SlimFact is an invoicing platform designed to simplify the process of creating, sending, and managing invoices, bills, and receipts. It provides a unified system for handling professional billing documents, offering a consistent and polished appearance across all outputs. The platform supports online payments through integrations with Mollie and Stripe, enabling customers to pay invoices with a single click and automatically notifying users upon payment.
A notable feature of SlimFact is its client portal, which gives customers a dedicated dashboard to access all their invoices, bills, and receipts in one place. Subscription billing is also supported, allowing users to automate recurring invoices on schedules such as weekly, monthly, or quarterly. For businesses operating multiple entities, SlimFact enables management of several companies from a single account, each with distinct branding, banking details, and invoice numbering.
The platform includes tools for email delivery of invoices, with customizable templates and open tracking to confirm when recipients read their messages. Export options are extensive, including PDF generation with Typst for high-quality typography, UBL and Peppol XML formats for e-invoicing, EPC QR codes for bank transfers, and CSV exports. SlimFact is built with an API-first approach, offering a tRPC-based headless API for integration into custom applications and workflow automation. Authentication is handled via OpenID Connect, supporting federated single sign-on with any compatible provider.
SlimFact offers a multilingual interface, with English, Dutch, and German available, and allows users to set the locale per invoice to accommodate international clients. The system is database-backed for fast queries and generates PDFs on the fly, avoiding file system clutter. Invoice templates are crafted in Typst, ensuring clean layouts and precise formatting. The platform is distributed under the ELv2 License and is developed by simsustech.
SlimFact sits in PulseGate's Finance & accounting category. It focuses on simplifying the process of creating, managing, and sending invoices and receipts for businesses and freelancers. It is built as a B2B product for small business owners. SlimFact is available on the web.
SlimFact first shipped in 2024. Development happens publicly on GitHub with 30 commits in the last 90 days. Key capabilities include invoice creation, online payments, and client portal.
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