QuickBilling
QuickBilling — Invoicing, Estimates & Expense Tracking
Solo-built SaaS to send invoices and quotes in minutes, track opens, manage expenses, and share secure client links — with a public OpenAPI.
Timeline
2024 – Present
Stack size
8 technologies
Role
Solo Founder / Engineer
Company
Independent product
Overview
Overview
QuickBilling is my independent billing product: independents and small teams create professional invoices and estimates (quotes), generate PDFs, and use secure share links so clients can view or accept without friction.
- The product also includes expense tracking (costs), quote-to-invoice conversion, link analytics (know when a proposal was opened), team workspaces, and a documented REST API (OpenAPI). Subscriptions and billing flows integrate with Stripe; the stack is Supabase-backed Postgres with strict tenant boundaries and automation-friendly webhooks.
- Public surfaces: marketing at quickbilling.io, application at app.quickbilling.io, user docs and API reference at quickbilling.io/docs — aligned with the same product narrative I ship in code.
Problem
Problem
Generic tools are either accountant-heavy or too shallow for real client workflows. QuickBilling targets the middle: fast professional documents, honest expense visibility next to receivables, and shareable links with analytics — without pretending to be a full general ledger.
Architecture
Architecture
Frontend
Backend & data
Payments
Platform
Infra
Features
Features
- Invoices and estimates with line items, taxes, discounts, and brandable templates.
- Secure share links and PDF export; quote-to-invoice conversion.
- Link and open tracking for client-facing documents.
- Expense tracking (costs) alongside receivables.
- Team workspaces for multi-user orgs.
- REST API with OpenAPI spec for integrations and automation.
- Email notifications, receipts, and reminder-oriented workflows.
AI systems
AI systems
- Optional assistive flows for invoice/reminder copy and UX microcopy experimentation (where they improve time-to-send without bloating core accounting).
Outcomes
Outcomes
- Live product from zero → production with marketing, app, docs, and API surfaces.
- Positioned for freelancers and small businesses: fast send, professional presentation, expenses + invoicing in one workspace.
- Shipped with operational discipline: staging/production parity, documented API, and cost-aware SaaS patterns (Stripe, Supabase).
Technologies
Technologies
FAQ
FAQ
Who is QuickBilling for?
Freelancers, consultants, and small businesses that need invoices and estimates quickly, want expense tracking beside receivables, and value share links with basic analytics — without full ERP complexity.
Where are the app, API, and documentation?
Marketing: quickbilling.io. Product: app.quickbilling.io. Help and API docs: quickbilling.io/docs with an interactive OpenAPI reference for the public REST API.
Does QuickBilling include expense tracking?
Yes. Expenses (costs) are a first-class module alongside invoicing so independents can see money out and money in in one workspace, not only receivables.
More work