Show HN: Silli – Change your friends phones background image

silli.co

1 pointchattie3 comments

In this one they're both possessive... so to avoid looking unprofessional it would be:

friends' phones' background images

And on the web site, photos is not possessive, so it would be spelled: photos

Ahh that's embarrassing, my grammar is (obviously) not my strong suit. Thank you for correcting me!

You need to change let's to lets as well.