Frequency Analyzer vs Speed Test Stealth

Turn your iPhone into a calibrated sound level meter, spectrum analyzer, and noise dosimeter. Built for fieldwork, inspections, and everyday measurements. Whether you are tuning a room, surveying noise on a job site, or checking workplace exposure, Frequency Analyzer gives you the data you need. REAL-TIME SOUND LEVEL METER - Live SPL readout with A, C, and Z weighting plus linear response - Fast (125 ms), Slow (1 s), and custom time averaging - Min, max, average, peak, and LAeq displayed continuously - Configurable reference calibration so your readings match a known source SPECTRUM AND SPECTROGRAM - Real-time FFT spectrum from 20 Hz to 20 kHz, linear or logarithmic axis - Scrolling spectrogram with selectable colormap and peak-hold markers - Octave-band view at 1/1, 1/3, 1/6, or 1/12 resolution - Classic oscilloscope waveform with adjustable time window - Amplitude-over-time history for slow trends across hours NOISE DOSIMETER Track noise exposure against NIOSH and OSHA criteria or a custom standard you define. The app accumulates dose throughout your shift, projects your 8-hour exposure, and reports the time-weighted average. Add event notes and export a PDF report with stats and graphs. REPORTS AND EXPORT - Reference tone generator from 20 Hz to 20 kHz for signal checks - CSV time-series exports for spreadsheets and analysis tools - Spectrogram PNG snapshots at configurable resolution - PDF reports with session statistics, charts, and event markers - Calibration and preferences stored locally on your device PRIVATE BY DESIGN Everything runs on your device. There is no account, no login, and microphone audio does not leave your phone. Sessions, notes, calibration data, and preferences stay in local storage. HOW TO USE 1. Grant microphone access and run the quick calibration walkthrough 2. Choose Analyzer, dB Meter, or Dosimeter from the tab bar 3. Use spectrum, spectrogram, waveform, octave, or amplitude history 4. Watch dose, peak, average, and frequency readings as you measure 5. Export CSV, PNG, or a PDF report when you need results Built for acousticians, safety officers, HVAC inspectors, musicians, and students who want serious acoustic measurement in their pocket. Free to download. Some features require a premium purchase. Privacy Policy: https://estifie.com/apps/frequencyanalyzer/privacy-policy Terms of Use: https://estifie.com/apps/frequencyanalyzer/terms-of-use

Speed Test Stealth gives you a precise, no-nonsense measurement of your internet connection — download speed, upload speed, latency, and jitter — all powered by Cloudflare's global network. WHAT IT MEASURES • Download & Upload — tested across 14 progressive stages (100 KB → 250 MB) for accuracy at any connection tier • Ping (latency) — unloaded round-trip time to Cloudflare's edge • Jitter — consistency of your connection over time HOW IT WORKS The app uses the same measurement methodology as the Cloudflare Speed Test web app, running sequential payload stages that adapt to your connection's real capacity. Results are reported as 90th-percentile values, filtering out one-off spikes for a stable, representative number. NETWORK AWARENESS • Detects WiFi, 5G, 4G, 3G, and Ethernet automatically • Identifies your carrier on cellular connections • Shows your local IP address and approximate ISP location using FreeIPAPI HISTORY Every test is saved locally on your device. Review past results by date, compare network types, and track how your connection changes over time. PRIVACY No account required. Speed-test payload traffic is sent to Cloudflare's public endpoints, and your public IP address is sent to FreeIPAPI to estimate ISP and approximate location. All history is stored on-device using Apple's SwiftData framework.