Question: what watch is compatible with iphone 8?
Answer: Fitbit Versa Smart Watch, Black/Black Aluminium, One Size (S & L Bands Included) ... 
Samsung Gear S3 Frontier Smartwatch (Bluetooth), SM-R760NDAAXAR. ... 
Amazfit BIP smartwatch by Huami with All-Day Heart Rate & Activity Tracking, Sleep Monitoring, GPS, 30-Day Battery Life, Bluetooth (Cinnabar Red), One Size.