Spreadsheets work fine when you're selling on one channel. They stop working the moment you add a second sales channel, a third ad platform, and a GA4 funnel nobody fully trusts. That's the point where most DTC teams start searching for real ecommerce analytics software, and it's also where this guide picks up: nine tools brands are actually using in 2025 to pull Amazon, Shopify, and ad data into one place instead of six browser tabs.