# Spectrum Analyzer+ Audio FFT — Find Peak Hz, Hum & Room Modes > Real-time audio frequency analyzer with FFT spectrum display. (iPhone/iPad app by Kyu-Hee Jang.) - Source: https://appshunter.io/ios/app/spectrum-analyzer-plus-audio-fft/id6760830858 (this page in markdown: same URL + `.md`) - Developer: [Kyu-Hee Jang](https://appshunter.io/developer/1587578867) - Category: Utilities, Productivity - Price: Free - Rating: 2.30/5 from 3 App Store ratings - Age rating: 17+ - Requires: iOS 17.0 · 69 MB - Languages: American English - Released: 2026-03-31 - Data updated: 2026-10-03 - Monetization: ad-supported - User reviews in markdown: https://appshunter.io/ios/app/spectrum-analyzer-plus-audio-fft/id6760830858/reviews.md ## What is Spectrum Analyzer+ Audio FFT? Spectrum Analyzer+ Audio FFT shows the live frequency spectrum of any sound your iPhone microphone hears, then lets you capture a 5-second average and read the result: the strongest frequency in Hz, the top components and where the energy sits. ▶ See the spectrum live • 32 bands from 20 Hz to 20 kHz, computed with a 2048-point FFT • Four views: Bars with peak hold, Line, Waterfall and Spectrogram • Peak frequency and peak level update as you listen • Min / Max traces in the Bars view, tap a bar for a cursor readout, freeze the display to study it • Adjustable dB range from 30 to 120 dB ▶ Capture 5 seconds, get an answer Tap Capture 5 s under the graph and hold the sound steady. The app power-averages the spectrum over five seconds and shows a result card: • Strongest component in Hz, with the musical note and cents in Voice mode • Up to three top components with their levels • Share of the detected energy in the low, mid and high part of the selected range • Strongest band level and the FFT resolution of the measurement If the sound is too quiet in that range, the card says so instead of inventing a peak. ▶ Compare before and after Save a capture as a reference (up to 10). Make a change — move a speaker, add treatment, adjust a machine — capture again in the same mode and the card shows the average band-level difference in dB. References can also be overlaid on the live spectrum. ▶ Pick the job • Voice: 80–4000 Hz, shows the note of the strongest pitch • Machine: 20–2000 Hz, looks for 50/60 Hz mains hum and its harmonics • Room: 20–500 Hz, the low end where room modes build up ▶ Export and share • Export a CSV of the live spectrum or of a 5-second capture • Share a short text summary of a capture ▶ Extras • Calibration offset from −20 to +20 dB in 0.5 dB steps to line up with a reference meter • Pink noise generator, unlocked for 24 hours by watching a short ad • Interface in 30 languages ▶ Good to know Levels are relative to the microphone's full scale (dBFS). A phone microphone is not a certified sound level meter, so use the numbers to find frequencies and compare changes, not for compliance measurements. Audio is analysed in memory while you listen and is not saved as a recording. For musicians checking a tone, home studio and hi-fi owners chasing a boomy note, and anyone tracking down a hum from a fridge, fan or transformer. ## Key features - Real-time FFT audio spectrum visualization - Frequency range 20 Hz to 20 kHz - Peak frequency detection - Average dB level per band - Adjustable dB range - Dark theme ## Frequently asked questions about Spectrum Analyzer+ Audio FFT ### What is Spectrum Analyzer+ FFT? Spectrum Analyzer+ FFT transforms your iPhone into a professional audio frequency analyzer. It visualizes sound frequencies in real time with a detailed FFT spectrum display, showing amplitude and peak frequencies. ### Does Spectrum Analyzer+ FFT record audio? No, Spectrum Analyzer+ FFT analyzes audio in real time for visualization purposes only. It does not record or store any audio data. ### What is the frequency range of Spectrum Analyzer+ FFT? The analyzer captures live audio through the microphone and breaks it down into individual frequency bands, showing the amplitude of each frequency from 20 Hz to 20 kHz. ### What devices does Spectrum Analyzer+ FFT support? Spectrum Analyzer+ FFT is supported on iPhone and iPod devices. ### What is the age rating for Spectrum Analyzer+ FFT? Spectrum Analyzer+ FFT has an age rating of 17+. ### How often is Spectrum Analyzer+ FFT updated? The latest version, 1.0.15, was released on June 18, 2026, indicating recent updates. The app was initially released on March 31, 2026. ### Does Spectrum Analyzer+ FFT have ads? Yes, Spectrum Analyzer+ FFT contains advertisements. ### What is the user rating for Spectrum Analyzer+ FFT? Spectrum Analyzer+ FFT has a user rating of 2.3 stars based on 3 ratings. ## Version history (last 5 releases) ### 1.0.29 — 2026-09-25 • Capture 5 s: average the spectrum for five seconds and get a result card with the strongest frequency, top components and energy split • Save a capture as a reference and see the dB difference on the next one • Start and Capture now sit right under the graph • Czech, Danish, Finnish, Hebrew and Dutch now show their own language ### 1.0.28 — 2026-08-31 Store screenshots now show the 32-band FFT, waterfall, and spectrogram in 30 languages. ### 1.0.27 — 2026-08-22 Reset now fully stops the microphone. Before, tapping Reset could leave the mic still listening even though the button had returned to Start — now recording stops the instant you reset, and the button always matches what the microphone is really doing. Thanks for the reviews and feedback! ### 1.0.26 — 2026-08-16 New: save the current spectrum as a reference, then see it overlaid on the live view with the difference in dB. Treat a room, move a speaker, swap a cable — and know whether it actually helped. Thanks for the reviews and feedback! ### 1.0.25 — 2026-08-15 Fixed the decibel scale: levels were reading about 6 dB low because the analysis window's gain was not being accounted for. Peaks, averages and CSV exports are now correct. If you had dialled in a calibration offset to compensate, please reset it. Thanks for the reviews and feedback! ## Apps similar to Spectrum Analyzer+ Audio FFT | App | Rating | Price | Category | | --- | --- | --- | --- | | [SpectralScan Audio Analyzer](https://appshunter.io/ios/app/spectralscan-audio-analyzer/id6762024331) | 4.9 (10) | Free | Utilities | | [Live Spectrum Analyzer](https://appshunter.io/ios/app/live-spectrum-analyzer/id6804594590) | — | Free | Utilities | | [Decibel Meter X](https://appshunter.io/ios/app/decibel-meter-x/id6478142605) | 4.8 (49) | Free | Utilities | | [Spectrum Analyzer: Audio RTA](https://appshunter.io/ios/app/spectrum-analyzer-audio-rta/id6781270627) | 1.0 (1) | Free | Utilities | | [FNam FFT Spectrogram Analyzer](https://appshunter.io/ios/app/fnam-fft-spectrogram-analyzer/id6759438376) | — | Free | Utilities | | [RTA01](https://appshunter.io/ios/app/rta01/id6793456897) | — | Free | Utilities | ## More apps by Kyu-Hee Jang - [Calculator+ Tip Tax BMI Unit](https://appshunter.io/ios/app/calculator-plus-tip-tax-bmi-unit/id1587591476) - [QR Lens+ Barcode Scanner Pro](https://appshunter.io/ios/app/qr-lens-plus-barcode-scanner-pro/id1590631012) - [Decibel Meter+ Sound Level dB](https://appshunter.io/ios/app/decibel-meter-plus-sound-level-db/id1593197145) - [Tremor Vibration Meter](https://appshunter.io/ios/app/tremor-vibration-meter/id6759666731) - [Lux Light Meter · Photometer](https://appshunter.io/ios/app/lux-light-meter-photometer/id6759858193) - [Barometer: Air Pressure](https://appshunter.io/ios/app/barometer-air-pressure/id6759883097) All apps by Kyu-Hee Jang: https://appshunter.io/developer/1587578867 ## Related topics [analyzer plus](https://appshunter.io/ios/topics/analyzer-plus) · [sounn vr audio analyzer](https://appshunter.io/ios/topics/sounn-vr-audio-analyzer) · [fft analyzer](https://appshunter.io/ios/topics/fft-analyzer) · [audio spectrum viewer](https://appshunter.io/ios/topics/audio-spectrum-viewer) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-03.*