ZeroLevel - Pro Spirit Level Live

**No ads. No waiting. No stress.** ZeroLevel is a spirit level app designed around one principle: stay out of your way. --- **[Simple. Ready the moment you open it]** Measurement starts the instant you launch — no splash screens, no ads, nothing in between. Hanging a shelf, leveling furniture, aligning a camera shot — built for that exact moment. **[Two measurement modes, automatic switching]** - 2D Mode (flat): Place your phone flat to see tilt in all directions at once. A bubble-style graphic makes it instantly readable. - Landscape support: Rotate to landscape for a larger bubble display with angle values at a glance. - 1D Mode (upright): Stand your phone upright to check walls and posts for true vertical. A bar-style graphic gives you a quick read. Auto-detects your phone's orientation and switches modes — manual override available anytime. **[Pro-grade calibration]** Thick cases, camera bumps — fully compensated. Back (flat) and side (upright) can each be zeroed independently. Every measurement starts from a true zero baseline. **[Hold mode for awkward spots]** One tap locks the reading so you can check it at eye level. A red border highlights the screen while locked — no guessing whether it's frozen or live. **[Dark UI, always-on display]** Bright daylight outdoors or dim workspaces — high-contrast fluorescent green on dark background keeps readings clear in any condition. Screen stays on during measurement so the numbers are always there when you need them. --- **[Pro: Feel the level — without looking at the screen]** Pro features are available as a one-time purchase to support development. **Stepped audio guidance (unique to this app)** Adagio → Andante → Moderato → Allegro → Vivace → Presto → Goal — 7 stages of rising tempo and pitch guide you to level without ever glancing at the screen. A vibration fires the moment you hit the goal zone — double confirmation. **3-level precision setting** - High Precision (goal under 1°): For precise, millimeter-level work - Medium Precision (goal under 2°): Perfect for everyday DIY - Low Precision (goal under 3°): Quick rough alignment Precision setting controls both the audio guidance cues and the "goal color" shown in the bubble and bar graphics. Additional Pro features: - Vibration feedback (can be toggled independently from sound) - Multiple calibration profiles (up to 3, each with a custom name) ※ When 2 or more profiles exist, the active profile name is shown on screen at all times - Raw sensor data display (accelerometer X / Y / Z axes) - Battery saving mode (reduces sampling rate to minimize power consumption) --- **[Our approach to ads and purchases]** This app is completely free with no ads. Pro features exist as a way to say "thanks for building this" — nothing more. No pressure. The free version is fully usable on its own. --- **Requires**: Android 5.0 (API 21) or later