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What Are Your Favorite Hidden Gem Android Apps?

I'm sure there are countless apps out there that are incredibly cool, interesting, or useful, but just haven't hit the mainstream yet. Maybe it's a productivity tool that's boosted your efficiency, a unique game that's kept you entertained for hours, or a niche app that's catered perfectly to one of your hobbies or interests.

What are some Android hidden gem apps that you've used a bunch or think it's really cool/interesting/useful?

Please share your recommendations, and if possible, a brief description of what the app does and why you find it so valuable.

Looking forward to uncovering some hidden treasures in the Android app world. Thanks in advance for your suggestions!

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  • SDR++ https://github.com/AlexandreRouma/SDRPlusPlus
    Though you'll need additional hardware.

    The best general-use SDR program available on Android. The other apps are just very limited mobile apps, but this gives a full desktop experience. It does support less devices than on desktop, but that's fine. You can run it as server on desktop, and connect to the SDR++ server on your phone.
    Here's a screenshot:

    In the screenshot, it's connected to SDR++ server running on my laptop, to which I have connected RSP1. I couldn't use the RSP1 with SDR++ on Android directly, as it requires proprietary API. But I could for example use RTL-SDR, the most popular SDR. Or maybe Airspy, Airspy HF+, HackRF or Hermes. It can also connect (network) to PlutoSDR, RFspace, RTL-TCP, SDR++ and SpyServer.

    But there's more awesome SDR programs available for Android:

    • SatDump for satellite data processing

    • SDRAngel which tries to do as much as possible in single program (there's no scaling settings, so prepare a stylus or mouse)

    • Welle.io for receiving DAB/DAB+ radio

    • RTL-SDR driver allows you to run RTL-TCP server on the phone. It's also used as a driver by many other apps.

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