We recently came across this review by Bolligan Airsoft. They do a great job reviewing the Inteliscope app with SEEK® thermal vision. Check out their website for more great reviews.
Inteliscope is a durable Smartphone Mount and Free App that brings critical shooting and targeting information for faster (and safer target) acquisition.
Inteliscope gives you these unique airsoft advantages:
Image and video credit of Bolligan Airsoft