Fermi: Daily Guessing Game

Estimate anything in 3 minutes

Free · In-App Purchases · Designed for iPad. Not verified for macOS.

Fermi is a daily game about getting close. Every morning you get three questions nobody can answer off the top of their head. How many baguettes do the bakeries of Paris sell before noon? How many trees are standing on Earth right now? You don't look it up. You break the problem into pieces you already know, follow a hunch, and put a number on it. Then you find out how close you landed. HOW IT WORKS • Three questions. About three minutes. • One number per question — no multiple choice, no second tries. • Your score is the multiple between your answer and the truth. 1x is spot on. Lower is better. • See where your number sits against everyone else who played today. WHY IT'S DIFFERENT Most quiz apps reward what you already memorised. This one rewards how you think. The physicist Enrico Fermi was famous for landing within an order of magnitude of almost anything using nothing but reasoning — how many piano tuners work in Chicago, how much energy a blast released judging by how far the paper scraps flew. That is the skill this app trains, and it gets sharper the more you use it. WHAT YOU GET • A fresh set of three questions every morning • A daily leaderboard, plus weekly and monthly standings • Your personal best and a running history of every round • An archive of past days, open whenever you want another round • The sources behind every answer, so you can see where the number came from • Metric or imperial units, your choice No sign-up, no email address, no ads in the middle of a question. Your first round is free; a subscription unlocks every daily round, the archive and the working behind every answer. Come back tomorrow. There is always another one. Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://fermi.begtools.xyz/privacy Questions or feedback: cytools85@gmail.com

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Ratings & Reviews

  • 5.0
    out of 5
    1 Ratings

A redesigned, full-screen subscription page, plus small fixes and polish.

Version 1.0.4

The developer, ZEYNEP CEREN GEMICI, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Size
    45.5 MB
    Category
    Trivia
    Compatibility
    Requires iOS 16.4 or later.
    • iPhone
      Requires iOS 16.4 or later.
    • iPad
      Requires iPadOS 16.4 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 4 more
    • English, Dutch, German, Spanish, Turkish
    Age Rating
    4+
    In-App Purchases
    Yes
    • Fermi Subscriber Annual 39,99 €
    • Fermi Subscriber Weekly 6,99 €
    • Learn More
    Provider
    ZEYNEP CEREN GEMICI
    • ZEYNEP CEREN GEMICI has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
    • Address
      Bulent Ecevit
      Yesim apartmanı
      35000 Izmir
      izmir Türkiye
    • Phone Number
      +90 5520692364
    • Email
      gemicizeynepceren@gmail.com
    Copyright
    2026 © Zeynep Ceren Gemici
  • Privacy Policy

    • More by ZEYNEP CEREN GEMICI

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