Can swordtails live with boesemani rainbowfish?

Verdict
Yes

Yes. Swordtails and boesemani rainbowfish get along in the same tank. Both are fine at 75–79°F. Plan on at least 30 gal.

SwordtailSwordtail72–79°F · pH 7–8.3 Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8

Why it works

Water side by side

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

Size to scale

Swordtail · 5 inBoesemani rainbowfish · 4 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

SwordtailBoesemani rainbowfish
Temperature72–79 °F75–82 °F
pH7–8.37–8
Adult size5.0 in4.0 in
Minimum tank30 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for swordtails

All swordtail tank mates

Better tank mates for boesemani rainbowfish

All boesemani rainbowfish tank mates

Questions

Can swordtails live with boesemani rainbowfish?

Yes. Swordtails and boesemani rainbowfish get along in the same tank. Both are fine at 75–79°F. Plan on at least 30 gal.

What temperature suits both swordtails and boesemani rainbowfish?

75–79 °F. Swordtails need 72–79 °F, boesemani rainbowfish need 75–82 °F.

What size tank do swordtails and boesemani rainbowfish need together?

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