As Terran
Make:
Siege Tank
Marauder
BansheeTank range and focused Marauder fire beat Hellbats before they connect.
Open in the counter tool with Hellbat tagged ->As Protoss
Make:
Immortal
Stalker
SentryForce fields and batteries buy time for Immortal damage.
Open in the counter tool with Hellbat tagged ->As Zerg
Make:
Roach
Queen
BanelingRoaches are the stable answer; Banes help when Hellbats unload clumped.
Open in the counter tool with Hellbat tagged ->
Marine
Reaper
Hellion
Widow Mine
Cyclone
Thor
Viking
Medivac