Drag the floor height, watch the treads redistribute, and see a walking figure test your headroom under the joists. StairFit does the stair math on the job site, with zero bars of signal.
Try the live calculator ↓Real maths, running right here in your browser. Slide the numbers and the section drawing updates.
Pull total rise, floor openings and tread counts around a 2D canvas and see the layout reshape instantly.
Keeps 2R + T inside the 60–64 cm comfort band so the stair feels natural underfoot.
A walking human silhouette tests clearance beneath upper-floor joists before you cut a single board.
Touch to adjust the finished floor height and every riser is recalculated to the same dimension.
Stringer length, notch dimensions and pitch angles in the 30°–37° sweet spot, ready to mark.
Save stairs for multi-story homes, deck steps and basement runs, and reopen them on any job.
🪚 We are a small crew of stair builders, software tinkerers and weekend renovators who got tired of scribbling riser maths on offcuts of plywood.
🎯 Our mission is simple: make every staircase safe, comfortable and code-ready, no matter who is holding the tape measure.
📐 StairFit gives you instant riser and tread layouts, honest headroom checks, stringer lengths and a saved journal of your stairs, all working fully offline in a basement or on a roof deck.
Measure once. Fit right. Climb easy.
Effective Date: September 2026
StairFit: Rise & Tread does not collect, store or share any data. Everything you do in the app stays on your device.
None. We do not collect personal details, location, measurements, photos, device identifiers or usage statistics.
Since we hold no information, we do not use it. Your dimensions are used only on your device to calculate your stair layouts.
Saved layouts in your journal live only in local storage on your device. There is no cloud, no server and no sync.
The app has no analytics, advertising networks, trackers or third-party SDKs, and it works fully without an internet connection.
Because nothing leaves your device, your data is protected by your device's own security. We recommend using a screen lock.
We do not knowingly collect information from anyone, including children under 13, in line with COPPA. The app is safe for family use.
You are in full control. There are no accounts to manage. Delete saved layouts in the app, or remove everything by uninstalling it.
If this policy changes, the updated version and a new effective date will appear here and in the app's next update.
Questions? Write to privacy@stairfitrisetreadapp.com.
💬 Got a stubborn staircase, a feature idea or just a kind word? Write to us, we love hearing from people who build things.
Generalhello@stairfitrisetreadapp.com Technical supporthelpdesk@stairfitrisetreadapp.com Business & partnershipspartners@stairfitrisetreadapp.com⏱️ We reply within 24–48 hours, usually faster than concrete cures.