If you’re getting connectivity issues thanks to structural challenges at home, I feel your pain! For WiFi design tools, besides what’s already mentioned, you might wanna take a look at Acrylic Wi-Fi Home.
Acrylic is pretty solid for home use and might be less of a resource hog compared to NetSpot. It gives a detailed analysis of your existing WiFi network, showing signal strength, connected devices, interference from other networks, and the best channels to use. It’s got this simple interface too, so you’re not scratching your head over complex settings.
But here’s the kicker: while it’s great for diagnosing issues, it’s not as advanced in providing solutions like AP placement. Big red cross there if you need a thorough planning tool. It’s more of a diagnostic tool.
Not to forget Ekahau Heatmapper, like techchizkid mentioned. Sure, it’s geared towards more advanced or enterprise scenarios, but it’s how detailed it gets that rocks. It maps out WiFi coverage super precisely, so you can see where the signal drops dead due to walls and furniture. It’s like having the eyes of a WiFi god 
. Plus, its reports can be pretty helpful to pinpoint problems. Expensive tho!
Just to throw another option into the mix – Wi-Fi Analyzer. It’s one more simplistic, more of a real-time analyzer, but it’s open-source and did I mention free? 
It doesn’t provide detailed site surveys like NetSpot, but it’s wonderful for quick checks and troubleshooting.
And hey, consider trying NetSpot first if you haven’t already, especially for a more balanced feature set. Super easy to use and does the smart diagramming which is clutch when dealing with structural challenges. The URL for checking out more info: NetSpot.
At the end of the day, it’s all about what you need and how technical you want to get with your network planning. Stick to the basics or go full nerd-mode, you’ll be the WiFi master of your domain in no time! 
