Physics Formulas vs ScholarHack

PhysRef is the complete physics formula reference designed for students, engineers, and science enthusiasts. Access hundreds of formulas, physical constants, and built-in calculators - all without internet connection. COMPREHENSIVE FORMULA DATABASE Browse formulas organized by topic: Mechanics, Thermodynamics, Waves, Electricity and Magnetism, Optics, and Modern Physics. Each formula includes variable definitions, units, and related concepts. BUILT-IN CALCULATORS Stop doing manual calculations. Enter your known values and instantly compute the unknown variable. Every calculator validates inputs and displays results with appropriate units. PHYSICAL CONSTANTS TABLE Quick access to fundamental constants including speed of light, gravitational constant, Planck's constant, electron mass, Boltzmann constant, and dozens more. All values use standard reference data. UNIT CONVERTER Convert between units across 14 categories: length, mass, time, velocity, acceleration, force, energy, power, pressure, temperature, electric charge, electric current, angle, and frequency. PERSONAL NOTES Add your own notes to any formula. Perfect for exam prep, recording problem-solving strategies, or marking formulas you find tricky. FORMULA DERIVATIONS Understand where formulas come from. See step-by-step derivations that connect fundamental principles to the equations you use. WORKS COMPLETELY OFFLINE All content is bundled in the app. Study on airplanes, in basements, or anywhere without signal. No account required. No internet needed. DESIGNED FOR STUDENTS Covers content from AP Physics 1, AP Physics 2, AP Physics C, IB Physics, and introductory university physics courses. Whether you are preparing for an exam or solving homework problems, PhysRef has you covered. PRIVACY FIRST Your data stays on your device. We do not collect personal information. No tracking. No analytics. No ads. FEATURES SUMMARY - Formula browser organized by physics topic - Search by formula name, variable, or concept - Calculators for solving problems - Physical constants with precise values - Unit converter with 14 categories - Personal notes on any formula - Formula derivations and explanations - Related formulas and connections - Bookmarks for quick access - Search history - Dark and light themes - 100% offline functionality Built for physics students who want a reliable, ad-free reference that works anywhere. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

ScholarHack helps you master the vocabulary that matters most for the SAT Reading & Writing section — no fluff, just the highest-value words students actually need. PRACTICE THAT ADAPTS TO YOU Every session focuses on the words you're weakest on, using a mastery system that tracks your progress from Learning to Mastered. Miss a word and you'll see it again soon. Nail it twice in a row and it moves out of your way so you can focus on what still needs work. WORD BUILDING: LEARN THE PATTERNS, NOT JUST THE WORDS Go beyond memorization with prefix and root practice. Once you know that ambi- means "both" or that -dict- means "say," dozens of unfamiliar SAT words suddenly make sense. SPEED CHALLENGES & DUELS Test yourself under time pressure, or go head-to-head with a friend in real-time vocabulary duels. TRACK REAL PROGRESS See your streak, your accuracy, and exactly how many words you've moved from Learning to Mastered — not just a vague completion percentage. Whether you're starting SAT prep from scratch or doing a final review before test day, ScholarHack gives you a focused, no-nonsense way to build the vocabulary that actually shows up on the exam.