Build an Invoicing App in 21 Days
Quotes, invoices, payments, reminders — the app freelancers and SMBs actually pay for.
Why Invoicing & Billing App development is hard to get right
Freelancers and SMBs pay $15–$50/mo for invoicing tools — a focused niche app can capture that market fast
PDF generation, tax rules, and multi-currency are underestimated — most MVPs ship without proper compliance
Payment collection (Stripe, bank transfer tracking) and overdue reminders are the features that drive retention
French/EU founders need TVA, SIRET fields, and legal invoice numbering — generic US templates fail
What we build — in detail
Client & contact management
Client profiles, billing addresses, payment terms, notes, and invoice history per client.
Quotes & invoices
Line items, tax/VAT rates, discounts, custom numbering, PDF export, email send, quote-to-invoice conversion.
Payment collection
Stripe payment links on invoices, partial payments, payment status tracking, bank transfer marking.
Automated reminders
Overdue invoice reminders via email (Resend/SendGrid). Configurable reminder schedule (7, 14, 30 days).
Expense tracking (optional)
Receipt upload, category tagging, profit/loss summary per month. OCR receipt parsing in v2.
Client portal
Clients view and pay invoices online without logging into your full app. Branded portal URL.
Dashboard & reports
Outstanding balance, paid this month, revenue chart, top clients, export CSV for accountant.
Tech Stack
- →Next.js
- →React Native (optional mobile)
- →Supabase
- →Stripe
- →React-PDF / Puppeteer
- →Resend
- →Vercel
What you get
- Web app
- Mobile app (optional)
- PDF invoice templates
- Admin dashboard
- Full source code
Frequently asked questions
Do you handle French/EU invoice compliance?
We add TVA fields, legal mentions, sequential invoice numbering, and SIRET/company info blocks. Full e-invoicing (Factur-X, Chorus Pro) is a v2 integration scoped separately.
Can clients pay directly from the invoice?
Yes — each invoice gets a Stripe payment link. Clients pay by card; you get notified and the invoice marks as paid automatically.
Free Invoicing & Billing App resources
Download these before you start — no credit card, just your email.
Planning your build?
Invoicing & Billing App development — USA, UK & Canada
Fixed-price MVPs for founders in these cities. Same team, same 21-day delivery — remote-first with timezone overlap.
Invoicing & Billing App in Austin
USA · CST (UTC-6)
Invoicing & Billing App in Birmingham
UK · GMT (UTC+0)
Invoicing & Billing App in Boston
USA · EST (UTC-5)
Invoicing & Billing App in Calgary
Canada · MST (UTC-7)
Invoicing & Billing App in Cambridge
UK · GMT (UTC+0)
Invoicing & Billing App in Charlotte
USA · EST (UTC-5)
Invoicing & Billing App in Chicago
USA · CST (UTC-6)
Invoicing & Billing App in Dallas
USA · CST (UTC-6)
Related app types
Ready to build your invoicing & billing app?
Book a free 30-minute scoping call. We'll map out exactly what v1 looks like, give you a fixed price, and start within a week.
Book a Free Scoping Call →Free · No commitment · Delivered in 3–4 weeks