Stairs 3D vs FabCalc

Build field-ready stair plans, inspect them in 3D, and export clean shop sheets — entirely offline, entirely on your device. Stairs 3D is a professional stair framing calculator for carpenters, contractors, deck builders, and serious DIY builders. Enter your total rise and target step count, and the app instantly solves the geometry: rise per step, tread depth, stair angle, stringer length, stringer cut patterns, and a complete materials list. All in millimeters or imperial, whichever you prefer. STAIR TYPES • Straight Stair — Single-flight layout with live rise, run, and angle. Free. • Stringer Layout — Board dimensions, cut geometry, and stringer count. Free. • Landing Stair — Two-flight layout around a framed platform. Pro. • L-Shaped & U-Shaped — Quarter-turn and return stairs with winder or landing options. Pro. • Spiral Stair — Helical stair with radial treads, center column, and rotation direction. Pro. WHAT YOU GET FOR EVERY STAIR • Live calculation — every input updates the result instantly • 3D visualization — orbit, inspect, and rotate a RealityKit model of your stair • 2D blueprint — annotated plan and elevation views with dimensions • Component inspector — tap any piece to see exact cut dimensions • Material cut list — auto-generated quantities ready for take-off • PDF export — printable blueprint for field, client, or shop use • CSV export — machine-readable material list for spreadsheets or procurement DESIGNED FOR THE JOB SITE No account. No network. No subscriptions that lock your own files away. Projects and exports stay on this device unless you explicitly share them. If you cancel a plan, your projects remain yours — viewable, editable, and exportable. Supports imperial (feet, inches, fractions) and metric (millimeters, centimeters). Configurable precision from whole numbers to four decimal places. PRIVACY Stairs 3D does not request camera, microphone, location, photo library, or tracking permissions. There are no analytics SDKs, no third-party data collection, and no advertising. The only external connection is the App Store for optional plan management. FREE VS. PRO Free includes straight stair calculation, stringer layout, 3D inspection, 2D blueprint, and project saving. Pro unlocks the landing, L-shaped, U-shaped, and spiral builders, plus PDF and CSV export. Pro is available as a monthly plan or annual plan. Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

The flat pattern calculator your fab shop needs — cylinders, cone gores, duct wraps, and more. Fully offline. No account. No ads. Stop laying out cone gores by hand on the table. Stop guessing developed length on a duct wrap. FabCalc generates shop-ready flat pattern drawings and 1:1 DXF files for common fabricated shapes. WHAT'S INSIDE • Cylinder wrap — full shell and partial segments • Half-pipe sleeve — 180° cylinder segments • Cone / frustum gore — annular sector with slant length and arc development • Rectangular duct wrap — four-panel strip with bend lines and bend allowance • Live 2D preview — cut profile, bend lines, roll direction, dimensions • DXF export — AutoCAD R12 ASCII, layered (CUT, BEND, ROLL, TEXT), 1:1 scale • PDF job sheet — drawing, inputs, calculated values, notes • Saved jobs — reopen and edit patterns locally WHO IT'S FOR Fabricators, sheet metal workers, pipe fitters, boilermakers, plasma/laser operators, and shop owners who need accurate flat patterns without desktop CAD. FREE vs PRO Free forever: all shape inputs, live preview, calculated values, warnings, and DXF cut-file export. Pro unlocks PDF job sheets and unlimited saved jobs. One-time purchase or subscription. Subscriptions auto-renew until cancelled. Manage in your Apple ID Subscription Settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://doublevision.company/privacy NO ACCOUNT. NO ADS. NO DATA COLLECTION. FabCalc works on the layout table, at the plasma table, in the truck. Everything runs locally.