Wi-Fi Analyzer

Curious if the community has any recommendations and/or positive experiences to share for a handheld Wi-Fi (802.11a/b/g/n/ac) analyzer. Software/laptop-based solutions can be unwieldy in certain environments. However, given rave reviews, I'm open to the idea as long as it's Mac-compatible. Should be able to show detailed spectra, help locate sources of interference, have mapping capabilities, etc. Thanks!