Bubble Level Spirit Level Tool

SAPPS Interactive

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Turn your phone into a bubble level — a precise, dual-axis spirit level tool you can carry in your pocket. No batteries, no extra gear. Just open the app, place your phone on any surface, and watch the bubble settle.

Bubble Level is built around one job: telling you when something is level, on both axes, accurately. If you've ever searched for a bubble level online or needed a spirit level when yours was in the garage, this is the app for you.

🟢 WHAT IT DOES

- Dual-axis bubble level — see horizontal (X) and vertical (Y) alignment at the same time on a single screen
- Vibration alert the moment a surface is perfectly level, so you don't have to stare at the screen while you adjust a shelf or frame
- One-tap calibration — set a true zero on any flat reference surface, so your phone's sensors read accurately on your specific device
- High-contrast display — bright green bubble on a dark background, easy to read in sunlight or a dim garage
- Works fully offline — no internet, no account, no sign-up
- Lightweight install, opens instantly

🛠️ WHEN TO USE IT

- Hanging picture frames, mirrors, and shelves straight
- Mounting a TV bracket or floating shelf
- Checking that a washing machine, fridge, or appliance sits flat
- Quick checks around the house when your real spirit level isn't within reach
- Camping or RV trips where you need to level the floor of a caravan
- Aligning a tripod or camera before a shot
- DIY projects where eyeballing it isn't good enough

🎯 DUAL-AXIS, NOT JUST ONE

A lot of phone level apps only show tilt on one axis at a time, forcing you to rotate the phone to check the other direction. Bubble Level shows both X and Y simultaneously, so when you're leveling a shelf or a tabletop you can see in one glance whether it's flat in every direction — not just side-to-side.

⚙️ CALIBRATION

Every phone is slightly different. The accelerometer in your device may have a tiny factory offset that throws off precision by a fraction of a degree. The built-in calibration tool fixes that in two seconds:

1. Place your phone on a surface you know is level (or as close as you can get)
2. Tap calibrate
3. Done — your phone now reads true zero on that reference

Re-calibrate any time you want, or reset to defaults.

🔋 WHY A PHONE BUBBLE LEVEL

Modern phones ship with high-precision motion sensors — the same ones that rotate your screen and stabilize your camera. This app reads those sensors directly and translates them into a true bubble level. For everyday home and DIY jobs, it's more than accurate enough, and it's always in your pocket.

The vibration alert is the feature people love most. Instead of crouching, squinting at the bubble, and trying to tighten a screw at the same time, you keep your eyes on what you're doing. The phone buzzes when you hit level. Hands free.

✨ DESIGN PRINCIPLES

We built this app deliberately small. A spirit level is a tool — it should load fast, do one thing well, and get out of your way. You'll find:

- A single clean screen, no tabs or menus to navigate
- Subtle, unobtrusive UI that respects your time
- No subscriptions, no paywalls in front of the core feature

🏠 PERFECT FOR

Homeowners hanging art. Renters setting up a new apartment. DIY enthusiasts tackling weekend projects. Photographers aligning tripods. Travelers leveling a caravan or pop-up camper. Anyone who's ever needed a spirit level and didn't have one within arm's reach.

📱 REQUIREMENTS

Works on any Android phone with a standard accelerometer — pretty much every phone made in the last decade. For best accuracy, lay your phone flat on the surface you're measuring rather than holding it in the air, and calibrate once on a known-flat reference.

Download Bubble Level today — the spirit level tool you'll actually have on you when you need it.

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