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.

Doesn't display response with logarithmic table (linear, go figure). Accuracy? I don’t know as I didn't have a meter to test it against.

Handy app to have when you catch yourself thinking twice about a security issue. If you learn the spectrums common frequencies, this app is a guide to a better piece of mind!!

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! :)

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.

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

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.

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.

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

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.

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 :-).

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

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

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.

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.

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.

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

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.

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

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

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

I've been using it at church, ironing out little details in our sound system.

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.

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.

I have a graphic equalizer on my Arduino covering 7 bands (msgeq7) I use this app to see those bands to check that my electronics are working. Great to show lads at work. Straight away it showed 19khz ish spike. Was a UPS power supply. Cool.

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.

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.

I looked around for hardware to do some audio analysis but found this great little free ap that was so easy to use

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

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.

If you need to look at your audio systems frequency response this will do the trick. The interface is simple and configurable

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.

Edit after clarification from the developers: The full version works great up to 24000Hz, not 48000 Hz.

...is the pinhole mic on a phone? I'd like to see options for averaging/smoothing plots, and ability to do a memory vs live differential plot.

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.

Works great. Has never crashed on me. Very small sized app. Love the max history, peak frequency, and manual refresh of max history. Exactly what I needed for analyzing my project.

Why can't I use a smaller buffer than 3840? I want a lower res higher frame rate visualization.

I used it to find out the right frequencies for eliminating feedback with equalization.

Has helped my isolating signal frequencies from various loctations and building profiles for those locations.

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:-)