Zoleo is the cheapest device on the market,
but the monthly subscription is more expensive ($20 versus $12 for InReach).
Another potential problem with Zoleo is it is dependent on your phone.
Break you phone, loose your phone, or run out of battery life and Zoleo is restricted to 2 buttons (SOS, "I'M OK buttons)
InReach can be paired with a phone,
but it also works as a stand alone device where you can send custom messages.
ZOLEO has preset the check in message to say “I’m ok” with no way to change it.
InReach allows you 3 different customizable preset messages for different situations.
"Got a bull moose" "Safe Back At Camp" "At the Boat Ramp, Headed Home" for example.
Plus you can send longer detailed text with the InReach as a stand alone device.
ZOLEO has no tracking feature, and no map feature.
With InReach, my family can see exactly where I am on a map thru facebook or email every half hour,
every 8 hours, depending on the user's preference.
Everyone in our moose camp has an InReach and we each hunt solo.
With the InReach it is easy to communicate to each other if one of us needs help.
InReach has amazing battery life...I send a preset message home everynight "Safe Back At Camp",
and after 15 nights of use, still have over 85% battery life.