Create professional invoices in seconds. No account, no signup, no bloat. Download as PDF instantly. Subscribe to save invoices, send by email, manage clients and set business profile defaults. Built lean on purpose: 5 dependencies, vanilla JS, no build step. Just invoicing that works.

Most webhook and event systems fail quietly — duplicates, drift, silent retries, and broken assumptions. Duerelay adds deterministic control to revenue-critical workflows. Every event is scoped, idempotent, and enforced with visible proof. Instead of hoping your system behaves correctly, you can verify that it did.