Frequency Analyzer vs Frequency Generator & Analyzer

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

Turn your iPhone into a professional-grade acoustic laboratory. Powered by the high-fidelity YIN pitch detection algorithm, Frequency Counter delivers instant, real-time audio frequency analysis and tone synthesis with uncompromising engineering precision. Whether you are testing audio equipment, analyzing ambient sound waves, tuning musical instruments, or calculating motor RPM, this app provides the advanced tools you need in a clean, high-contrast visual dashboard. KEY FEATURES 1. REAL-TIME AUDIO ANALYSIS & SPECTROGRAPH High-Fidelity Pitch Detection: Track real-time sound frequencies instantly with exact readouts in Hertz (Hz). Live Oscilloscope Grid: Visualize active sound waves on a sweeping, highly responsive neon coordinate grid. Signal Gain Adjuster: Amplify low-amplitude ambient sounds easily by adjusting the visual height of the oscilloscope lines. Music Note Translator: Automatically convert active frequency measurements to the closest corresponding musical note (based on standard A4 = 440 Hz tuning). 2. ADVANCED STATS & ANALYTICS (PRO) Live Session Tracker: Monitor Minimum, Maximum, and Average frequencies detected during your active scanning session. Integrated Decibel Meter: View current volume levels (dB) directly alongside your frequency readout. RPM Speed Calculator: Measure the speeds of rotating fans, propellers, or motors with a configurable blade multiplier (1 to 8 blades). 3. PRECISION SCAN CONTROLS Freeze Screen: Freeze the active frequency readout and grid at any moment to inspect specific sound intervals. Reset Peak Meter: Instantly clear out the highest recorded peak frequency with a single tap. Start/Stop Engine: Complete control over your microphone input scanning sessions. 4. PROCEDURAL SOUND WAVE GENERATOR (PRO) Real-Time Sound Synthesis: Generate continuous tones supporting four reference waveforms: Sine (Cyan), Square (Green), Sawtooth (Orange), and Triangle (Purple). Tactile Tuning Pad: Fine-tune your output with incremental coarse buttons (-100, -10, -1, +1, +10, +100 Hz). Interactive Sweepers: Seamlessly navigate the human hearing spectrum (20 Hz - 20 kHz) using linear volume and logarithmic sweep sliders. Direct Hz Keyboard: Double-tap the main Hertz indicator to type your exact desired frequency via a dedicated number pad. GO PRO WITH FREQUENCY COUNTER PREMIUM Unlock the full analytical power of your device. Premium subscriptions remove all session limits and unlock: Unlimited scanning sessions and freeze-frame analysis. Full access to the Procedural Sound Wave Generator. Complete Stats Dashboard (Min/Max/Avg Tracker, dB Meter, and RPM Calculator). Choose from our flexible Premium plans: Weekly, Monthly, or Yearly subscriptions. Note: Microphone access is strictly required for real-time frequency analysis. All audio processing is performed locally on your device; your data remains completely private. Choose Your Plan Unlock the full analytical power of Frequency Counter. Get unlimited scanning sessions, full access to the advanced sound wave generator, and real-time tracking tools. Weekly Access — $1.99 / week (Most Popular) Monthly Pass — $4.99 / month Annual Saver — $29.99 / year (Best Value) Cancel anytime in your App Store account settings. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Terms of Service : https://sites.google.com/view/freqmeterterms/home Privacy Policy : https://sites.google.com/view/freqcounterpolicy/home