Invisible widgets work on the lock screen! I got this because I wanted an invisible item above the time on my lock screen. The iPhone by default has the full date (Saturday, April 27), and anything else one adds shortens the date (Sat 27) and adds other information after it (next event, alt. calendars, time zone, &c.). Selecting this app shortens the date but adds nothing after it, which gives it a nice minimalistic look, which I like.

Tip: Restart your iPhone if the blank widget is not available after installing and opening the app.Note that the widget is invisible, but still tappable. You may do this by mistake. It will open the widget app when you do so.

Nice little app that solves a problem of alignment of widgets on the Home Screen. Thank you!

you can add this app's transparent widgets to the lock screen. it also has widgets for the home screen, but they're not transparent. there's a small ad in the app where the instructions are.