iPhone and iPad apps

ZerothFloor apps for roof, stair, and deck work in the field.

The ZerothFloor mobile suite brings framing-specific calculators, 2D and 3D review, and export-ready outputs to jobsite workflows without forcing users into generic design tools.

Explore the apps View developer profile

3 launched appsFree to startLocal-first workflowsiOS 17.6+

Roof Rafter

Roof framing math, diagrams, and PDF packets from iPhone or iPad.

iOSFree to start on theRoof RafteriOS 17.6 or later · 7.3 MBOpen Read the full app page

Stairs 3D

Offline stair plans, 3D inspection, and shop-ready exports.

iOSFree to start on theStairs 3DiOS 17.6 or later · 5 MBOpen Read the full app page

Decks 3D

Framing-first deck plans, 3D review, and local build documents.

iOSFree to start on theDecks 3DiOS 17.6 or later · 5.4 MBOpen Read the full app page

Travel

Roof Rafter: Framing Calc

Roof framing math, diagrams, and PDF packets from iPhone or iPad.

Roof Rafter gives framers and contractors a roof-specific workspace for calculating rafter geometry, reviewing annotated 2D and 3D outputs, and turning field inputs into organized job packets without doing roof math by hand.

Free with in-app purchasesiOS 17.6 or later7.3 MB

Calculate common rafters with run, rise, overhang, birdsmouth, and cut detail.

Lay out hip roofs with hip lengths, jack schedules, ridge layout, and framing outputs.

Solve valley geometry with intersecting roof angles and cut-planning details.

Pricing

Free + Pro monthly or annual plans

Supports

Common, hip, valley, and gable workflows

Open app page iOSGet it on theRoof RafterFree with in-app purchasesOpen

Utilities

Stairs 3D: Framing Calculator

Offline stair plans, 3D inspection, and shop-ready exports.

Stairs 3D is a field-ready stair framing calculator that solves stair geometry instantly, lets users inspect the result in 3D, and packages the outcome into blueprints, cut lists, PDFs, and CSVs without requiring an account or network connection.

Free with in-app purchasesiOS 17.6 or later5 MB

Instantly solve rise per step, tread depth, stair angle, stringer length, and cut patterns.

Model straight stairs and stringer layouts in the free tier.

Upgrade to landing, L-shaped, U-shaped, and spiral stair builders in Pro.

Pricing

Free + Pro monthly or annual plans

Free tier

Straight stair + stringer workflows

Open app page iOSGet it on theStairs 3DFree with in-app purchasesOpen

Utilities

Decks 3D: Deck Builder

Framing-first deck plans, 3D review, and local build documents.

Decks 3D helps contractors, designers, and builders plan deck projects with deck-specific framing controls, live 2D and 3D review, material outputs, and on-device export workflows instead of relying on generic home design software.

Free with in-app purchasesiOS 17.6 or later5.4 MB

Design straight, L-shaped, U-shaped, freestanding, wraparound, custom, gazebo, multi-level, and octagonal decks.

Tune joist spacing, beam spacing, posts, footings, decking direction, stairs, railing, roof-over-deck concepts, and terrain notes.

Review live 2D deck plans with joists, beams, posts, footings, stairs, labels, and project metrics.

Pricing

Free + Pro monthly or annual plans

Shapes

Straight, wraparound, gazebo, multilevel, and more

Open app page iOSGet it on theDecks 3DFree with in-app purchasesOpen

Roof Rafter

Travel

Roof framing math, diagrams, and PDF packets from iPhone or iPad.

iOSInstall from theRoof Rafter$5.99/month or $49.99/yearOpen

Stairs 3D

Utilities

Offline stair plans, 3D inspection, and shop-ready exports.

iOSInstall from theStairs 3D$5.99/month or $49.99/yearOpen

Decks 3D

Utilities

Framing-first deck plans, 3D review, and local build documents.

iOSInstall from theDecks 3D$5.99/month or $49.99/yearOpen

Suite principle

Field-ready workflows

Each app is built around roof, stair, or deck planning instead of generic design software.

Suite principle

Local-first ownership

Projects, exports, and job references are designed to stay on device until users choose to share them.

Suite principle

2D and 3D review

Users can validate framing decisions visually before sending drawings or packets downstream.

Suite principle

Production outputs

The suite emphasizes printable documents, cut lists, material summaries, and handoff-ready exports.