ひたすら積分 vs Euclid Lab

Practice Integration is a focused learning app designed specifically for mastering integrals. If you struggle with integration or want to build speed and confidence through repetition, this app provides a simple, distraction-free experience focused entirely on practice. The app includes both a 10-Question Time Attack Mode and an Endless Mode, allowing you to practice quickly during short breaks or spend more time improving your skills. With Easy and Hard difficulty levels, it is suitable for learners who are just starting with integration as well as those who want to improve their calculation speed and accuracy. Features • Practice integration exclusively • 10-Question Time Attack Mode • Endless Practice Mode • Easy / Hard difficulty settings • Simple and intuitive interface • Designed for quick practice sessions Move from understanding integration to solving problems with confidence. Perfect for anyone who wants to master integrals through consistent repetition and practice.

Explore the 48 propositions of Book I of Euclid’s Elements through reading, construction and proof practice. Euclid Lab separates proposition reading, straightedge-and-compass work and reasoning so you can focus on one activity at a time. Arrange supplied proof blocks to connect premises to conclusions. Scored exercises use semantic checks of geometric relationships and logical dependencies, not the appearance of a drawing or AI grading. Progressive hints and complete solutions, shown on request, help when you get stuck. I.7 currently offers unscored reading, exploration and notes. Freehand notes are also unscored and are not automatically verified as correct proofs. Foundations and I.1–I.12 are free. I.13–I.24 and I.25–I.48 are separate, one-time in-app purchases. Buying one pack does not unlock the other. No subscription is required. Learning progress and notes are stored locally on your device. Learner profiles are not Apple Accounts, and no Euclid Lab account registration is required. Restore Purchases restores eligible content access; it does not synchronize learning progress.