SlimFactStreamlined invoicing made easy

Create, send, and get paid — without the hassle

Invoices, Bills & Receipts

One system for everything. Create professional invoices, send bills, and issue receipts — all with a consistent, polished look.

How it works

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Online Payments

Accept iDEAL, credit cards, and more through Mollie or Stripe. Your customers pay with a click, you get notified automatically.

Payment options

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Client Portal

Your customers get their own dashboard. They see all their invoices, bills and receipts in one place — no more chasing paperwork.

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Subscription Billing

Set up recurring invoices with cron schedules. Weekly, monthly, quarterly — SlimFact handles it while you sleep.

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Multi-Company Support

Run multiple companies from one account. Each gets its own branding, banking details, and invoice numbering.

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Email Delivery

Send invoices by email with customizable templates. Open tracking tells you when a customer reads your invoice.

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Export Any Format

PDFs rendered with Typst for pixel-perfect typography. UBL and Peppol XML for e-invoicing. EPC QR codes for bank transfers. Even CSV exports.

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Headless API

SlimFact is API-first. Integrate invoicing into your own applications, automate your workflow, or build custom frontends — the tRPC API has you covered.

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OpenID Connect

Federated single sign-on with any OIDC provider. No separate passwords to manage — your existing identity provider handles authentication.

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Multi-Language

English, Dutch, and German UI out of the box. Set the locale per invoice for your international customers.

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Built for Speed

Database-backed with on-the-fly PDF generation. No file system clutter, just fast queries and instant rendering.

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Beautiful Templates

Invoice templates are written in Typst — a modern typesetting system. Clean layouts, perfect math, and no more misaligned tables.

About Typst