Spectrum Analyzer

2,273

Raspberrywood Music & Audio

Offers in-app purchases

Spectrum Analyze gives you real-time spectrum data from the microphone on your Android device.

Features in Free Version
* No Ads
* 44100 Hz sampling rate
* Max frequencies up to 22050 Hz (1/2 sampling rate)
* 8192 samples per spectrum
* ~5.4 Hz Resolution per point
* Peak Detect of whole spectrum and your local window
* Pinch to Zoom
* Tap to Pause
* Max Hold
* Take Screenshot
* Share on Facebook, Gmail and many more

Features in Premium Version.
* Limited time 99 cent app! Will increase price as more features are added.
* Help out the developer to keep adding more features!
* Beta Log Frequency Scale
* Adjustable sample rate from 8000 Hz to 48000 Hz
* Max frequencies up to 24000 Hz (1/2 sampling rate)
* Adjustable Size of FFT up to 100000 samples
* Not limited on Power of 2 sized FFTs (Must be even though)
* Autoscale
* Adjustable Manual Scale

If you purchase the app and don't like it contact me for a refund.

Contact on Reddit: Raspberrywood

Reviews

4.3

2,273 total

5 1,310

4 588

3 185

2 82

1 108

Barry Brevik

Best of it's class I recently installed and evaluated at least 6 (I didn't keep exact count) apps that are competing with this app. I found that this app delivers the feature set that I was looking for in addition to being well executed in terms of stability and user interface. People reading this review may have feature set requirements that differ from mine, so YMMV. I particularly appreciate the zoom and scroll capabilities. Quite often I want to use the entire screen width to view a narrow slice of spectrum in order to re

James Flint

Good start Basic functionality good. I'd really like a save option for a csv file with the data in it as well as image. I also occasionally get an 'error opening audio' problem on Galaxy s5. Small nerd point-fft can only be done on power of 2 length samples yet you can set the value to anything. Are you padding the input data with zeros? Might be best to stick to 256, 512, 1024 etc.?Happy paid for app, price fair for functionality.

Adam Lopez

Great tool Nice app. I use it occasionally has an Audiologist. It checks out well against tuning forks (within 4Hz). It does need an easy way to save images to the gallery, though. Highly recommended. 7/2014: Rating increased to 5-stars since the "save to gallery" issue was fixed. Thanks! I can actually save the images and export them to our EHR database to upload into a patient's chart for reference. Geektastic!

paul judd

Good value for the money. I had read the other reviews and downloaded. I needed a analyser to investigate a high frequency. I did not have my normal professional one to hand. I was surprised at how accurate it was. I used it to investigate a area where customers were saying they could hear the Surveillance tone from our voice alarm system. Our tone is at 20 KHz so I thought this would be very unlikely. I used this program and found a 18 KHz tone present that was not generated by our system.

Ananth Chellappa

Made in USA! After reading reviews for the other apps, I felt this one was the safest. Shows the sad state of Android when we install based on least-potential-harm rather than benefit. Worked fine and a decent interface a well. Good job and hope it makes you a million:-)

Craig Wolfson

Fun and useful! C'mon, guys. Admit it...this is fun to play with. I'm not going to tune my piano or calibrate my audiometer with it, but it's useful to see what the main frequencies are in everyday sounds and noises. Its also a great conversation starter when you start whistling into your phone. I'm using android moto turbo. Very cool.

User reviews

Barry Brevik June 11, 2015

James Flint July 2, 2015

Raspberrywood July 21, 2015

James, I'll put save as csv on my feature list. It will do the FFT with other lengths besides a power of 2. It is not as efficient so that is why I have the power of 2 values as default.

Adam Lopez July 29, 2014

Raspberrywood July 3, 2014

Hi Adam, I fixed the issue with the gallery in the latest version. Please give it a try and let me know if that works for you.

paul judd September 24, 2015

Ananth Chellappa October 25, 2015

Raspberrywood November 18, 2015

Haha! I'll never make a million doing apps, but I'm happy my project is used by so many people!

Craig Wolfson March 15, 2015

Steve Wynveen July 21, 2015

First of all, I think its awesome that you can even do this live FFT on a phone. I found a bug in that if you pause a plot, leave the app and come back, the peak trace disappears and you get a continual pop up message of "Error reading audio. Already Open?". An immediate add on that would really make this app is a draggable cursor or two that would display the value(s) at the cursor. What would put it over the top would be an ability to make waterfall plots and/or color maps of the FFT time history. I already paid a buck. I'd pay $10, easy, for color maps. This is on an HTC One M8.

Raspberrywood July 21, 2015

For the bug, when you leave the app it is supposed to release use of the microphone. Under some odd circumstances it can't access the microphone. What phone did you have? As for the waterfall and cursor, I have those ideas on my feature list! When I get sometime from my day job I'll look at adding some more fun stuff!

Dale Robertson August 12, 2015

Cool, I just want to add, I tested it against a real audio spectrum analyser. It's so close to the grass speck, I was totally blown away. I have Samsung's Galaxy Light phone. Good job sir. And thank you for thinking out of the Box.

Sirpa Oram November 18, 2015

Great app! Just what I needed to measure the hz of the noise that's been waking me up daily in my condo. And you can save a snapshot of it to your gallery. Using on LG. On to resilient channels!

Andrew Stephen August 27, 2016

A fantastic simple app with no ugly surprises I needed something to help me tune my newly repaired sub and this app ticked all the boxes. It even showed me where my satellites were dropping the ball higher in the spectrum! No ads and all of the basic functions I needed were in the free download. I bought the upgrade just to say thanks. It's worth it even for a one-off! :)

Linda Westmore September 30, 2016

Spectrum As yet not entirely sure what it's reading. Or how it works. However, it looks good as I turn various electrical equipment on or off to see the result. Not taken readings outside yet. Need to figure it out first.

RJ McNulty April 30, 2015

Great for finding annoying sound The app does what was it says it does very well. It responds quickly and was helpful for finding a very annoying high pitch sound thank you! I would love to be able to zoom in on the text though it was a little hard to read on my cell phone. Love that I can save images!

Burt Weiner July 19, 2016

It's a great application. For my needs there are only two things missing: 1:A way to lock the parameters and also have it remember the last parameters used when the app is opened. 2: A way to increase the visibility of the graticule lines. I'm using this app on a Samsung NOTE 4.

Andrew S October 25, 2014

Excellent App! Saved my sanity! We have a copy machine at work that was making me and several co-workers crazy with a high pitched squeak being emitted every half second. The boss and the copier repair tech thought me and my co-workers were nuts. I downloaded and installed this app and was clearly able to demonstrate the sound at about 14khz and the real time display showed up pulsing every half second, when we put the copier to sleep the squeaking stopped. Turns out the fuser unit was mis-manufactured. Sanity saved!

Joel David October 24, 2015

This apps help me a lot As a musician, it helps me find any annoying freqs....so keep on developing this apps. I support you guys....God bless you all.

clive perrott April 3, 2016

Really handy tool First thing I discovered was the poor frequency response of my phone's mic! Will have to try with external mics to see exactly how useful this app can be.

Chuck Braun June 9, 2016

This app saved me a lot of money After having a rat/mouse home infestation, I bought a pile of ultrasonic pest repelers. The only way of knowing if they were functioning was to spend hundreds on an analyzer or use this app. It was perfect.

Paul Christidis November 27, 2015

Cool Very cool. Can detect sounds which I can no longer hear. There's a bug whereby if the screen locks or I put the app in the background, the red (persistent) graph is reset.

MMD YLMZ May 23, 2015

MmdYlmz If you have fundemetals of signal analysis you may find out basic mech. Problem on your machine with it.

April 4, 2016

I bought the paid version :) Good it has a "peak hold" function, but text of readout block is too small for a smartphone. Also, what is definition of "Local" parameter? (Eliminate it to make room for larger text of "Peak"?) Fixed # of divisions with adjustable ends (amplitudes & freqs) are NOT user-friendly. Instead, fix highest value. Amplitude: value-per-division of 3, 6 or 12 dB. Freq: div base = log10, log4 or log2; never show below 20 Hz. Div should slide on screen and keep same values and be zoomable. Other ideas: Cumulative RMS average graph; pause and reset buttons shared with peak hold.

Raspberrywood May 18, 2016

Jimmy, thanks for the time for the review. The local is the peak value if you have pinched to zoom over a certain area. You bring up excellent points on a better way to zoom. I have been playing options hope to have something out soon!

Daniel Shaner November 16, 2014

Good free tool This is good for free but however it appears to give out different resonant frequencies on different phones. Probably has some to do with phone microphone quality. So be careful when trusting it exactly.

David Navis October 23, 2015

Great! It works awesome for room correction for church sound systems. I have used it on two church sound systems to adjust the equalizer to fix squeals and other common sounds that plague volunteer operated systems :-).

Jeff D September 13, 2016

Like it but I don'r like the negative dec. Looking for pos dec values to locate source of sound. Do this in options and will certainly buy app and 5 star rate

David Anderson September 20, 2015

Free version is useless The free version locks all the settings and the frequency range stops a zero. If you need to analyze anything below that (which is a significant factor in most applications), you need to buy the full app. Your OK with this app of you only need to look at highs and high mids. I haven't purchased the full app but I suspect that my rating on that version would be considerably different

Raspberrywood November 18, 2015

Hi David, You can pinch to zoom to narrow down where you want to look at.

Bill Piazzetta September 15, 2015

One interesting problem... When you reset the peak, the app makes a clicking sound which affects the new peak... Other than that it's pretty nice.

Kiran Appiah May 23, 2016

Awesome app, paid for the full version, but a few concerns I have. Right now, you can't discern what frequencies are being played because of all the noise at the other frequencies. You could add an option to limit the sensitivity of the app? Also you could add different design options, like a bar representation rather than the line one, and you could add the ability to decrease the amount of frequency bins further - right now you can't adjust the number of bins past a certain value depending on the sampling rate.

Ken Nicholson March 3, 2015

Works great! Works just they way I want it to. Just now I used it to track down a nasty 60Hz hum that was bleeding into my subwoofer. Glad I bought it

coaxialgyro August 6, 2014

Cure for the shoutbanging troll of my son, this app excell's on all levels and gives him an education. Five out of five stars

JUN SU LEE October 18, 2016

I paid money. Why doesn't work? It doesn't unlock even not one time. What's matter with U? How can I solve this problem? Please contact me as quick as possible.

Raspberrywood November 23, 2016

Hi Jun, it needs access to the google servers to unlock the app. If there is an issue during the unlock you could try to uninstall and reinstall and it will reattempt without paying. Email me if you want a refund. Sorry about the issue.

mike thefordprefect January 7, 2016

Works well Peak hold good. Only problem when clearing hold is key click being picked up and displayed (add delay or force click to silent). Otherwise good

Alex Johnston April 7, 2016

Does exactly what you think It works. Not much more to say about it other than to unlock all the options you need to spend $1. Not too bad, and it doesn't really add too much more functionality. Nice app.

Michael Snodderly January 15, 2016

Very cool app. With my hearing loss there are certain frequencies I can no longer hear. This app helps me see the unheard frequencies.

Michael Tepper April 17, 2016

Not accurate. Ap does not accurately represent ambient sound when tested with an android phone checking a pink noise sound file on a high end audio system. Useless

Reshal Luchman September 30, 2016

Analyses frequencies very well BUT For frequencies below approximately 500 Hz, the incorrect frequency is displayed. Therefore, in order to get the correct frequency it must be scaled down.

Raspberrywood November 23, 2016

Hi Reshal, depending on your settings you get a trade off between longer sampling to get more accuracy vs shorter sampling but quicker updating.

Ray Bricknell January 3, 2017

Good Spectrum Analyzer This app looks pretty good and does what it needs to do well. However, the things I'd love to see added are some markers/points with labels when a frequency hits a higher decibel level than previously recorded, the ability to change the color scheme and turn on/off the peak hold.

Corey Bailey October 16, 2014

Great APP! As an Audio Engineer, I'm used to looking at 1/3 or 1/6 octave RTA's (Real Time Analyzer). I went with this app because it offers much finer detail than the traditional 1/3 octave RTA's and gives you a frequency readout of the loudest peak plus the relative SPL. There's a lot of math going here and the program wasn't that easy to write so spend the buck for the extra features that are well worth it. This app will only be as accurate as the mic in your cell phone but that's usually good enough. Wish list: Larger text indicating the peak frequency & SPL or, at least, the ability to size the text. The ability to select which onboard mic the app uses.

Kevin Isaac Perez April 24, 2016

Handy tool for audio technicians I've been using it at church, ironing out little details in our sound system.

Rob Taylor October 8, 2016

Just what I needed. Testing an ultrasonic device, wasn't sure if my mic would pick up the sound. It did, and this app showed me exactly what I needed. Simple and perfect.

Sarang Bedekar August 16, 2014

Great free app for tuning This app is awesome for tuning musical instruments. I used it for tuning home made flute. I cross checked frequencies on keyboard. Pretty accurate. You need to have a good phone though. Works flawlessly on htc ONE.

James Hoyland January 15, 2016

Nearly perfect Looking for an app to use as a teaching tool. The only thing missing is a way to save the raw data for further analysis outside the app.