Pro Medicus, the healthcare software developer, is the best-performing stock in the ASX 200 this financial year, narrowly besting San Francisco-headquartered family monitoring app Life360.

There was less than 1 per cent between the two investor favourites earlier this week. That was until a 2.5 per cent gain on Friday pushed Pro Medicus ahead, tallying a 118.7 per cent return in the 12 months to the end of June.