Pecka Sosen

Train your estimates: set a low and high bound and check ✅ how sure you can be. Pecka Sosen is a trainer for estimating numbers 🔢 and knowing how sure you are. Every question asks for a quantity, such as how many breaths an adult takes in a day or how old the universe is. You do not pick from four buttons. You drag ✋ a low end and a high end along a band, then say how confident you are. A narrow bracket that still holds the answer scores best. A wide bracket or a miss costs points. After each answer you see 👀 where the true value falls, a plain score 🔢 breakdown 🧾, and a short note 📝 that explains the real figure. At the end of a round you get your points, how many brackets held the answer, and your median bracket width. What you can do in the app 📱: - Play ▶️ a daily set of five questions and follow your seven-day streak 🔥. - Set up your own round: choose from six topics, pick Everyday, Stretch or Brutal questions, and play ▶️ 5, 10 or 15 at a time ⏱️. - Lock your confidence at 90% to skip that step on every question. - Use "Narrow for me" when you are stuck, or skip a question. - Open the calibration report 🧾 to compare ⚖️ your stated confidence with your real hit rate. - Read an overconfidence reading and a chart 📊 of your bracket width over recent rounds. - Work through Fermi chains. Break a big question into factors, set each one with power-of-ten steppers, and watch 👀 the running product update. - See 👀 how close your chain lands to the accepted answer, factor by factor, with a star rating. - Review the questions you missed or flagged, and look back over past rounds in your history ⏳. The calibration report 🧾 is built from your own answers, so it gets more useful the more you play ▶️. Pecka Sosen works without an account. If you want to get better at guessing and at judging your own guesses, Pecka Sosen gives you a short daily practice 🏋️ to do it.