Sound HUD - Decibel Meter

Sound HUD is a professional real-time acoustic sound level meter (dB SPL) and telemetry dashboard designed with a tactical aviation cockpit head-up display. KEY FEATURES: • Real-time high-precision sound level measurement (dB SPL) with zero lag. • Frequency Weighting Curves: A-Weighting (human ear), C-Weighting (industrial/peak), and Z-Weighting (unweighted flat linear). • Comprehensive metrics: Continuous equivalent level (LAeq), peak level (Peak Hold), minimum, and maximum sound pressure levels. • Noise Dose Safety Monitor based on NIOSH standards (85 dBA / 8-hour exposure limit). • Dynamic historical charts with SwiftUI Charts and selectable time horizons (1m, 5m, 30m). • Real-time 16-band Fast Fourier Transform (FFT) frequency spectrum visualizer. • Precise microphone calibration offset (±10 dB) in 0.5 dB increments. • Acoustic telemetry session report generator with one-tap Markdown and plain text export. • 4 Tactical Cockpit Themes: Tactical Amber, Neon Cyan, Matrix Green, and Arctic White. • Light / Dark appearance modes and high-legibility avionics typography (Garmin & Tesla cockpit fonts). • Complete privacy: 100% on-device volatile audio processing. No audio is ever recorded, stored, or transmitted to any server. SOUND HUD PRO: Unlock unlimited real-time FFT spectrum analysis, unlimited telemetry report exports, and remove all advertisements permanently with a single lifetime purchase.