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 
This reminds me of an unintentional homophone used by a student I had in a remedial English class many years ago. He wrote in a story that someone was “anoid” at something. It took me a while to figure out what it was supposed to be! 😀
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