LevelFox: Level, Ruler & Angle

LevelFox is 4 essential measuring tools combined into one clean, responsive app: bubble level (spirit level), angle meter (inclinometer), on-screen ruler, and protractor. Calibrate all 6 sides with ease, measure accurately, and enjoy a tool with zero forced ads and zero invasive permissions.

WHY LEVELFOX
• True Accuracy: Smoothed gravity sensor readings displayed with 0.1° resolution.
• 6-Side Calibration: Calibrate all 6 faces of your phone (flat, face down, and every edge) using a simple 180° rotation technique — no certified flat surface required.
• Works Any Way Up: The bubble follows the phone in portrait and landscape, on any of its 6 sides.
• No Annoyances: No intrusive full-screen interstitials, no forced review popups, no mandatory subscriptions. Just one small banner at the bottom that hides during ruler and protractor measurements. Go Pro once to eliminate ads permanently.

4 TOOLS IN ONE APP
1. Surface Level (Bull's-Eye):
Circular bubble with concentric degree rings (1°, 2°, 5°) and dual X/Y angle readings for tabletop leveling, appliances, and flat surfaces.

2. Edge Level (Tubular Bubble):
Smooth tube bubble automatically matching the resting edge (bottom, top, left, right). Perfect for hanging picture frames, shelves, and cabinets.

3. Angle Meter (Inclinometer):
Large, bold digital readout with circular angle gauge. Supports degrees (°), slope percentage (%), mm/m, and in/ft (rise/run). Includes relative zero to measure angles between two surfaces.

4. On-Screen Ruler & Protractor:
• Caliper Ruler: Precision vertical ruler in centimeters and inches with dual draggable calipers. Calibrate with any standard credit card, ID card (85.60 mm), or coin for 100% physical accuracy.
• On-Screen Protractor: 0–180° protractor with two draggable rays and angle snapping (0°, 15°, 30°, 45°, 90°). Measure small physical objects placed directly on screen.
• Edge Angle: Press your phone edge against any surface, pipe, or lumber to read its exact tilt without opening the camera.

KEY FEATURES
• Haptic confirmation and optional audio tone when level is reached
• HOLD button to freeze readings in hard-to-see spaces
• Relative Zero mode ("REL") for angle differences
• True Black OLED dark theme (#000000) for battery saving and readability
• 100% Offline: Zero dangerous permissions required

PERFECT FOR
• DIY home improvement & carpentry
• Hanging picture frames, wall art, and shelves
• Aligning tables, washing machines, and RV campers
• Drawing, homework, and woodworking angle measurements
• Measuring small parts and hardware

NOTE
Readings rely on your phone's built-in motion sensors. Precision depends on hardware, phone case, and calibration. For safety-critical construction, always verify with a certified physical spirit level.

Part of the Fox app family by DangNH Studio.