Invoicing software for modern business
The base of all your invoicing.
Professional invoices in seconds — on your computer, on your phone, or through the API.
Free plan · No card required · Cancel anytime
Today
01 / Features
Everything your billing needs.
Nothing it doesn't.
Built for small businesses
Invoices in seconds
Professional invoices, receipts and quotes, created and sent in a few clicks — on your computer or your phone.
Compliant wherever you are
Country-aware tax rules out of the box — including government-certified invoicing for Portugal. Every document goes out valid.
Payments under control
Record payments, send receipts and always know who owes you what — without spreadsheets.
Your accountant in the loop
Monthly exports your accountant can work with, delivered automatically by email. Month-end without the back and forth.
Recurring billing on autopilot
Subscriptions and retainers invoiced and emailed every month, with no manual work.
Several companies, one account
Manage all your companies in one place, with fully separated data and one-click switching.
02 / How it works
Three steps to your first invoice.
Create your account
Sign up in a minute, no credit card needed.
Add customers and items
Import them or create them from scratch.
Issue
Send your first invoice and get paid — taxes and compliance handled automatically.
03 / For developers
The base of your platform.
Building an app or a platform? Invoice through our API: your application sends the data, we take care of compliant documents and delivery.
- →Sandbox environment included, with no real fiscal documents
- →Interactive documentation with ready-to-use examples
- →Built for platforms: each customer gets its own company
- →Support from the team that builds the product
$ curl -X POST api.billingbase.net/v1/documents
-H "Authorization: Bearer sk_live_••••"
-d '{"type":"FT","customer_id":"cus_9f2","lines":[…]}'
201 Created
{
"number": "FT A/2026/0044",
"atcud": "AAJF45F0-0044",
"hash": "Kx7fA…mQ2="
}
04 / Pricing
Simple pricing, no surprises.
No credit card required
Start with the base.
Issue your first invoice in under five minutes.