Thread Count Fabrics
Low stock alert didnt work properly, lack of support to fix it. Which is too bad because the now in stock notification part of it was pretty decent. 4 stars for the now in stock notification, 1 star for the low stock alert and 1 star for support
Stitches And Stones Kc
It worked fine for a while, but I noticed that recently it stopped working. When the page first loads you can see the sign up form to receive an email on an out of stock item, but the sign up form vanishes almost instantly. This renders the app useless if people cannot sign up. I'm dropping this app. There is no point in spending $3 a month for something that does not work properly.
Little Black Diamond
App is functional, but doesn't handle variants very gracefully. Can't set quantity thresholds for firing emails (e.g. more than 1 should be restocked before it sends emails). Support is non-existent. Each of those issues is worth a star.
Asthmatic Kitty Records
Didn't work but needed something quickly. Form would appear on product page but then disappear.