PhysicsCalc vs Грамота

PhysicsCalculator is your pocket physics assistant. 126 formulas across 6 sections: mechanics, thermodynamics, electromagnetism, optics, oscillations & waves, and modern physics. FREE: • 56+ formulas — 2 from each subsection • Smart calculation — select the unknown variable, enter the rest, get instant results • Step-by-step solutions — detailed breakdown of every calculation • Unit converter — 13 categories, 80+ units of measurement • Physical constants — speed of light, Planck's constant, and more • History — all your calculations at your fingertips • 6 languages — English, Russian, German, Spanish, French, Chinese • Dark mode — comfortable work in any environment PREMIUM — ONE-TIME PURCHASE: • All 126 formulas — from high school to university level • Dependency graphs — visualize how one quantity depends on another • Error calculator — error propagation using partial derivatives • Favorites — save important calculations • PDF export — share your results PHYSICS SECTIONS: ▸ Mechanics — kinematics, dynamics, conservation laws, statics ▸ Thermodynamics — gas laws, heat transfer, molecular physics ▸ Electromagnetism — Coulomb's law, Ohm's law, electromagnetic induction ▸ Optics — refraction, lenses, diffraction ▸ Oscillations & Waves — pendulum, wave equation, sound ▸ Modern Physics — photoelectric effect, atomic physics, nuclear reactions The app is fully offline — no internet required, no data collected. Perfect for students, teachers, and physics enthusiasts.

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!