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Opensignal – Opensignal is a free to use, advert free mobile connectivity and network signal speed test app.

Connectivity and speed test coverage map
Always know where to find the best coverage and fastest speeds with Opensignal’s network coverage map. The map shows signal strength down to street level using speed test and signal data from local users. With network stats on local network operators, you can check coverage ahead of a trip, check the internet and download strength in remote areas, compare your network to other providers in the area, arrange the best local SIM.

Cell tower compass
The cell tower compass allows you to see which direction the closest or strongest signal is coming from, enabling you to more accurately use broadband and signal boosting technology.
Note: The cell tower compass uses aggregate data and accuracy issues can occur in certain areas. We’re striving to improve this feature and thank you for your patience.
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Wi-Fi SweetSpots – Wi-Fi SweetSpots Observe how Wi-Fi connection speed fluctuates over time, and locate the fastest and slowest Wi-Fi spots in your room!

Discover the perfect spot for your wireless router, access point, or wireless gaming console.

This app is great to know how fast your device is to your wifi router/access point speed actually is. Great to find out local speed test from a device to an router/access point.

Home Assistant – An open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts.