FeeFlow is an ad-free, 0-lag payment fee engine for freelancers, merchants, and SaaS founders. Calculate exact 2026 fees for Stripe, PayPal, Square, Braintree, and Wise across 46 countries. Features reverse gross-up math (so you net 100% of your invoice), domestic vs cross-border interchange, micropayments, and client-ready payout breakdowns. Open-source, privacy-first, and ultra-fast.
