Learn by Building

Sentence Builder lets you compose English sentences through interactive block-based interface. Discover grammar not by memorizing rules, but by playing with them.

Powerful Grammar Engine

Behind the scenes, a powerful grammar engine—similar to HPSG—guides sentence formation and ensures everything you make is grammatically valid.

Made for Learners

Designed especially for learners from languages like Japanese, our app helps you internalize English through structure, intuition, and exploration—not translation or drills.