Spectroid is a real-time audio spectrum analyzer by Carl Reinke that delivers high-resolution frequency analysis across the full spectrum. It’s free to use and widely adopted, with 1,000,000+ total downloads and 15K in the last 30 days, though it is not ranked in any top list.
Pros & Cons
Real-time analysis with high-frequency resolution across the spectrum
Free to use with no upfront cost
Large, established user base and long app age
Intuitive pinch-to-zoom and visual FFT plots
Not a calibrated instrument; measurements are for visualization, not professional calibration
Exporting spectrum data for calibrated analysis is not intended
Lacks dedicated time-domain analysis or meter-style measurement features
About Spectroid
Spectroid is a tools app developed by Carl Reinke.
Download Statistics
Spectroid has been downloaded 4.8 million times. In the last 30 days, the app was downloaded 15 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 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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Simple and intuitive, you can clearly see what frequency a sound is. fft all the way
★★★★★Aniket Sen· Apr 17, 2026
Please add support for selecting different audio inputs (phone mic, system audio, combined input, or external/headphone mic). Also, the graph is always raised due to background noise, please include a baseline/noise floor calibration option, so it stays flat and only shows sounds above the ambient noise. It would also be very helpful to have the ability to record audio along with the graph for later analysis. Overall, it's a really good app.
★★★★★Ian Richter· Dec 2, 2025
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.
★☆☆☆☆Joe· Mar 31, 2026
The app has been compromised by playstore.it should clearly tell frequencies, but its settings are set till you pay the vultures! don't use it it's not accurate.
★☆☆☆☆Joe· Feb 25, 2026
it's wonderful, I've never been more intouch with what frequencies can do to a human.
★★☆☆☆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
Google Play Rankings for Spectroid
This app is not ranked
Technologies used by Spectroid
1 permissions
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Trust & Safety: Spectroid requests only the RECORD_AUDIO permission, which is essential for real-time spectrum analysis. The app is marked as is_proguarded, and no other sensitive permissions are listed. It is free to use and maintained by Carl Reinke in the United States.
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