Stitch Labs

Stitch Labs has truly become the foundation of our busines and I wholeheartedly recommend it for any shop selling through multiple channels.
We rely on Stitch to keep three channels up to date with available inventory: our retail Shopify storefront, our reseller Shopify storefront, and Amazon. We initially went with Stitch so our two Shopify stores could share inventory. We had previously tried some of the variant-based app workarounds for wholesaling on Shopify, and while valiant efforts, they call came up short, namely because they "broke" integrating with other apps unaware of the unconventional use of variants (like FB publishing apps). Other stand-alone Stitch competitors were also not an option either because they could only handle one Shopify store, not multiple.
Amazon integration was a real bonus, as we previously abandoned selling on Amazon due to the administrative burden of constantly updating inventory on Amazon. We also sell through an additional, less common, marketplace not supported by Stitch. No problem. Stitch lets us effortlessly enter the orders through its web portal. Within minutes our three other online channels are updated to reflect the proper inventory levels.
We began with Stitch about a year ago. It was fine then and it just keeps getting better. For starters, we love the new UI – clean, consistent, and informative. The recent speed boost and other tweaks make it a pleasure to use. We are also thrilled with the new BETA bundling feature. Some complain about Shopify lacking this or that function. However, some of that is by design. Bundling is one such feature – I do not want it in Shopify because we have multiple channels.

Bottom line: Stitch Labs saves us time, saves us money, saves our sanity, and allows us to smoothly manage our business in the multi-channel world that is modern e-commerce.

We are grandfathered in from early stitchlabs pricing so we don't pay the $499 monthly price. Given that I miss out on upgrades as stitchlabs tries to phase out my $75/mo plan and force me to switch over. I use it with Shopify, Shipstation, Xero, Amazon, Paypal and Stipe.

Eventually I will but not yet and here's the Pros and Cons why:

Our business has been around for 30 years, and until we made the switch to Stitch Labs, we have been using Excel spreadsheets to manage our inventory. This meant having to manually add/subtract inventory, having no clear reporting, and just a jumbled mess of data (since columns were added whenever they were needed, and not always used for what they were meant for). We decided we needed to make a change to a better system that would allow us to spend less time doing the tedious work of managing the inventory (which was inevitably wrong), and more time running our business. We are a fishing tackle business that has 1,000's of products/variants and Stitch Labs made it a breeze to add products to their system by building the lists in Excel, which we are used to, and then importing the data to their system in bulk. Their support is also impeccable, we were a little shy about making a commitment to a monthly payment for our inventory system, but from day one, the "Master Stitchers" have been there when we needed them , even when we don't. I love the fact that they proactively call their clients and check up on them and see if there is anything they are stuck with or having issues with. That's a big plus with us versus companies that are willing to take your money, and then never followup with you.

We use this all day every day. It gives us unlimited custom fields, brings in orders, reminds us to reorder, allows intracompany transfers, and new features are constantly being added.