They are arboreal frogs associated with scrub forest habitats.

They breed in pools, with eggs deposited on vegetation.

[1] Chirixalus simus are small frogs that grow to a snout-vent length of 19–23 mm (0.75–0.91 in) in males and about 27 mm (1.1 in) in females.

Male frogs call from grasses about 1 metre above the water.

They make foam nests that hang above the water.