Yes. This is a fine example of a male Caltoris bromus.
Caltoris bromus. Antenna with prominent pale area.
FW subapical spots typically two.
FW cellspot two.Very rarely the upper cellspot may be reduced or absent. UnH uniformly brown with ochreous overlay.
The female is the only species here that may have HW spots in space 2 & 3.
I am afraid your attachments do not show up as images.
5. https://www.inaturalist.org/observations/150484243
This would be Caltoris bromus female.
Note also in Caltoris bromus & malaya the FW & HW ground colour are about the same.
In C. cahira & cormasa the HW is a deeper darker shade.
Addendum Here the male C. bromus is without HW spot & the female usually but not always have them.
A recent study in Nepal 2022, shows both sexes (?always) have HW spots .
It is thus possible that the occasional male here may have HW spot.
1. Pelopidas conjuctus male.
FW spots yellow & at least twice as large as the white HW spots.
Upper cellspot if visible often large & oblong.
Many misidentification on the web.
2. Baoris female presumbly B. farri.
The pale patch at the HW cellend is diagnostic if present.
Note also the more strongly banded abdomen.
In other countries, B. farri female (& often male as well) is fully spotted thus the name Complete Paintbrush Swift. https://www.ifoundbutterflies.org/si...02226b-2_0.jpg https://www.ifoundbutterflies.org/si...ra_ad839_0.jpg
In Singapore most females are not fully spotted. So an element of doubt here.
3. Caltoris cormasa male.
Typial example. Note the reddish tone.
4 Caltoris malaya male.
The male is rusty brown & the paler female ochreous brown.
3. Idea leuconoe clara. The usual ssp kept in Butterfly houses is ssp clara from Taiwan.
The interneural (between the veins) arrowheads on the HW are very small.
There is probably an escapee population in Singapore.