Fronda

Fronda trains you to estimate big numbers 🔢 by building them from simple ✨ factors. Fronda is an estimation trainer. It asks questions with numbers 🔢 you cannot look up, such as how many windows are in an office tower. You work out the answer yourself, one factor at a time ⏱️. Build 🔨 an estimate from your own chain of factors. Name each factor, set its size with a power-of-ten stepper and a fine dial, and watch 👀 the running product update in plain words. Add, edit, reorder or remove factors as you go. When you lock in an answer, the app 📱 scores it on a logarithmic scale and tells you whether you came in high or low. Then it shows a worked solution next to yours, factor by factor, and points out the step that cost you the most. You can adopt a reference factor and see 👀 your score 🔢 change right away. What you can do in Fronda: - Try a new ✨ estimate each day, or pick from a bank of 96 problems in three domains - Place five real quantities on a powers-of-ten ladder and see 👀 where each one belongs - Browse reference quantities and order three of them from largest to smallest - Track your habitual lean, whether you tend to guess high or low - Dial in a correction and preview how your last estimates would have scored - Drill one domain with a run of five problems - Retry your weakest answers later - Make your own problem from a scene you count by hand Fronda works offline 📴 and needs no account. Use it to get a better feel for how big things really are.