Physics Formulas vs Грамота

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/

Грамота (Gramota) is an on-device proofreader for Russian that runs entirely on your iPhone, iPad, or Mac. Native speakers often write "by ear" — and small grammar and spelling slips are easy to miss. Грамота catches and fixes them in seconds, without ever sending your text to a server. PRIVATE BY DEFAULT • The model runs locally on your device. • Your text is never uploaded or stored in the cloud. • Works fully offline. CATCHES WHAT'S EASY TO MISS • Spelling, soft-sign endings, and easily confused letters. • Punctuation, typos, and word agreement. RIGHT FROM THE SHARE MENU • Select text in any app → Share → Грамота. • Get the corrected version and copy it with one tap. • Long passages open in the app with live progress. SEE WHAT CHANGED • Corrections are highlighted, and a writing score shows how clean your text is. One app for iPhone, iPad, and Mac. Note: Грамота corrects grammar and spelling — it doesn't rewrite style or replace careful review. For important text, double-check meaning, names, and numbers yourself. Note: This model operates entirely on your device. The older your device, the longer it will take to obtain a result, but rest assured, you will receive a result!