FreqCheck : See Sound

Identify the source or audit acoustic content. FreqCheck is the first and only Class 1 Mobile Lab App — ISO/IEC 17025-calibrated, NIST-traceable results.

Identify the source, audit acoustic content, or import lab audio files. FreqCheck is the first and only Class 1 Mobile Lab App — an ISO/IEC 17025-calibrated, NIST-traceable spectral engine powered by IND CORE™ (U.S. Patent No. 12,659,418) that adapts to your exact level of expertise.

You've heard it. That low, persistent hum no one else seems to notice. That frequency track promising precise therapeutic tones that may or may not actually be there. That vibration in your chest you cannot explain.

It doesn't matter what you were told — FreqCheck lets you measure it.

TWO POWERFUL INSTRUMENTS. ONE SEAMLESS APP. FreqCheck houses two modes in a single app: a streamlined everyday scanner and a raw, unfiltered Pro Input Mode (PIM), backed by the same certified engine that makes this the first and only Class 1 Mobile Lab App on the market. The engine natively bridges to professional external DAQ hardware and class-compliant USB interfaces via direct, DC-coupled line-in inputs, accepting calibrated telemetry with zero attenuation and no translation layer. That means no extra software suites in the field, and no wondering if your tool is capable enough. One app scales instantly from your iPhone's microphone for a quick check to raw lab-grade capture from dedicated gear. Whatever the moment demands, you already have it in your hand.

PRO INPUT MODE (PIM): ENTERPRISE METROLOGY PIM grants direct manual control over critical hardware variables — sample rate locks, ADC voltage ceilings, sensor sensitivity coefficients — bypassing standard mobile audio filters and auto-gain compression entirely. That means your field readings hold up next to expensive lab bench equipment, down to the sub-Hz decimal. The numbers you capture are the same numbers a lab would produce — no asterisks, no caveats.

OFFLINE MEDIA AUDITING The engine natively ingests raw video and lossless audio formats (.wav, .flac, .alac, .aiff, .m4a, .mp3), applying the same calibrated metrology math to pre-recorded files as it does live feeds. That means you can audit digital claims, verify therapeutic frequency tracks, and conduct forensic analysis — completely offline. The truth hidden inside a file is one import away.

FORENSIC-GRADE PROOF. IN YOUR POCKET. Every measurement is locked by a four-layer forensic security protocol: device-hash anchoring, real-time SHA-256 frame sealing, master session hashing, and digitally signed PDF exports. Any attempt to alter telemetry after the fact instantly breaks the seal and invalidates the document. What you present carries the same evidentiary weight as a controlled laboratory result. Certification #05122C9A 2602.

ZERO-KNOWLEDGE PRIVACY FreqCheck runs on a strict zero-knowledge edge-computing framework — 100% of IND CORE™ processing happens locally on your device. No raw audio or video is ever uploaded or stored, and ad-tracking SDKs have been permanently removed. Every reading stays exactly where it belongs — with you.

Starter: Free basic scans, ad-supported.

Remove Ads: $2.99 one-time.

Pro Analyst Monthly: $19.99/month, 7-day free trial.

Pro Analyst Lifetime: $149.99 one-time.

Pro unlocks the LOGS vault, full ISO-compliant PDF Audit Reports, and the Nyquist Forum — a growing repository where field teams and investigators share certified, sealed telemetry data.

THE MICROSCOPE MOMENT The microscope didn't create bacteria. It revealed what was always there. GPS didn't create your location. It made it knowable.

FreqCheck makes the infrasonic spectrum visible, measurable, and provable — the first and only Class 1 Mobile Lab App, right in your hand.

You don't need a degree. You need one tap.

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DISCLAIMER: FreqCheck is an engineered metrology tool for research, acoustic consulting, and educational purposes only. Not intended for medical diagnosis. Full end-to-end NIST traceability requires an unbroken chain of calibrated external hardware.