MeterWorks Spectrum Analyzer
See & log hidden tones
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
See hidden tones: live spectrum, zoom, watch bands with automatic events, walk map, evidence PDF. Honest up to 24 kHz. One-time purchase — no ads, no subscription.
A tone you can't place — the motion-sensor deterrent next door, a beep from inside a wall, a hum from the basement. You can barely hear it, but it's there. MeterWorks Spectrum Analyzer makes it visible: live spectrum, automatic logging, an evidence PDF — on your device, no account, no subscription.
MEASURE & CIRCLE IN
• Live spectrum, linear or logarithmic axis, stepless pinch-zoom in frequency AND level
• Peak detection with the resolution stated openly, 60-second waterfall
• Device self-test "What can YOUR iPhone do?" shows the real usable top frequency before you buy
• Walk mode: keep measuring while you walk the property, every point on the map carries its level — you circle in on a source, you don't locate it
WATCH BANDS & LOG — THE EVIDENCE CHAIN
• Pro: name your own watch bands ("cat-deterrent window" 16–24 kHz, "hum" 20–200 Hz, fully custom), each with its own threshold
• Pro: automatic events — when a band crosses its threshold, the entry writes itself: start, duration, classification
• Pro: walk report as PDF with a map snippet, a point table, and band spectra — plus CSV
• Quiet references: save silence at a location, later measurements show the rise over it (1 free, more with Pro)
DOCUMENT
• PNG export with footer — free
• Pro: multi-page PDF report with statistics, spectrogram, and event table
• Pro: CSV export of the band levels — spreadsheet-ready
FREE VS. PRO — NO SURPRISES
Free: live spectrum with full zoom (3 sessions of up to 30 seconds each), waterfall, self-test, limits page, A/B comparison, 1 reference, three recordings of 10 seconds each, one walk of up to 30 seconds, PNG export. Pro is a single one-time purchase (no subscription, ever): watch bands, unlimited walks with report PDF and CSV, more references, unlimited live view and recordings, log PDF, CSV — all future Pro features included.
WHAT THIS APP CANNOT DO — HONESTLY
What kids can hear, this app can see: the audible range up to 24 kHz sits fully inside the iPhone microphone's window. True ultrasound above that is beyond any iPhone — and beyond any app that claims otherwise (the Nyquist limit of 48 kHz sampling). What holds up is the comparison within the same band over time, not an absolute dB value. This app documents, it doesn't judge: no "court-proof" claims — a clean log with openly stated limits.
TYPICAL USES
Circle in on a noise source in the garden or neighborhood · identify a sound you can barely hear yourself · confirm a motion-sensor or cat-deterrent frequency · document a hum inside the house
NO SUBSCRIPTION. NO ADS. NO TRACKERS.
All measurement data stays on your device — only band-aggregated spectra, never audio. MeterWorks is a family of honest measurement apps: Vibrometer, Sound Meter, Teslameter — Spectrum Analyzer is the fourth.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Emil Deak, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Emil Deak
- Size
- 9.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and German
- Age Rating
4+
- 4+
- Copyright
- © 2026 Digitalbucht - Emil Deak