Can swordtails live with ramshorn snails?

Verdict
Yes

Yes. Swordtails and ramshorn snails get along in the same tank. Both are fine at 72–79°F. Plan on at least 30 gal.

SwordtailSwordtail72–79°F · pH 7–8.3 Ramshorn snailRamshorn snail70–80°F · pH 7–8

Why it works

Water side by side

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

Size to scale

Swordtail · 5 inRamshorn snail · 1 in0"1"2"3"4"5"6"
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

SwordtailRamshorn snail
Temperature72–79 °F70–80 °F
pH7–8.37–8
Adult size5.0 in1.0 in
Minimum tank30 gal5 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleBottom
GroupGroups of 3+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for swordtails

All swordtail tank mates

Better tank mates for ramshorn snails

All ramshorn snail tank mates

Questions

Can swordtails live with ramshorn snails?

Yes. Swordtails and ramshorn snails get along in the same tank. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both swordtails and ramshorn snails?

72–79 °F. Swordtails need 72–79 °F, ramshorn snails need 70–80 °F.

What size tank do swordtails and ramshorn snails need together?

At least 30 gal, set by the swordtail. Add space for each extra fish.