Can bettas live with platies?

Verdict
Yes

Yes, bettas and platies can live together. Both are fine at 76–80°F. Plan on at least 10 gal.

BettaBetta76–82°F · pH 6.5–7.5 PlatyPlaty70–80°F · pH 7–8.2

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–80°Betta 76–82°Platy 70–80°
The green band is the temperature range both can live in.
456789Both: 7–7.5Betta 6.5–7.5Platy 7–8.2
The green band is the pH both tolerate.

Size to scale

Betta · 2.5 inPlaty · 2.5 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

BettaPlaty
Temperature76–82 °F70–80 °F
pH6.5–7.57–8.2
Adult size2.5 in2.5 in
Minimum tank5 gal10 gal
TemperamentSemi-aggressivePeaceful
Swims atTopMiddle
GroupOne per tankGroups of 3+
DietCarnivoreOmnivore

Better tank mates for bettas

All betta tank mates

Better tank mates for platies

All platy tank mates

Questions

Can bettas live with platies?

Yes, bettas and platies can live together. Both are fine at 76–80°F. Plan on at least 10 gal.

What temperature suits both bettas and platies?

76–80 °F. Bettas need 76–82 °F, platies need 70–80 °F.

What size tank do bettas and platies need together?

At least 10 gal, set by the platy. Add space for each extra fish.