New in 1.15.0: • Solve for any input: set the result you want — a stress, a critical speed, an efficiency — and the app works the calculation backwards to the input that gives it. Available on 28 calculators. • Two new tools: Curved Beam in Bending, for hooks, C-frames and chain links, and Frames and Machines, for pinned structures the method of joints can't solve. • Your own materials everywhere: add, edit or copy fluids, thermal materials and composite laminae as well as solids, and manage them all in My Materials.

New in 1.14.0: • Shortcuts and widgets: convert units or open any calculator from Siri, Spotlight, the Shortcuts app or the Action button, and keep your favourite and recent tools on the Home Screen. • Premium unlocks every tool and removes ads on iPhone, iPad and Mac with one purchase — if you already removed ads, you have it. You can also unlock a single tool by watching one ad. • A new app icon, made for Liquid Glass. • The unit converter no longer shows a stray decimal point on round numbers in scientific notation.

New in 1.13.0: • New Thermodynamics tools: steam tables (IAPWS-IF97), ideal gas processes, the Otto, Diesel and Brayton cycles, and the Rankine cycle — with p–v and T–s diagrams. • On iPad, results now appear beside your inputs instead of on a page of their own. • Standard sections and composite presets fill in more calculators, and both fatigue tools draw the Goodman diagram. • History keeps your last 500 calculations.

New in 1.12.0: • Beam Load Analysis now covers six support arrangements — cantilever, overhang, propped and fixed-ended — with any number of point, distributed and moment loads. • New Bolt Grades & Torque reference: ISO 898-1 and SAE J429, with clamp load and tightening torque. • New Power Screw calculator: torque, efficiency and self-locking. • Japanese and Chinese PDF reports no longer drop characters.

New in 1.11.0: • Every tool now explains itself — tap ? in the app bar for what it computes, the formula, and how to read the result. In all six languages. • Tolerance stack-up: chain any number of dimensions, by worst-case and RSS. • Standard pipe schedules (ASME B36.10M, NPS 1/8–24) fill Reynolds Number and Pipe Pressure Drop. • Projects now hold several calculations and export as one PDF report.

New in 1.10.0: • Vibration — three new Machine Design tools: shaft critical speed, beam natural frequency across five end conditions, and torsional natural frequency for one or two rotors. • Fill a beam's natural frequency straight from a standard section. • Remove Ads now available on Android, with purchase restoration. • Faster launch and fixes to purchase restore.

New in 1.9.0: • Fluids & Thermal — a new category: Reynolds number, pipe pressure drop, pump and fan power, wall conduction, fin efficiency and heat exchanger sizing. • Standard Sections — AISC W, IPE and HEB shapes with full properties. Fill a beam straight from a section. • Built-in fluid and thermal material property lists. • Fixed PDF export in Chinese and Japanese. • This update requires iOS 15 or later.

New in 1.8.0: • Projects — save a calculation's inputs under a name and reopen them any time. • Export any result as a PDF report or a CSV file. • One share button, with a choice of format: text, image, PDF, or CSV. • Choose a light or dark appearance, or follow your device. • More of the app is translated, and search now works in every language. • Fixed a crash when naming a project.

New in 1.7.0: • Drill & tap chart — search any thread for its tap drill and clearance drill size. • ISO 286 fits & tolerances table — look up hole and shaft limits by diameter and fit. • Choose your app language from the side menu. • Now available in German, French, and Japanese.

New in 1.6.0: • New Machine Design calculators: springs, spur gears, shaft fatigue, bearing life, belt & chain drives, bolted joints, welds, and press fits. • Added composite failure criteria (Tsai-Hill & Tsai-Wu). • Smoother experience with animated tool icons and clearer illustrations. • Better tool recommendations by major.

New in 1.5.0: • New calculators: Mohr's Circle, Bolted Joint, Combined Loading, and Fatigue Safety Factor. • New Truss Analysis tool for 2D statics. • Switch between SI and Imperial units across calculators. • Find tools faster with major-based recommendations.

New in 1.4.0: • Analyze beams with new section-property and load-analysis tools, including engineering diagrams. • Enjoy a cleaner, responsive design with clearer list and grid views. • Remove ads permanently with a one-time purchase. • Improved keyboard behavior and advertising privacy controls.

New in 1.3.0: • Enhanced Calculation History: Now logs your specific input values for every calculation. • Smart Restore: Tapping a history record automatically pre-fills the calculator with your previous inputs. • Improved Layout: Reordered tool categories and optimized grid mode for better visibility on all devices. • Manage History: Swipe to delete individual history records. • Simplified Favorites: A cleaner, more focused list for your bookmarked tools.

New Calculators — Mechanics of Materials • Thermal deformation & stress (α, ΔT, L, E) • Transverse shear stress in beams (τ = VQ/It) • Angle of twist for circular shafts (φ = TL/GJ) • Shaft power & torque (find T or P from RPM) • Failure criteria — Von Mises & Tresca with factor of safety Calculation Steps Every result page now shows a full step-by-step breakdown: the formula, values substituted in, and the final result. Tap the card to copy the entire calculation to your clipboard. Share Results A share button on every result page lets you send the result and calculation steps via Messages, Mail, Notes, or any other app. Improvements • Composite material tools updated with thermal-elastic support • Rules of Mixture upgraded to transversely isotropic fiber model • Laminate 3D properties now shows full stiffness and compliance matrices

1. bug fixes.

1. App optimization

1. Add new languages.