The best free WiFi analyzer for Mac is often already on your computer: the tool built into macOS. However, if you need deeper visual insights like heatmaps or detailed channel graphs, third-party options like NetSpot and WiFi Explorer are the top choices for personal and professional use. Top WiFi Analyzer Mac Free Downloads

While many apps use a "freemium" model, these tools provide the best free functionality for troubleshooting and optimizing your network: Use Wireless Diagnostics on your Mac - Apple Support