FFT Audio Spectrum Analyzer with Weighting Filters. Enjoy as a Music Mood Light.
mr spectra is an FFT-based audio spectrum analyzer with built-in strobe lights and weight filters (A-, C-, and Z-weighting) that turn music into a dynamic mood light. Rated 4.37 from 82 ratings, this free MUSIC_AUDIO app is not ranked in any top list and shows 10,000+ total downloads with 18 in the last 30 days.
Flexible visuals with multiple scopes and customizable color/display options
No explicit real-time RTA, octave analysis, or calibration workflow listed
Only device microphone input is documented; external mic support is not specified
Not ranked in any top lists
About mr spectra
mr spectra is a music & audio app developed by Sumanta Raha.
Download Statistics
mr spectra has been downloaded 13 thousand times. In the last 30 days, the app was downloaded 18 times.
User Ratings
mr spectra is rated 4.37 out of 5 stars. The rating is based on 82 ratings.
App Information
mr spectra is FREE to download. The APK download size is 2.01 MB. The latest version available is 2.31. The last update was on July 26, 2025.
Technical Requirements
mr spectra requires Android 6.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play August 2020.
Description
mr spectra is an fft based audio spectrum analyzer with strobe lights and built-in weighting filters (A-weighting for human hearing, C-weighting for machine sounds and Z-weighting with no filter).
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I hope devs will install options for audio internal output not only mic output coz dog barkin and cock crowing will enter the simulation process thank you for the app devs
★★★★★Khaled Akbar· Aug 21, 2021
Awesome visualizer it brightens my life Thank you for the response I just forgot to look at the Settings recently 😮🧡🧡🧡 may I suggest the scopes must be color white or gray and has switched for mic or audio internal and background pick up gallery thanks
★★★★★Jason Collins· May 30, 2021
I really like this app. It's especially fun to watch the app while playing music on my phone. I do have to say this app is very accurate with the dB reading. I work at the airport and fueling an Airbus 320 with the airpacs running is at 82dB. My BAFX Decibel meter/Sound pressure wave meter reads the same as this app on my Samsung S10e Android 11. I personally wish I could see a widget or live screen saver if that makes any sense. I love the colors. I want to write more, but I'm at my limit.
★★☆☆☆Robin Sparrow· Apr 27, 2022
Limited frequency range: only goes up to 4000Hz, and you can't adjust it. Frequency range is also locked to a linear scale when it always makes more sense to display frequency logarithmically.
★☆☆☆☆Robert Struzinski· Aug 3, 2025
What good is an audio spectrum app that goes only to 4kHz? Try SOUND ANALYZER APP, it's the only free audio test app that works correctly, you'll need to use an external test tone, but they're free in other apps.
Google Play Rankings for mr spectra
This app is not ranked
Technologies used by mr spectra
mr spectra is requesting 7 permissions and is using 14 libraries.
Show details
Trust & Safety: Permissions include android.permission.ACCESS_NETWORK_STATE, android.permission.FOREGROUND_SERVICE, android.permission.FOREGROUND_SERVICE_MEDIA_PROJECTION, android.permission.INTERNET, android.permission.POST_NOTIFICATIONS, android.permission.RECORD_AUDIO, and a dynamic receiver permission (in.msraha.mrspectra.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION). This set supports background audio processing and updates, but users should review microphone usage and background activity during installation.
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