iStumbler
iStumbler is a network scanning and discovery tool for macOS that identifies nearby Wi-Fi networks, Bluetooth devices, and other wireless signals. It displays detailed information about network SSIDs, signal strength, security settings, channels and MAC addresses, making it useful for IT professionals, network administrators and users diagnosing wireless connectivity issues. The app includes features for location estimation of detected networks and devices, and supports exporting scan results.
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1 suggestioniStumbler was discontinued by its developer some years ago and no longer receives updates. The current version (103.43) is Intel-only — the app plist confirms x86 architecture only and no native Apple Silicon build has ever been released. While the Intel build still runs under Rosetta 2 today, Apple will remove Rosetta 2 support in macOS 28 (September 2028), and iStumbler will stop launching entirely at that point. For diagnosing Wi-Fi networks and signal strength on Apple Silicon Macs, consider using the built-in Wireless Diagnostics tool (hold Option and click the Wi-Fi icon in the menu bar, then select "Wireless Diagnostics"), which is free and updated as part of macOS. For more detailed scanning, third-party alternatives like NetSpot or WiFi Explorer Pro offer native Apple Silicon builds and continue to receive active development, though they are paid options.
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