Fermi: Daily Estimation Quiz

Seven questions a day, one guess each. No googling: just back-of-the-envelope maths, good assumptions and a bit of intuition.

Fermi is a daily estimation game. We ask questions you can't know by heart but can reason your way to: how many people in Turkey are named Mehmet? How many ships passed through the Bosphorus in 2025? How many simits laid end to end would reach the Moon?

The game is in Turkish, with questions about Turkey and the world.

HOW TO PLAY
• Seven new questions every morning at 10:00 (Turkey time): everyday life, places and history, science and numbers.
• Type your guess and lock it in. One guess per question.
• See the answer right away, scored out of 100: spot on is 100, double or half is 85, ten times off is 50.
• Guessing too high or too low counts the same. Your daily score is the average.

EVERY ANSWER HAS A STORY
• Napkin maths shows how you could have estimated it, step by step.
• Every answer comes from official statistics or a reliable source, linked under the question.
• See where your guess landed among everyone else's.

COMPARE, SHARE, COLLECT
• Pick a nickname and climb the daily leaderboard.
• Share your result as a card or an emoji grid.
• Keep your streak alive and collect 11 badges.
• Your profile shows the last 14 days, your strongest topics and how close your answers were.

RECORD YOURSELF
• Record yourself while you guess: your face on top, the question and your score below, ready for Reels, TikTok and Shorts.
• Your face is centred automatically; drag and zoom to adjust it. Voice-only works too.

Built-in calculator and scratchpad, archive of past days, optional daily reminder, dark mode and VoiceOver.

PLAY WITH FRIENDS
• Add friends by username, invite link or QR code.
• Duels: 5 questions, 40 seconds each, the same questions for both of you. Win to raise your duel rating.
• Open duels: challenge anyone, or join someone else's.
• Groups: compare daily, weekly and monthly scores with family, class or colleagues.
• Topic practice: 5-question rounds in 10 topics.

FERMI PRO (OPTIONAL SUBSCRIPTION)
The daily puzzle is free for everyone. Pro adds unlimited duels and practice, groups of up to 100 with history, and detailed stats.
• Fermi Pro Aylık (monthly): 1-month auto-renewable subscription.
• Fermi Pro Yıllık (yearly): 1-year auto-renewable subscription; new subscribers get a 7-day free trial.
Prices are shown in the app before you buy. Payment is charged to your Apple ID when you confirm the purchase. The subscription renews automatically for the same length and price unless cancelled at least 24 hours before the end of the current period; manage or cancel it in Settings → Apple ID → Subscriptions.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://fermi.tr/gizlilik

PRIVACY
No tracking, and we never sell your data. Some days' puzzles have a sponsor, shown as a single line under the puzzle number. The daily puzzle needs no account; friends features use Sign in with Apple or e-mail. Profile photos are reviewed before they appear, and you can block or report any player.