Estimator Quiz

How good are you at guessing numbers? About 1,350 questions across Science, History, Industry, Fine Arts and Entertainment, scored by how close your estimate is on a logarithmic scale, with a shared leaderboard.

▶ Open the live app · works on phone and laptop

Features

• Estimation mode: type your best guess and score up to 1,000 points per question, based on how many "orders of magnitude" you are off (percentage questions use their own 100-point scale).
• Daily Quiz: the same 5 questions for everyone each day, one try, with a share button and a leaderboard for the day.
• Accounts (email or Google) that keep your daily history and past tests across devices.
• Tests of 10, 20 or 30 questions, with no repeats on your device until you've seen them all.
• Self-balancing difficulty: every question tracks how people score on it and gently adjusts its own difficulty to match the overall average.
• Shared leaderboard.
• Report a question if it's vague, too obscure or looks wrong.
• Info tab explaining the scoring formula with examples.

Built with

A single HTML file (plain HTML, CSS and JavaScript, no build step) hosted on GitHub Pages, with questions, stats and leaderboards in a Firebase Realtime Database (free plan). The database rules live in database.rules.json: anyone can read, but players can only add answers, reports and leaderboard entries, never edit or delete questions.