Can swordtails live with kissing gouramis?

Verdict
Yes

Yes, swordtails and kissing gouramis can live together. Both are fine at 72–79°F. Plan on at least 55 gal.

SwordtailSwordtail72–79°F · pH 7–8.3 Kissing gouramiKissing gourami72–82°F · pH 6–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Swordtail 72–79°Kissing gourami 72–82°
The green band is the temperature range both can live in.
456789Both: 7–8Swordtail 7–8.3Kissing gourami 6–8
The green band is the pH both tolerate.

Size to scale

Swordtail · 5 inKissing gourami · 10 in0"2"4"6"8"10"
Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

SwordtailKissing gourami
Temperature72–79 °F72–82 °F
pH7–8.36–8
Adult size5.0 in10.0 in
Minimum tank30 gal55 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 3+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for swordtails

All swordtail tank mates

Better tank mates for kissing gouramis

All kissing gourami tank mates

Questions

Can swordtails live with kissing gouramis?

Yes, swordtails and kissing gouramis can live together. Both are fine at 72–79°F. Plan on at least 55 gal.

What temperature suits both swordtails and kissing gouramis?

72–79 °F. Swordtails need 72–79 °F, kissing gouramis need 72–82 °F.

What size tank do swordtails and kissing gouramis need together?

At least 55 gal, set by the kissing gourami. Add space for each extra fish.