Crassus handles invoicing, expenses, VAT reports, lease tracking, and document storage — everything you need to run a rental portfolio, nothing you don't.
For our launching customers, Crassus will be free forever.
Built for landlords who'd rather spend time on their portfolio, not their software.
Generate professional rent invoices automatically, track payment status, and handle credit notes.
Log maintenance, agency fees, and other property costs. Track what's paid and what's overdue.
Generate period VAT reports in seconds. Export to Excel or email directly to your accountant.
Track all agreements, get notified before leases expire, and never miss a renewal deadline.
Keep leases, receipts, insurance docs, and VAT exports in one place, organised by property.
Invite an accountant or property manager with scoped permissions — owners, editors, or viewers.
"I used to dread VAT quarter-ends. Now I click a button and send the Excel straight to my accountant. Genuinely saves me half a day every three months."
Marcus Verlinden
8 units across Antwerp & Ghent
"The lease expiry alerts alone are worth it. I nearly missed serving notice on a tenant last year. That won't happen again."
Sophie Hartmann
Landlord, 4 residential properties
"Finally a tool that doesn't assume I'm a Fortune 500 company. It does exactly what I need for my two flats and nothing more."
Tomás Reyes
2 properties, Barcelona