Allowed and aloud are homophones. It’s a common mistake to use these two in place of each other. (Although I suspect some incorrect uses are because of predictive text functions.) Aloud can be substituted for ‘out loud’; allowed is the past tense of the verb allow.
Aloud
- audibly
Allow
- to permit
- to set aside
- to acknowledge or admit
My tip: aloud is audible; allowed is permitted.
Sources:
Hannah McCall 