From (an) idea to (a) successful startup within 1 month!
closed as primarily opinion-based by TrevorD, FumbleFingers, Dan Bron, user140086, tchrist♦ Jul 23 '16 at 15:05
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This is an opinion-based answer, so may be shot down, but I do build web sites.
The omission of the indefinite article is common usage in English titles and slogans, whether or not it is ungrammatical. As an example, when I did a Google search for “From mouse to man” I got eight hits on the first page (most in a scientific context), whereas when I searched for “From a mouse to a man” I got none. Not quite the ad slogan, but I’m sure I’ve seen things like “From weakling to superman in twenty-four hours!” Also, the popular phrase “From hero to zero”.
A banner slogan of the type you quote needs to be as snappy as possible so it demands the omission of the articles.
But note that normal English style would require you to spell out the numeral ‘1’ either as ‘one’ or ‘a’. Although you can break this rule for slogans (I’d certainly use ‘24 hours’ in my example above) I think that in this slogan the numeral ‘1’ would look odd. I would use the longer ‘one’ as it provides more visual emphasis for what is a key word, and you can add even more emphasis with italics or colour if you wish.