V1.4 — real L/U segmented drawings, landing & width checks, cut lists, and Smart Suggest. TRUE L/U SHAPED STAIR DRAWINGS - Side view, PDF, DXF, and SVG now draw each flight of an L or U shaped stair separately with a landing break — no more one flight forced straight - Framing Square layout table now covers both flights of L/U stairs LANDING & WIDTH COMPLIANCE - Landing depth check for L/U stairs (IRC/IBC/NBC minimums) - Minimum stair width check now has real IRC, IBC, and NBC thresholds - Winder narrow-end tread check per IRC R311.7.5.2.1 (6-inch minimum) CUT LIST EXPORT - Per-board cut list with plumb/level cut angles, notch depth and position, and standard stock length — a new page in the PDF export SMART SUGGEST - One-tap local-math suggestions for riser/tread combinations that meet your chosen code, no network required MORE - Deck mode now supports L-shaped (wraparound) stairs - Saved projects stay browsable read-only without a subscription - 3D preview: 6 camera angles (front, left, right, back, iso, top) Still 100% offline. No tracking, no accounts, no servers. Camera used only when you tap Measure.

V1.3 — commercial codes, handrail checks, and framing-square layout. COMMERCIAL, INDUSTRIAL & ACCESSIBLE CODES - New code sets beyond residential: IBC (commercial), OSHA 1910.25 (industrial), and ADA - IBC 7-inch max riser and 11-inch tread; OSHA 9-1/2-inch riser with a 30-50 degree pitch window - ADA nosing projection and 1/2-inch leading-edge radius limits - Pick the code that fits the job right in Settings HANDRAIL & GUARD CHECKS - Handrail height 34-38 inches and guard height (36 inches residential, 42 inches commercial) - Graspability: Type I round (1-1/4 to 2 inch) and Type II perimeter (4 to 6-1/4 inch) FRAMING SQUARE LAYOUT - Framing-square body (rise) and tongue (run) settings for your exact stair - Per-step diagonal, total board layout, bottom-riser drop, and a full step-off table TREAD THICKNESS & NOSING - Set tread thickness (drives the bottom-riser drop) and nosing projection - Nosing checks per code, reflected live in the 3D preview IMAGE EXPORT - Export a high-resolution PNG of the full stair spec sheet to share or save to Photos Still 100% offline. No tracking, no accounts, no servers. Camera used only when you tap Measure.

V1.2 — spiral stairs, deck stairs, and pro structural checks. SPIRAL + HELICAL STAIRS - New spiral stair type with center-pole radius, outer radius, and turn angle - Walkline tread, clear width, headroom-per-turn, and outer helix (handrail) length - IRC R311.7.10.1 checks: 6-3/4-inch walkline tread, 9-1/2-inch riser, 6-foot-6 headroom - Top-down plan fan view plus a helical 3D model DECK STAIR MODE - Stringer count from stair width and on-center spacing - Wood (≤16 in) and composite (≤12 in) spacing advisories - Kicker board + landing pad added to the Bill of Materials RAILING + BALUSTER SPACING - Equal-spacing baluster calculator per IRC R312.1.3 - 4-inch sphere on level guards, 4-3/8-inch on the stair rake STRUCTURAL THROAT + SPAN - Throat depth from 2x10 / 2x12 / 2x14 board width with a minimum-throat warning - 6-foot cut-stringer span check (AWC/APA practice) - Open (cut) vs closed (housed) stringer, each drawn its own way CONSTRAINT SOLVER - Solve for fixed rise, fixed run, or both — the app derives the rest MULTI-VIEW 3D - Switch the 3D preview between 3D, Front, Side, and Top (orthographic) views Still 100% offline. No tracking, no accounts, no servers. Camera used only when you tap Measure.

Big V1.1 update — built around how real carpenters work. NEW STAIR TYPES - L-shaped, U-shaped, and winder stairs alongside straight - Per-flight stringer + run breakdown - IRC R311.7.5.2.1 walkline tread check at 12-inch radius GLOBAL CODE COMPLIANCE - Switch between US IRC, Canada NBC (OBC mirror), UK Approved Doc K, and Australia NCC 2022 - Region-specific thresholds for max riser, tread, headroom, pitch, and landing HEADROOM + FLOOR FINISH COMPENSATION - Optional ceiling height input flags low headroom - Top / bottom finish thickness inputs ensure equal risers AFTER flooring AR MEASURE (LiDAR aware) - Two-tap distance measurement straight into Total Rise - LiDAR-equipped iPhones get +/-1 cm accuracy 3D PREVIEW - SceneKit isometric view alongside the 2D side elevation - Drag to orbit, pinch to zoom EXPORTS + MATERIALS - Per-project Bill of Materials added as PDF page 2 (lumber feet, treads, risers, total cost) - DXF (CAD) and SVG (vector) export alongside PDF - 1:N integer scale picker auto-snaps to architect / carpenter scales PROJECT DETAILS - Site notes + reference photos via PHPicker (no permission needed) - Stair-type-aware summary card POLISH - Custom fraction precision (1/2 to 1/64) - Multi-flight landing suggestions when over the regional flight cap - Animated How-to-Cut walkthrough in Reference Still 100% offline. No tracking, no accounts, no servers. Camera used only when you tap Measure.

Welcome to StairPlan! - Real-time stringer calculations with imperial fractions or metric - IRC R311.7 compliance warnings as you type - Save unlimited projects with custom names - Export scale PDF cut diagrams - Side view visualization - Reference section with code, formulas, and cutting tips - 100% offline, no data collection, no ads Start with a 3-day free trial.