Spectroid is a real-time audio spectrum analyzer offering detailed frequency resolution across the full spectrum. It provides intuitive, interaction-friendly visualization—like pinch-to-zoom—and is accessible as a lightweight tool for musicians, audio enthusiasts, and researchers. With 1,000,000+ downloads and 14K in the last 30 days, it demonstrates steady, ongoing interest.
Pros & Cons
Real-time spectrum analysis with broad frequency coverage
Lightweight and efficient, low resource use
Intuitive pinch-to-zoom interaction for detailed inspection
Clear, readable dBFS-based readings
Non-instrumented spectrum data suitable for exploratory analysis
Lacks built-in spectrogram visuals and FFT-based display options that some competitors offer
Not a calibrated instrument for precise measurements; intended for exploratory use
Export capabilities for calibrated data are not described
About Spectroid
Spectroid is a tools app developed by Carl Reinke.
Download Statistics
Spectroid has been downloaded 4.9 million times. In the last 30 days, the app was downloaded 14 thousand times.
User Ratings
Spectroid is rated 4.55 out of 5 stars. The rating is based on 16 thousand ratings.
App Information
Spectroid is FREE to download. The APK download size is 105.47 kB. The latest version available is 1.1.2. The last update was on August 26, 2022.
Technical Requirements
Spectroid requires Android 4.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play since September 2014.
Description
Spectroid is a real-time audio spectrum analyzer with reasonable frequency resolution across the the entire frequency spectrum.
💬 FAQ 💬
Q: Why are the dB values negative? A: Spectroid uses dBFS (Full Scale) where 0 dB is the maximum power that the microphone can measure, so the decibel values are negative because the measured power is less than the maximum power.
Q: Can I zoom in on the spectrum plot? A: Yes, do a two-finger pinch-to-zoom gesture.
Q: Why are there discontinuities/gaps in the spectrum plot and waterfall? A: Spectroid uses multiple FFTs overlapped in frequency in order to provide better frequency resolution at lower frequencies than a single FFT. The caveat of this method is varied impulse response and minor discontinuities in frequency. The upside is that it can efficiently produce a spectrum that better matches the frequency resolution of human audio perception. It's still probably not as good as your ears though!
Q: Can I export the spectrum data? A: Spectroid doesn't make your device a calibrated instrument. If you need the spectrum data then you should be using an actual spectrum analyzer rather than an app on your mobile device.
Recent changes: ◆ Improve usability on high-density displays
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I use it all the time for music/audio projects. Great for when you need to know what frequencies you're hearing. Would love some options such as viewing custom bandwidths or adjusting the view for how much time the spectrogram is showing.
★★★★★Protik Chanda· Nov 17, 2025
Idea for a feature: Please add a feature to the app, so it can load a target FR curve. This can make this app super useful for manually tuning audio systems or room acoustics. For example use Squiggling as a reference for targets like Harman which uses IEM and Headphones. But I guess there might be such targets for Room acoustics and sound systems as well. This simple feature can be really useful
★★☆☆☆IT IZME· Aug 6, 2026
I got this to find the jerk neighbor using hi frequencies to control another neighbors dog. Its reads 18 -20khz. Not ultrasonic. The problem I see with this app is ALL the Peak markers are forced to be in the exact same area, within a few hertz, because of ambient sounds. Would help if there was a way to put the markers inside a specific range, entered into a min & max box. Otherwise, no complaints. Now, off to get an external mic & parabolic, to go find this A H
★☆☆☆☆Joe· Feb 25, 2026
it's wonderful, I've never been more intouch with what frequencies can do to a human.
Google Play Rankings for Spectroid
This app is not ranked
Technologies used by Spectroid
1 permissions
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Trust & Safety: Spectroid requests android.permission.RECORD_AUDIO to access the microphone for real-time spectrum analysis. This is standard for audio analysis apps. No additional sensitive permissions are listed.
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