Bubble Level Pro

We’ve all been there — you install a shelf, take a step back, and it’s just slightly off. Not now. The Bubble Level App was designed for all those who take their work seriously. Whether you are a weekend DIYer, a professional contractor or just someone that wants to get it done right the first time.
Key Features:
🫧 Bubble Level for Classic, Reliable Alignment
🧪 Tube Level for Curved & Cylindrical Surface Checks
📐 Digital Level for Pinpoint Numerical Accuracy
📏 Protractor for Measuring Perfect Angles Every Time
⛰️ Slope Meter for Gradient & Incline Analysis
🪃 Plumb Bob for True Vertical Reference Lines
🔔 Haptics & Sound — Feel and Hear the Moment Level is Achieved
🌗 Light & Dark Mode for Comfortable Use Day or Night
📡 Open Source & Works Without Wi-Fi — No Connection Needed, Ever

The Bubble Level gives you that classic, familiar leveling experience you already trust — right on your phone. Working with pipes or rounded surfaces?
The Tube Level has you covered where a flat level simply won't do. And when you need a real number to work with, the Digital Level gives you an exact reading so there's no second-guessing.
Nobody wants to cut a piece of wood twice. The Protractor helps you nail exact angles the first time, so your materials fit together cleanly and your work looks the way it should. On a ramp, a roofline, or any uneven surface? The Slope Meter tells you exactly what you're working with so you can plan accordingly.
There's something satisfying about a perfectly straight wall or a door frame that sits just right. The Plumb Bob gives you a true vertical reference so everything lines up from top to bottom, every time — no leaning, no tilting, no fixing it later.
One of our favorite little touches — when your surface hits a perfect level, your phone gently vibrates and plays a sound. With Haptics and Sound enabled, you don't even have to stare at the screen. Just hold, feel the buzz, and move on with your work.
Dark basement or bright backyard — Light and Dark Mode keeps the display easy on your eyes no matter where the job takes you. And because the Bubble Level App is fully open source and works completely without Wi-Fi, you never have to worry about signal, subscriptions, or surprises. Just open it and get to work.