apps.shopify.com/low-stock-noti…
I set up a Slack integration to tell me inventory level every Monday so that I can make reorders for low stock items accordingly

apps.shopify.com/helpcenter?utm…
User-friendly FAQ help page
Helps reduce customer inquiries if you have a well-made FAQ page

apps.shopify.com/okendo-reviews…
Detailed customer review app that will survey customers for questions related to them in relation to your product
(Customer skin type, years of experience in makeup, etc) if you're doing a makeup product
apps.shopify.com/returnmagic?ut…
Helps make the return process seamless and increase customer happiness -- even if they return your product today, there's still a chance they'll come back again if they had a good overall experience and want to try another product
apps.shopify.com/customer-back-…
If your item is out of stock, this app sets up a notification for the customer so they'll get an email/text when it's back in stock
apps.shopify.com/free-shipping-…
Increases basket size by incentivizing customers to buy more to redeem free shipping

apps.shopify.com/smile-io?utm_c…
Super well-built reward program that's easy to set up. It'll increase customer loyalty and allow you to reward customers for making more and more purchases

apps.shopify.com/stocky?utm_cam…
Easy to use inventory management system that will help you calculate how many units of a product you need to buy based on historical sales data
It's f r e e

apps.shopify.com/taxjar?utm_cam…
If you're selling in the US, you must pay sales tax on the orders that are made in the same state and county you're in (state and county tax) I used to do this manually for years, but taxjar does it all automatically
apps.shopify.com/tracktor-2?utm…
Order tracking app for your customers to track their orders within your Shopify site
It'll reduce a bunch of customer inquiries like "where tf is my order"

apps.shopify.com/lifetimely-lif…
This is a new app but one of my fave. It'll do everything that OrderMetrics is doing but at a fraction of the cost. It'll also tell you your CLTV, how frequently do people buy again, and other metrics for your marketing needs

Hope this has been helpful
Enquire Post-Purchase Survey is my secret weapon
apps.shopify.com/enquire?utm_ca…
Asks your customer on where they heard from you, which usually is different than the referral source that Shopify tells you :) helps if you do influencer marketing a lot
Cheaper rates + better UX so our team was able to sync in asap
Founders and support team were incredibly helpful as well