# Spirit Level Pro

> Turn your phone into a precision spirit level. Free, works offline, no account needed.

## What it does

Spirit Level Pro is a progressive web app (PWA) that uses your phone's motion sensors to work as a digital spirit level / bubble level. It provides real-time tilt measurement with a visual bubble vial and proximity audio feedback that guides you to level hands-free.

## URL

https://spiritlevel.pro

## Key features

- **Bubble vial UI** with real-time pitch and roll readouts
- **Proximity audio** — beeping gets faster as you approach level, plays a continuous tone when level
- **Surface and plumb modes** — circular vial for flat surfaces, tall vial for vertical plumb checks
- **Five tolerance presets** — General (±0.5°), Framing (±1.0°), Finish (±0.3°), Tile (±0.2°), Precision (±0.1°)
- **Works offline** — installs as a PWA, fully functional without internet
- **20 languages** — English, Chinese, Hindi, Spanish, Arabic, French, Portuguese, Russian, Japanese, German, Korean, Italian, Turkish, Vietnamese, Thai, Polish, Dutch, Indonesian, Ukrainian, Malay

## Pro features ($10 one-time)

- Save and organize measurements by project
- Photo proof attached to each reading
- Before/after comparison tracking
- PDF reports — one tap, ready to send
- Share measurements with your team
- GPS tagging — auto-stamp job locations
- CSV export for spreadsheets and records
- Hold reading — tap to freeze the display
- Slope units — %, mm/m, in/ft, ratio, roof pitch
- Target angle — set any angle as your level target
- Quick save — double-tap to save instantly

## Who it's for

Contractors, builders, carpenters, DIYers, tilers, plumbers, electricians, and anyone who needs to check if something is level or plumb. Useful for hanging shelves, setting drainage slopes, framing walls, installing tile, and general construction work.

## Technical details

- Zero-dependency PWA — no app store needed, works in any modern browser
- Uses the DeviceOrientation API for sensor data
- All data stays on-device (IndexedDB) — no account, no cloud sync
- Available at spiritlevel.pro in 20 languages with automatic language detection