# Audio Spectrum Analyzer > iOS audio spectrum analyzer for visualizing frequencies up to 20 kHz. (iPhone/iPad app by Black Cat Systems.) - Source: https://appshunter.io/ios/app/audio-spectrum-analyzer/id373620982 (this page in markdown: same URL + `.md`) - Developer: [Black Cat Systems](https://appshunter.io/developer/301047032) - Category: Utilities, Music - Price: $3.99 - Rating: 3.90/5 from 52 App Store ratings · 68 written reviews indexed - Age rating: 4+ - Requires: iOS 6.0 · 1 MB - Languages: American English - Released: 2010-06-10 - Data updated: 2026-09-03 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/audio-spectrum-analyzer/id373620982/reviews.md ## What is Audio Spectrum Analyzer? Spectrum Pad turns your iPad, iPhone, or iPod Touch into an audio spectrum analyzer. Frequencies up to 20 kHz can be displayed. You can control the displayed frequency span, as well as the FFT size, from 1024 to 262144 bins. A logarithmic display of the entire 10 Hz to 20 kHz frequency range is available, and the graph fill mode can be turned on and off, as well as the display of up to five frequency markers. Filtering (averaging) can be applied to the spectrum, to smooth out variations. You can turn on the Peak Hold to make it easier to see transient events, as well as adjust the decay rate. Swiping with two fingers lets you adjust the brightness of the spectrum or the graticule grid overlay. Tapping three times with two fingers will save a screenshot to your Photos. One of several user selectable window functions can be used: Rectangular Hanning Hamming Tukey Cosine Lanczos Blackman ## Key features - Frequency analysis up to 20 kHz - Adjustable frequency span and FFT size - Logarithmic frequency display - Graph fill mode toggle - Up to five frequency markers - Spectrum filtering and averaging - Peak hold with adjustable decay rate ## Chart rankings - #188 in Top Paid · Utilities (US App Store) ## Recent user reviews (10 of 68) All indexed reviews: https://appshunter.io/ios/app/audio-spectrum-analyzer/id373620982/reviews.md ### 5/5 — Love it! *2021-05-17* Very handy in recording studio. ### 1/5 — 不正確 *2020-11-26* 金を返して欲しい ### 3/5 — Needs averaging *2020-01-15* Very useful, but it would be so much better if it could do a running average of the spectrums. This would help to pull signals out of the noise floor. ### 2/5 — Problems with newer iPhones *2019-09-16* No way to exit on iPhones without a Home button ### 1/5 — Doesn’t work *2019-03-29* Doesn’t work with iPhone XR. Looks like it has t been updated in years. Not worth any money ### 1/5 — stopped working after about 3 minutes *2019-03-06* but hey, does anyone’s design actually work nowadays? ### 1/5 — This app is sold with false pretenses! *2019-02-03* Buyer beware! This is listed under Spectrum Remote. I wanted to control our TV using my phone. This does not do that. I asked for a defund and was told NO! ### 5/5 — Got noise? *2019-01-30* Excellent tool for analyzing sound background noise, and data transmission modes. Features allow zooming in and out and peek hold. ### 5/5 — Just the thing... *2019-01-15* Intuitive, simple, powerful. Read the FAQ, which is the user guide/manual. ### 1/5 — Langsam *2018-12-04* Bei nur 8k Auflösung ist die App auf dem iPhone 7 extrem langsam, für mich nicht zu gebrauchen ## Frequently asked questions about Audio Spectrum Analyzer ### What does this app do? This application transforms your iPad, iPhone, or iPod Touch into a functional audio spectrum analyzer. It allows you to visualize audio frequencies up to 20 kHz, providing detailed insights into sound characteristics. ### What are the key features for analyzing audio? Key features include adjustable frequency span and FFT size (from 1024 to 262144 bins), a logarithmic display of the 10 Hz to 20 kHz range, graph fill mode, up to five frequency markers, spectrum filtering for smoothing, and a peak hold function with adjustable decay rate. ### Is this app free to use? Based on the provided information, this application is a paid app. It does not have in-app purchases or advertisements, indicating a one-time purchase model. ### What devices is this app compatible with? The app is designed for iOS devices, specifically mentioning iPad, iPhone, and iPod Touch. It leverages the device's microphone to capture and analyze audio. ### How can I use this app for audio analysis? You can use this app to monitor the frequency content of various audio sources, such as music, environmental sounds, or instrument output. The customizable display and analysis tools help in identifying specific frequencies, their intensity, and transient events. ## Version history (last 5 releases) ### 1.5 — 2017-04-26 This update from Apple will improve the functionality of this app. No new features are included. Updates for iOS 10.3 Adds Blackman-Harris window Adds volume indicator ### 1.4.2 — 2014-11-06 Bugfixes for iOS 8.1: the app could crash on launch or not save settings. ### 1.4.1 — 2014-10-05 Added option to take a screenshot by tapping three times with two fingers. Updates for iOS 8. ### 1.4 — 2014-08-26 Added Peak Hold Added brightness control for spectrum and graticule. ### 1.3 — 2013-11-21 Fixed several bugs. Added user selectable filtering/averaging. Added selectable window functions: Rectangular Hanning Hamming Tukey Cosine Lanczos Blackman ## Apps similar to Audio Spectrum Analyzer | App | Rating | Price | Category | | --- | --- | --- | --- | | [Sonic Tools SVM](https://appshunter.io/ios/app/sonic-tools-svm/id1245046029) | 4.7 (6,672) | Free | Utilities | | [Sound Spectrum Analysis](https://appshunter.io/ios/app/sound-spectrum-analysis/id1434975523) | 3.6 (41) | Free | Utilities | | [Decibel Meter - Sound Analyzer](https://appshunter.io/ios/app/decibel-meter-sound-analyzer/id1579747105) | 3.5 (54) | Free | Utilities | | [Audio Frequency Analyzer](https://appshunter.io/ios/app/audio-frequency-analyzer/id684641742) | 3.7 (3) | $9.99 | Utilities | | [dB Meter & Spectrum Analyzer](https://appshunter.io/ios/app/db-meter-and-spectrum-analyzer/id733773616) | 4.7 (865) | $29.99 | Utilities | | [Decibel X:dB Sound Level Meter](https://appshunter.io/ios/app/decibel-xdb-sound-level-meter/id448155923) | 4.6 (161,260) | Free | Utilities | ## More apps by Black Cat Systems - [WireCalc](https://appshunter.io/ios/app/wirecalc/id301047029) - [Transmission Line Calc](https://appshunter.io/ios/app/transmission-line-calc/id302734281) - [RF Link Calc](https://appshunter.io/ios/app/rf-link-calc/id303034300) - [dB Calc](https://appshunter.io/ios/app/db-calc/id303470503) - [Drill Calc](https://appshunter.io/ios/app/drill-calc/id304434324) - [Photon Calc](https://appshunter.io/ios/app/photon-calc/id304436071) All apps by Black Cat Systems: https://appshunter.io/developer/301047032 ## Related topics [audio systems](https://appshunter.io/ios/topics/audio-systems) · [spectrum analyzer music](https://appshunter.io/ios/topics/spectrum-analyzer-music) · [spectrum analyzer wireless](https://appshunter.io/ios/topics/spectrum-analyzer-wireless) · [audio spectrum analyzer pro](https://appshunter.io/ios/topics/audio-spectrum-analyzer-pro) · [spectrum analyzer frequency](https://appshunter.io/ios/topics/spectrum-analyzer-frequency) · [spectrum analyzer light](https://appshunter.io/ios/topics/spectrum-analyzer-light) · [spectrum analyzer audio](https://appshunter.io/ios/topics/spectrum-analyzer-audio) · [ieee spectrum](https://appshunter.io/ios/topics/ieee-spectrum) --- *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 2026-09-03.*