There are a number of things to look for in competitor research tools: in this instance a Shopify Research Tool.
Before starting, let’s remind ourselves that Shopify is an eCommerce platform that has everything needed for a business to sell online.
It can be really handy to understand what your competitors using Shopify may be up to, and this is where a Shopify Research Tool comes in very handy. Things like where a competitors traffic comes from (useful to know if there is one particular location that they are selling to, that you are not), how many searches they are generating per week/per month, compare multiple competitors side by side to find if there are any gaps in the offers that they are selling.
There are quite a few tools which have a no pay level of subscription. You will find that these give you enough to get by but are really supposed to give you a taster of what you could achieve if you went for a paid plan.
Whatever you choose to go for, good luck!