Item-by-item in a sentence as an adjective

SQLite is overall slow if you are writing item-by-item.

Even if you were absolutely exhausted, you still had to go through certain "rituals" to keep the place livable on an item-by-item issue.

Great point about the item-by-item interaction deterring theft.

Google is marketing item-by-item shopping analytics to catalog retailers.

Item-by-item definitions

adjective

separate and distinct from others of the same kind; "mark the individual pages"; "on a case-by-case basis"

See also: individual case-by-case