Shopify App Detector by Shopify Spy

De*****

Useful, you need it when you're looking for inspiration on other sites so you'll see exactly what apps and themes are they using. FREE!

This is great. I forgot about it until recently. It helped me with researching competitor apps.

Ci*****

This is just the best extention for a freelancer and a Shopify developer. I've been searching for something like this and I finally find it.The best ever.