If you have an Android phone or tablet, consider DSLRcontroller, I think it's around USD $10 on the Google play store.
Works best wired, you'll need a USB host (also known as OTG, on the go) cable.
Yes, it works with 6D Wi-Fi, but not satisfactorily.
I have it on three phones, bought an ASUS Memo tablet primarily for this app, one purchase, all my androids. It was fine on the Galaxy S4, is marvelous on the tablet.
I've tried focus stacking, pleased with the ease and the results. Intervalometer functions are coded in, HDR, everything I can think of that I'd want to do tethered.
Viewing Canon's 10x live view on the Asus 10" tablet is great for close and critical focusing.