StairSmith
Stair calculator. No subs.
$6.99 · Designed for iPad. Not verified for macOS.
The fastest stair calculator on iOS. Live diagram, instant code compliance, print-ready PDF cut sheet. No subscription, no ads, yours forever.
The stair calculator built for builders and DIYers.
Type your total rise. StairSmith equalizes the risers, draws the elevation diagram live, runs the building-code checks, and tells you what to cut instantly. No account, no cloud, no subscription.
HERO FEATURES
• Live elevation diagram — pinch, pan, tap any dimension to learn what it means.
• Cut Sheet hero — riser height, code going, riser count, stringer length. Take it to the saw.
• Lumber cheat sheet — number of stringers, treads, and risers, with stringer length rounded to the next standard 2×12.
• Framing-square layout — "set tongue at 7", blade at 10"" with a beautiful, printable diagram on page 2 of every PDF.
• Code compliance built in — IRC 2021, IBC 2021, NBC 2020, UK Part K, and Australia NCC. Pass/fail on riser, going, 2R+T, and headroom. Free handrail and guard reminders.
• Print-ready PDF — elevation diagram, cut list, lumber list, framing-square layout, and disclaimer. AirDrop, email, or print directly.
DESIGNED FOR THE SHOP
StairSmith is built around the moment you're at the workbench, sawdust on your glasses, trying to remember what number to mark. Open the "Show at Saw" sheet — the diagram fills your screen, with the two numbers you need in giant monospace type. Slide the framing square down the board, mark, repeat.
WHY ONE-TIME PURCHASE
Every other stair calculator on the App Store is either subscription-hostile or ad-ridden. StairSmith is a one-time purchase. Yours forever. No upsells, no nag screens, no "Pro" tier locked behind a paywall.
FOR DIY HOMEOWNERS
First time building a flight of stairs? Tap the (i) on Total Rise and you'll get a 3-sentence explanation of how to measure it correctly so your stairs don't end up an inch off. Tap any "Cut Number" on the Cut Sheet hero to learn what it means. The app teaches you while you use it.
FOR PROS
Switch between IRC, IBC, NBC, Part K, and NCC with a tap. Switch between imperial (with fractional input) and metric (mm) instantly. Save unlimited projects locally. The PDF cut sheet is dense, professional, and ready to hand a permit reviewer or a trade partner.
PRIVACY
StairSmith collects nothing. No account, no cloud, no analytics, no tracking, no ads. Your projects live only on your device.
NOT INCLUDED IN v1.0 (coming): multi-flight stairs, winders, landings, and isometric view. Today it's straight single-flight stairs only, done extremely well.
Built in California, by a builder who got tired of subscription tools that disrespect their users.
Questions: support@cascinobuilders.com
Ratings & Reviews
Polish and bug fixes.
The developer, Taylor Cascino, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Taylor Cascino
- Size
- 5.4 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Taylor Cascino
