Engineering Formulas vs Problems

EngiRef is the all-in-one engineering reference app that works 100% offline. Access formulas, material properties, reference tables, and a powerful unit converter - all without internet connection. FORMULA LIBRARY Browse 140+ essential engineering formulas organized by discipline: • Mechanical Engineering: stress, strain, torque, power, gear ratios, spring design • Electrical Engineering: Ohm's law, AC/DC circuits, impedance, resonance • Civil/Structural: beam deflection, Euler buckling, Manning's equation • Thermodynamics: ideal gas law, Carnot efficiency, heat transfer • Fluid Mechanics: Bernoulli, Reynolds number, Darcy-Weisbach • Materials Science: Young's modulus, Poisson's ratio, fatigue analysis BUILT-IN CALCULATOR Enter your values and get instant results. Every calculation shows step-by-step solutions so you understand the process, not just the answer. Perfect for learning and exam preparation. MATERIALS DATABASE Access properties for 55+ engineering materials: • Carbon steels (AISI 1018, 1045, 4140, 4340) • Stainless steels (304, 316, 17-4 PH) • Aluminum alloys (6061-T6, 7075-T6, 2024-T3) • Titanium, copper, nickel alloys • Plastics (ABS, HDPE, Nylon, PEEK, Delrin) • Composites, concrete, and wood Compare up to 3 materials side-by-side with density, tensile strength, elastic modulus, thermal conductivity, and more. REFERENCE TABLES • Bolt specifications: Metric M3-M36, SAE/Imperial sizes • Pipe schedules: NPS dimensions and wall thickness • Wire gauges: AWG 0000-40 with ampacity ratings UNIT CONVERTER Convert between 16 categories including length, pressure, temperature, force, energy, flow rate, and viscosity. Accessible from any screen via slide-over panel. PHYSICAL CONSTANTS Quick reference for 34 constants including speed of light, gravitational constant, Boltzmann constant, Avogadro's number, and more. QUIZ MODE Test your knowledge with flashcard-style quizzes. Track progress across all disciplines. Prepare for FE and PE exams. ADDITIONAL FEATURES • Dark and light themes (follows system setting) • Favorites to bookmark frequently used formulas • Calculation history with timestamps • Create and save custom formulas • Export and share your data • LaTeX formula rendering • iPad-optimized layouts PRIVACY FOCUSED EngiRef collects zero personal data. No analytics, no ads. All your calculations and favorites stay on your device. We believe engineering tools should respect your privacy. Whether you are a student preparing for exams, a working engineer needing quick field reference, or a technician looking for material specs, EngiRef puts essential engineering knowledge in your pocket. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Four fresh puzzles. One daily habit. Turn a spare moment into a satisfying challenge with Problems.cc. Play daily math games, explore past puzzles and build your problem-solving skills one small discovery at a time. FIND YOUR FAVORITE GAME • Crossnumber: a crossword with numbers. Follow interlocking Across and Down clues to deduce the digits. • Magic Square: every line, one magic sum. Make the rows, columns and diagonals add up to the same total. • Summit: small numbers, big possibilities. Choose the operations that reach the target. • Cryptarithm: letters hide, numbers reveal. Give each letter a unique digit to make the equation work. MAKE MATH CLICK Sign in for personalized Practice: a daily set of problems matched to your math rating. Work through multiple-choice and numeric questions. Ask George for hints and follow-up explanations in an optional problem chat, and type or dictate your answer. You review dictated text before submitting it. Chat and some answer checking use OpenAI, with your permission. SEE HOW FAR YOU'VE COME Your Profile brings your math rating, streaks and activity together. Daily games build your playing habit; rated Practice answers shape your math rating. MADE FOR YOUR DAILY BRAIN BREAK • Four fresh math games every day. • An Archive of past puzzles to explore. • Puzzle progress saved as you play, so you can pick up where you left off. • Optional sign-in to sync progress across devices. • Light and dark appearances, rotation and adaptive layouts on iPhone and iPad. • No ads. No account needed for daily games. From Exact Science, the team behind problems.cc. Open today's puzzles and find your next bright idea.