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First release. Bubble Level, Lux Meter, Decibel Meter, and Compass — all in one app.
Smart sensors in your pocket. Bubble level, lux meter, dB meter & compass.
Senso turns your phone into a pocket workshop of precision instruments. Five sensor tools, zero clutter, no in-app purchases, no PRO tier — every feature is free, forever. ▪ BUBBLE LEVEL & PROTRACTOR A 1D bubble bar plus a 2D bullseye target for laying shelves, hanging frames, levelling a tripod, or checking a worktable. Snap-to-zero filtering kills jitter, haptic feedback pulses the moment you cross into the green band. Includes a digital protractor with degrees, percent, n/12 roof pitch, and radians, plus a slope calculator with accessibility hints (wheelchair ramps, residential roofs, drainage gradients). ▪ LUX METER (LIGHT METER) Read ambient illumination in lux with a background that gradients from black at night to bright white at noon. Plant mode covers Monstera, Ficus, Peace Lily, Phalaenopsis, ZZ, Cactus and Pothos with min / ideal / max ranges. Workspace mode flags whether your office, reading nook, kitchen, sewing area, kids' study or workshop meets ISO / DSTU minimums. Reference sheet walks you from moonlight to direct sunlight. ▪ DECIBEL METER (SOUND METER, dB / SPL METER) A vertical VU meter with a peak indicator, central dB readout, and a 60-second sparkline. A-weighted (dBA) measurement with the IEC 61672 IIR cascade for a true SPL feel. NIOSH 3 dB exchange-rate hearing-safety calculator shows remaining safe exposure at the current level — useful at concerts, construction sites, factories, restaurants, or noisy commutes. ▪ COMPASS WITH TRUE NORTH Animated compass rose with cardinal labels and 5° tick rings. Switch between magnetic and true north — declination computed locally with the full WMM-2025 spherical-harmonic model (no internet required). Set-bearing chip lets you lock a target direction. Magnetic-interference warning kicks in near speakers, motors, or large metal objects. ▪ HISTORY Save any reading from any tool with a single tap. SQLite-backed log with per-feature filters (Level / Light / Sound / Compass) and bulk-clear. ▪ WHY SENSO - 100% free, no PRO tier, no in-app purchases, no paywalls, no trials. - Works fully offline. All sensor processing is on-device. - Privacy-first: Senso collects nothing. No accounts, no tracking, no analytics. Ads are served by Google AdMob (industry standard). - Material 3 design with light + dark themes that follow your system. - Eight languages: English, Ukrainian, Polish, German, Spanish, Portuguese, French, Italian. - Calibration shortcuts for level, microphone, and compass. - Optional camera mode for the bubble level — overlay a virtual horizon on your camera preview. Senso runs on devices with the standard Android sensor suite (accelerometer, microphone, magnetometer where available, ambient light sensor where available). The true-north compass uses your location, but only while you have the Compass screen open — never in the background, never stored, never sent off-device. Smart sensors in your pocket — that's it.