented as a focused puzzle adventure rather than a dry lesson. Keep your mind active. Sharpen your logic. Master the calendar—and see how close you can get to five seconds.
Screenshots
Verdict
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.
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. 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.
| Parameter | ThinkAbout | OtterDay |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 8.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 64 MB | 162 MB |
| Age rating | 17+ | 4+ |
| Developer | h3ko Innovations GmbH | Felix Manuel Plagge |
Customer experience
ThinkAbout
OtterDay
In-app purchases
ThinkAbout
No in-app purchases
OtterDay
- Core$5.99
- Core To Pro$5.99
- Pro$6.99









