More tools

Separate sites, each one for a different subject. Each description is the site's own.

• CalcRefCalcRef is a browser-native calculus reference: the full formula database, topic browsing, search, favorites, practice prompts and unit conversion.
• StatRiseStatistics calculators, lessons, practice, simulations, formulas, and browser-local progress for intro stats and AP Statistics.
• ScoreMintPractice for the SAT®, AP®, and ACT® exams with per-choice explanations, timed sections, spaced review, and progress tracking.
• TrigonifyBrowser-native trigonometry reference: 45 identities and formulas across 16 topics, an interactive unit circle, a triangle solver, quizzes and practice.
• SyntaxShelfTask-first code cheat sheets for 11 stacks and 1,271 entries.

Looking for something on this site instead? The topics, the reference and the guides are the places most visitors start.