Learn / Play
Scale Sense
Translate any big number into real-world equivalents — 245 cross-continent landmarks and everyday anchors as your scale references
Learn / Browse
Learning Tools
Practice vocabulary, visualize algorithms, explore concepts — learn by doing, right in your browser.
Browse Learning Tools
Interactive tools designed to make learning engaging and hands-on.
Learn / Play
Sundial Simulator
An interactive sundial for understanding solar geometry — adjust latitude and date to watch shadows move.
Learn / Play
Chengyu Guess
A daily four-character Chinese idiom guessing game with a multi-layer hint system. Six tries to crack the hidden idiom.
Learn / Education
Forgetting Curve Vocab
Learn English vocabulary using Ebbinghaus forgetting curve spaced repetition. 5 minutes a day with pronunciation and example sentences.
Frequently Asked Questions
What learning tools are available?
Spaced-repetition vocabulary drills and more interactive learning tools coming soon including algorithm visualizers and logic trainers.
Does progress save between sessions?
Yes. Learning progress is saved in your browser's local storage so you can pick up where you left off.