Professional app for issuing invoices, quotes and financial management for Canadian businesses. Freemium, Stripe, Google Play and cross-platform sync.

Drumblow Invoice

Complete billing and financial management solution built for the Canadian market, with subscription support, in-app purchases and compliance.

Stack

Cross-platform: Flutter (Android, iOS, Web, potential desktop)
Backend: Rust (Axum + SQLx)
Payments & Subs: Stripe + Google Play Billing
Features: Freemium / Trial, magic links, rate limiting, monotonic invoice counters, jobs/clients, printing

Quality Highlights

Complete pentest (125 tests) + security audit with 21 vulnerabilities handled
Play Store listing, privacy policy and data safety declaration ready
Migrations including trial, freemium, refresh tokens and plan changes
Layouts designed for desktop and mobile

Live: invoice.drumblow.com

Drumblow Invoice

Drumblow Invoice

Stack

Quality Highlights

Metrics

Screenshots and real project prints