Wifi Analyzer is one of the must-have apps for Android. You will love it if you have a wireless router at home. With beautiful graphs and GUI it shows the strength of the different wireless networks in your neighborhood and helps you choose the wireless channel that gives best signal strength for your home wireless network.
Wifi Analyzer can be installed from here. Some of its most important menu items are:
Channel graph: This shows the signal strengths and channels occupied by the wireless networks in your neighborhood. You can visually see how strong your own network is and if its occupying a crowded channel.
Channel rating: Choose your wireless network it and the app suggests a sorted list of channels you can switch it to. The higher the rating the better will be your signal strength.
AP list: Shows more details about each of the networks, including manufacturer of the wireless router used by those networks.
Signal meter: This is very useful if you want to check the strength of your wireless network at different places in your home. This can help you decide which is the best place to keep your wireless router.
Tried with: Wifi Analyzer 3.6.6, Android 4.4.2 and Moto G