Neurochrome

Easy to install even on a customized theme. It seems to work as described and integrated seamlessly with my store theme. The free plan is useful for those of us with smaller/niche stores (thanks!) Just make sure to go through all the settings and adjust to your liking. Note, specifically, that the app defaults to sending out four (4) reminders when a product is back in stock, which I found too aggressive. It's easy to change, though.

I ship some products, that are flat and can go in a bubble mailer, and others which need to ship in a box. Boxes are heavier than bubble mailers, so I need an app with a little bit of intelligence to get accurate shipping rates, or I will lose money on boxed orders. I have used other apps, and while they do work, the ones I tried did not all integrate well with Shopify, so I had to copy-n-paste all the shipping information onto the carrier's website, which was a hassle. Those apps were also pretty expensive. ClickShip is free (yes! really!) and integrates smoothly with Shopify and FreightCom (the shipping backend). It automatically imports your products, so all you have to do is to set up the product dimensions (hint: export the product list from ClickShip, edit the Excel sheet, import) and set up your box dimensions. Do note that ClickShip requires support for third party shipping rate apps/providers enabled with Shopify. If you pay annually (or longer terms), this is included for free. All you have to do is to write Shopify Support to have it enabled. If you're on a monthly plan, you may be able to get this feature for an additional fee (ask Shopify!). With this app I can now offer my customers discounted rates for FedEx, UPS, DHL, and others. I have ~40 products and it took me maybe 2-3 hours to get everything running to my satisfaction. Their customer support is there for you should you need help (someone responded to my chat within a few minutes). I have my stores set up to serve Canada Post rates directly from Canada Post (I have a commercial account with them) and FedEx/UPS rates via ClickShip. It works for me. I think ClickShip/FreightCom could support metric dimensions and weights better. Metric dimensions are supported, but the system defaults to US units, so a few extra clicks are needed for the conversion in the shipping process. It's not a big deal. Just a small annoyance that could easily be solved in software. I shipped my first UPS package this morning. I think it took, maybe, 3-4 mouse clicks from login to shipping label. And the actual price charged was the rate quoted to my customer. I like it!

Amazing app support! Due to a bug in my theme, the app code was executed twice for each shipping calculation. Dave was amazingly patient and helpful dealing with the theme developer in fixing the bug. All is working well now. The app is easy to set up. Type in the API credentials for your shipping services, set up box sizes, add product dimensions, and off you go. I have about 40 products in my store and was able to get it going in an evening. If I was to nitpick, I would say that the app could work a bit better with the latest version of Safari (OSX 10.15.3; Safari 13.0.5), but then so could Shopify in general. The bottom line is this: I've already saved more than the monthly cost of the app by having the shipping charges calculated correctly.