I built a web app and got interviewed by a newspaper too. The article wasn't factually wrong, but it was poorly written and the tone was bizarre at a few points. The journalist chose to take many long quotes directly from my response emails. I didn't know I would be quoted verbatim so heavily, otherwise I would've written more formally. He also interviewed a professor about my app (a professor in a related field), but the professor hadn't heard of my app and clearly didn't even bother to check it out.
So a little disappointing, but all in all I was happy to get the press. Unfortunately this newspaper also had a policy of not printing links / URLs in their online articles, so anybody reading would have had to search for my site on their own via keywords.
Assume everything you write to a journalist, unless you specify otherwise, will be used as written in their story. You should go out of your way to write statements that you expect them to fancy and essentially copy and paste.
When emailing them, read back over what you've written and re-write sections to make them punchy sentences that could serve as introductions, headlines, captions, anything for their story.