All tools
Education & Science
Learning, exams, grades and scientific references
4 free tools — no ads, no sign-up, everything runs in your browser.
Exam & Section Timer
Plan multi-section exams with total duration and seconds-per-question pacing.
Flashcards & Spaced Repetition
Review a flashcard with a transparent SuperMemo SM-2 scheduling algorithm.
GPA & Grade Calculator
Calculate credit-weighted GPA and simulate the semester average needed for a target.
Interactive Periodic Table
Explore all 118 elements, filter them and preview phase changes by temperature.