Synder is an e-commerce accounting automation platform that connects Shopify, Amazon, Stripe, PayPal, Square, and 30-plus other sales channels with QuickBooks, Xero, and Sage to keep multi-channel sales books reconciled automatically. Branded as e-commerce accounting software for QuickBooks and Xero users, Synder combines per-transaction or summary sync modes, multi-currency support, automatic sales tax categorization, inventory tracking, and a built-in payment processor for invoicing clients. Synder is a strong fit for e-commerce founders selling across multiple platforms, bookkeepers and accounting firms onboarding e-commerce clients, and growing direct-to-consumer brands replacing manual end-of-month reconciliation with continuous automation.