Sign up, blacklist some websites, and then every time you visit one you will donate 10 cents to a charity of choice. Pick from Girls Who Code, The Red Cross, and Watsi!
Existing online Hearts apps made me download something or signup for an account of some sort--at least, that was the excuse I gave myself for building my own version.
Like many others, I am left guessing as to what my local grocery store has in stock. Instead, let's crowdsource the inventory. No accounts, no emails, just one click to view inventory & another to report it.