Most DTC founders don't buy a BI tool because they want one. They buy it because they spent Sunday night manually pulling numbers from Shopify, Amazon Seller Central, and three ad platforms into a spreadsheet, and the math didn't match what the agency reported. That gap between "what the platforms say" and "what's actually happening to your margin" is the whole reason ecommerce business intelligence tools for DTC exist. This post is a checklist, not a ranked list of vendors. By the end you should know what to test before you sign anything.