Spectrum Analyzer+ FFT
Audio Frequency Viewer
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
A more focused analysis-first audio workflow with clearer first-screen guidance, stronger visual hierarchy, and cleaner trend + stats views.
Spectrum Analyzer+ FFT transforms your iPhone into a professional audio frequency analyzer. Using the built-in microphone, it visualizes sound frequencies in real time with a detailed FFT spectrum display.
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. Note: This app analyzes audio in real time for visualization purposes only — it does not record or store any audio.
Key Features:
- Real-time FFT audio spectrum visualization via microphone
- Frequency range from 20 Hz to 20 kHz
- Peak frequency detection with Hz display
- Average dB level per frequency band
- Adjustable dB range for detail viewing
- Smooth animated bar display
- Dark theme optimized for readability
Whether you're a musician tuning instruments, an audio engineer checking room acoustics, or a sound enthusiast exploring frequencies, Spectrum Analyzer+ gives you a powerful visualization tool in your pocket.
Ratings & Reviews
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!
The developer, Kyu-Hee Jang, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Kyu-Hee Jang
- Size
- 72.6 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- Contains
Advertising
- Copyright
- © Copyright 2026 Simon Jang. All rights reserved.
