dB Logger vs Live Spectrum Analyzer

Free to download. One-time unlock. No subscription, ever. dB Logger turns your phone into a professional-grade sound level meter, frequency analyzer and noise logger — with no account, no cloud, and no subscription, ever. Most sound apps measure your phone's audio AFTER the operating system has "cleaned it up" with echo cancellation, noise suppression and automatic gain. dB Logger doesn't. It captures RAW, UNPROCESSED audio — from the built-in mic or an external USB-C measurement microphone — so what you see reflects the real acoustic field. WHAT PEOPLE USE IT FOR • Measure a noisy neighbor, upstairs bass, or HOA / tenant nuisance — log it over time and export a timestamped CSV + PDF report to attach to a complaint. • Check whether a concert, gig, gym class, bar or restaurant is loud enough to risk your hearing — and how long is safe. • Find out if your baby's white-noise machine is too loud at the crib, and how far to move it. • Assess a room like a consultant: NR and NC single-figure ratings from octave bands for HVAC and building-services work. • Track workplace noise exposure against OSHA, NIOSH or EU limits with the built-in dosimeter. • Check a sound system, studio, AV install or science project with a live spectrum and weighted levels. MEASURE • Real-time dB-A, dB-C, dB-Z with selectable update rate (200 ms to 10 s) • Fast / Slow / Impulse time weighting; current, AVG (Leq), MAX and PEAK • NR (Noise Rating) and NC (Noise Criteria) single-figure room ratings • A noise-source guesser that tells you WHAT is loud, not just how loud VISUALIZE • Live FFT spectrum, 20 Hz – 20 kHz, with peak-hold and peak detection • 1/1 & 1/3-octave equalizer with per-band peak caps • Scrolling time-history graph, color-coded by level • A clean analog dB gauge with AVG / MAX / PEAK LOG, REPORT & SHARE • Log metrics to CSV and raw audio to lossless WAV, independently • Browse saved sessions and generate PDF / CSV reports • Noise Camera: snap a photo or record a video with the live dB reading burned in — clear evidence, easy to share BUILT RIGHT • Guided + manual calibration, saved per microphone profile • USB-C external measurement-mic support, with a visible input picker so you always know which mic you are measuring with • 42 languages; light / dark and Glass / Classic themes • On-device and private — no account, no cloud; your audio and readings never leave your phone unless you choose to share them FREE vs FULL VERSION dB Logger is free to download and fully usable for live measurement — the meter, gauge, spectrum, spectrogram, analyzer and dosimeter are all free and unlimited. The free version also lets you record, export and film video for up to 30 seconds so you can try the whole workflow; those trial clips, exports and reports carry a small "Trial" mark, and the free version keeps two days of dosimeter history. Unlock the full version with a single one-time purchase — no subscription, ever — for unlimited recording, unlimited CSV/WAV/PDF export, full-length video with no watermark, the complete dose history, and no ads. Already bought "Remove Ads"? You're upgraded to the full version automatically, at no charge. Accuracy note: a smartphone microphone is not a certified Class 1/2 (IEC 61672) sound level meter. dB Logger targets reproducible, calibrated relative measurement with standards-correct weighting and rating math. For regulatory or compliance decisions, verify with certified instrumentation.

Live Spectrum Analyzer is a real-time audio visualization tool for musicians, students, teachers, sound makers, and anyone who wants to see sound clearly. Use the microphone for live input, or import an audio file from Files to inspect how frequency, amplitude, pitch, and dynamics change over time. Switch between waveform, FFT, sonogram, spectrum bars, VU meter, pitch, octave bands, peak hold, envelope, waterfall, phase, Lissajous, and XY Scope views. Each mode is designed for quick visual reading while you listen, tune, practice, demonstrate acoustics, compare sounds, or check a recording. The app also provides practical analysis readouts, including RMS, peak level, decibels, detected pitch, strongest frequency peaks, spectral centroid, zero crossing rate, dynamic range, estimated BPM, beat strength, mel bands, chroma, noise floor, and clipping status. Results are intended as helpful visual references rather than certified measurement data. Key features: • Live microphone waveform and spectrum visualization • Import audio files for playback and local visual analysis • Waveform, FFT, sonogram, bars, VU, pitch, waterfall, phase, and scope modes • Adjustable gain, time window, FFT floor, sonogram brightness, contrast, and speed • Pitch reference, tolerance, microphone gain, and noise gate settings • Record audio locally, review saved recordings, and share or delete files • Capture visualization snapshots as PNG images • Local-first workflow with no account required Subscription and purchase information: The app offers a free experience and optional Pro access. Actual prices, trials, promotions, and availability are shown in the App Store. Privacy and data information: Your microphone input, imported audio, recordings, snapshots, and analysis results stay on your device by default. The app does not require an account and does not upload your media to a server operated by us. Privacy Policy: https://sites.google.com/view/livespectrumanalyzer/home/privacypolicy Terms of Use: https://sites.google.com/view/livespectrumanalyzer/home/term_of_use Contact: gongchengyong70@gmail.com