The standard spelling is all right.
But alright is more common in informal writing, many people consider it incorrect.
Editors and Teachers will always consider it incorrect.
Although it is best to spell it as two words: all right.
TheOpenDictionary
Search for word, phrasal verb or idiom
Phrasal Verb Of The Day
Description
to beat someone in something such as a competition or election by a small amount
Get a FREE WORD, PHRASAL & IDIOM
of the day in your inbox
Meaning
a boundary beyond which one cannot proceed without consequences