Crater / InvoiceShelf

Crater is an open-source invoicing and expense application that helps freelancers and small businesses create invoices and estimates, track expenses, record payments, and manage clients, serving as an alternative to FreshBooks. It produces clean, professional invoices and estimates, supports recurring invoices, multiple currencies, and tax rates, and gives a clear view of what has been billed, paid, and is outstanding. A mobile app complements the web dashboard for on-the-go billing.

StoresWiki LLC provides Crater as a managed, privately hosted service. We deploy a secured instance, keep it patched and updated, monitor it, and run regular backups of your financial records, so your billing history is safe and always available. Your invoices, client list, and financial data stay on infrastructure you own, with no per-seat SaaS fees and no risk of losing access behind a paywall.

It suits freelancers, consultants, and small businesses that want straightforward, professional invoicing with complete ownership of their financial data and a predictable hosting cost rather than a recurring subscription.