FreqCheck : See Sound
ISO 17025 Certified Analyzer
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
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™ 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 three-layer forensic security protocol: device-hash anchoring, SHA-256 cryptographic sealing, 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.
Privacy Policy: freqcheck.com/privacy.html
Terms of Use: freqcheck.com/terms.html
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.
Ratings & Reviews
Version 2.0.0: The Class 1 Mobile Lab Upgrade
FreqCheck 2.0.0 transforms your device from a diagnostic scanner into a dedicated, enterprise-grade metrology instrument. This architectural upgrade introduces true hardware bridging and laboratory-grade controls, establishing FreqCheck as the first and only Class 1 Mobile Lab App.
PRO INPUT MODE (PIM)
Raw Data Capture
PIM bypasses standard mobile audio filters, automatic gain control, and heuristic smoothing entirely. Nothing touches your signal between the sensor and the engine. What reaches IND CORE™ is unadulterated, linear data — exactly what pure metrology demands.
Direct Hardware Bridging
Native support for professional external DAQ hardware and class-compliant USB interfaces via direct, DC-coupled line-in inputs. Zero attenuation means zero compromise. Your lab-grade sensors finally speak directly to your phone.
Manual Calibration Overrides
Enter your exact ADC voltage ceilings, sensor sensitivity coefficients, and hardware offsets by hand. This scales your mobile readings to match laboratory bench equipment precisely. Your field data and your bench data are now the same data — down to the sub-Hz decimal.
Dynamic Sample Rate Locking
Force the iOS audio session to handshake with external hardware at strict rates — 44.1 kHz, 48.0 kHz, 96.0 kHz , 192 kHz— while FFT bin resolution scales automatically to match your selected clock. Every calculation stays locked to true NIST-traceable precision. The math never drifts, no matter what hardware you connect.
UNBREAKABLE AUDIT TRAILS
Metrology Configuration Snapshot
Your exact hardware parameters are now captured on a read-only dashboard block and permanently stamped onto every PDF export. Nothing about your setup is hidden or reconstructed after the fact. Your audit trail defends itself.
Cryptographic Sealing
Every PDF Audit Report is sealed with a unique SHA-256 hash anchored to your specific device and session telemetry. Tamper with the data, and the seal breaks instantly. Your reports now carry undeniable evidentiary weight.
OFFLINE MEDIA ENGINE ALIGNMENT
Symmetrical Processing
The offline media engine has been rebuilt to mirror the live PIM pipeline exactly. Imported lossless audio and video files are now processed with full amplitude integrity and dynamic sample rate decoding. Whether you're capturing live or auditing a file, the math is identical — your forensic conclusions hold up either way.
The developer, Abundance Sea, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Abundance Sea, LLC
- Size
- 17.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - iPad
Requires iPadOS 18.6 or later. - Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.6 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Contains
Advertising
- In-App Purchases
Yes
- Pro Analyst $19.99
- Remove Ads $2.99
- Pro Analyst – Lifetime $149.99
- Copyright
- © 2025-2026 Abundance Sea, LLC. All Rights Reserved. FreqCheck™ protected by U.S. Patent 12,659,418 & Continuation App. 19/660,467. IND CORE™ ISO 17025:2017 Calibrated (Cert #05122C9A 2602).