RF Analyzer

996 reviews
Content rating
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About this app

Use an OTG (on-the-go) USB cable to connect your HackRF/RTL-SDR to an Android phone/tablet and this app will visualize the RF spectrum (frequency magnitude and waterfall plot)!
Browse through the frequency spectrum just by using scroll and zoom touch gestures. Additional features as of today are:
- Many settings: FFT size, averaging, peak holding, color scheme, ...
- read samples from a file (generated by hackrf_transfer tool or by rtl_sdr)
- AM/FM/SSB audio demodulation
- adjust squelch and channel width
- Record to a raw IQ file compatible with hackrf_transfer, ...
- Bookmarks
- rad1o support

Read the manual for more details: https://github.com/demantz/RFAnalyzer/blob/master/doc/rf_analyzer_manual.md

Due to time constraints the app is currently not actively developed anymore.
I also try to keep the app stable and as bug-free as possible. Bug reports are always welcome and I try to find the time to fix them! Note that there is a logging feature in the settings which helps a lot with trouble shooting any errors.

Interested in the latest updates? Join the beta program: https://play.google.com/apps/testing/com.mantz_it.rfanalyzer

This app uses the INTERNET permission only to connect to the local rtl_tcp instance used by the RTL2832U driver. The WRITE_EXTERNAL STORAGE permission is only used to write log files to the SD card (disabled by default).

In order to use this app you will need:
- A HackRF or an RTL-SDR dongle (this is obvious xD)
- An Android device that either supports USB OTG (please google if your device supports OTG!) or has an USB host port
- An USB OTG cable (costs about 3$) to connect the HackRF/RTL-SDR to your Android device (not needed if your device has a full size USB host port)
- Only for RTL-SDR: The free RTL2832U driver from Martin Marinov (https://play.google.com/store/apps/details?id=marto.rtl_tcp_andro)

The HackRF/RTL-SDR is powered by the Android phone/tablet. Some phones or tablets might not deliver enough power on their USB port to power the HackRF/RTL-SDR (power issues are often caused by low quality USB cables or OTG adapters). Also notice that doing the necessary digital signal processing is very CPU intensive and though I did my best to optimize the algorithms the app still needs a decent device (I recommend 2 CPU cores or more) to run fluently. Please use the 2-hour refund period provided for every Google Play app to test functionality and refund the app if it does not work for your device!

Here is a list of already tested and working devices (may be incomplete):
- Nexus 7 2012
- Nexus 7 2013
- Nexus 5
- Moto G
- Moto G 4G
- Acer A500
- Samsung S3 LTE
- Samsung S4
- Samsung S4 LTE
- Samsung S5
- Samsung Note 3
- Samsung Galaxy Tap S 8.4 & 10.5
- HTC M7
- HTC M8
- LG G2
- LG G3
- Motorola Xoom M601
- Dragon Touch A1X

If the app is working for you and your device is not in this list, please include your phone type in a short rating
and share the good news with other users ;)

Here is a list of devices that were reported NOT to work with this app (may be incomplete):
- Sony Xperia Pro + HackRF (because USB output power is too low -.-)
- Nexus 4 (works only with Y cable and custom ROM to enable OTG support)
- Nexus 9 (Not a power issue, I am still investigating on this)

This application is released under the GNU General Public License v2. It is free software and the source code is
available on GitHub: https://github.com/demantz/RFAnalyzer

The APK package is also available in the git repository and you can download and install it from there. But keep in mind: by downloading the app from the store you will get automatic updates!

Please note that I am not responsible for any legal issues caused by the usage of this application. Be responsible and comply with your local law!
Updated on
Oct 12, 2016

Data safety

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Ratings and reviews

851 reviews
don t
January 10, 2023
Works for a few seconds then static. I downloaded the rtl-str driver and said it installed correctly. Then I downloaded RF analyzer. Set it up properly, but the only station I could get was 1 FM, and 1 WX. Everything else was static. And then it would only work for a few seconds and disconnect. I'm on a galaxy s21 ultra so it couldn't be the phone. I guess it's time to give up.
3 people found this review helpful
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Turbine Dynamics
November 19, 2021
Very nice implementation, I actually prefer to use this over sdr touch and this is not only free, but sounds much cleaner on most of the frequencys I've tested on. Simple FM broadcast, Noaa. Be happy to pay for this with additional decoders but understand it's technically listed as an analyzer. Maybe a mode selection? Good work regardless!
45 people found this review helpful
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Dave Todd
May 26, 2020
Well it would have been exactly what I was looking for except it refuses to go down into the ham bands. I like to play with old military radios and rather than deal with those clunky chunky knobs trying to find something I bought an SDR so I could waterfall and find something to aim the set at. This fit the bill until I got it finally down into the ham bands and it kept telling me that it can't go there. Pointless to make software it doesn't go where the Hardware can
72 people found this review helpful
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What's new

version 1.13
- Bookmark frequencies
- Including hackrf_android 1.12 (support for rad1o)
- Select unit for frequency and bandwidth (MHz,kHz,Hz) in jump dialog
- Support for Marshmallow permission model
- Many bugfixes