Plumbline Studio

A precision level, plumb, slope, protractor, concrete calculator, angle arithmetic, lumber calculator, triangle solver, and project-journal toolkit for real workshop measurements — fully offline, no account required.

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What It Does

Live Bubble Level

0.1° resolution bullseye + dual-axis vials. Tap to zero against any reference surface. Yaw, pitch, and roll readouts.

Protractor / Inclinometer

±180° range. Hold-to-lock freezes the reading. Copy angle to clipboard or save to journal.

Slope Calculator

Rise/run ↔ degrees ↔ percent ↔ ratio ↔ mm/m. ADA ramp, OSHA stair, IRC plumbing reference cards built in.

Stair Calculator

IRC R311.7 compliant. Risers, treads, stringer length, headroom check, 2R+T comfort check, and a side-view diagram.

Rafter Calculator

Common, hip, and jack rafter lengths with plumb cut, seat cut, and bird's-mouth seat. Pitch picker from 4/12 to 16/12.

Compound Miter

Crown moulding miter & bevel for any wall corner and spring angle (38°, 45°, 52°, or custom). Both flat-on-table and nested methods shown.

Cut-List Optimizer

First-Fit-Decreasing 1D bin packing. Enter stock lengths and required parts; get the optimal cut layout with a colour-coded diagram.

Drainage Slope

Run-to-drop in four formats (in/ft, %, 1:N, mm/m). IRC DWV, ADA cross-slope, concrete slab, and roof drain standards.

Triangle Solver

Five modes — Right, SSS, SAS, ASA, AAS. Enter any combination of known sides and angles; all remaining values and area calculated instantly with a live diagram.

Board-Foot Calculator

Multi-board lumber estimator. 28-species price reference (pine through ebony, with Janka hardness ratings), adjustable waste factor, and per-board cost breakdown.

Concrete Calculator NEW

Five pour shapes — rectangular slabs/pads, wall footings, round columns, tube forms (Sonotube), and stair step-blocks. Shows exact cubic yards, cubic feet, cubic meters, bag count (60 lb or 80 lb at Quikrete yields), and ready-mix cost range. IRC R403.1 footing reference included.

Angle Math NEW

Derive eight related angles from any known measurement: complement (90°−A), supplement (180°−A), bisect (A÷2), double (2A), A+B, A−B, reflex complement (360°−A), and radians. Capture angle from the live inclinometer with one tap. Preset buttons for 22.5°, 30°, 38°, 45°, 52°, 60°, and 90°. Tap any result to copy.

AR Plumb-Bob

Drop a virtual plumb line to check walls and frames for true vertical. Drift readout in real time.

Flatness Scan REAL SENSOR

Slide the phone across a surface in an S-pattern; the accelerometer maps actual deviations to a 9×6 heatmap. Green = flat, red = dip, brass = hump. Live peak, valley, and RMS readouts in millimeters. Now reads real data — not a demo animation.

Project Journal

Save measurements from any tool to named projects. Client name, location, notes. Export as a PDF report or CSV spreadsheet.

Who It Helps

Carpenters, framing crews, concrete crews, finish trimmers, tile setters, inspectors, and careful homeowners who need accurate measurements and a way to document them — without cloud sync, accounts, or recurring fees.

Fully Offline

No internet connection required — ever
No account or sign-in
No ads or tracking
No in-app purchases
All data stays on your device

Actual App Interface

This image shows the current iPhone app interface prepared for review-facing screenshots.

Last updated June 15, 2026