BusinessOS is private, offline accounting software for small business and freelancers. Invoicing, expenses, cash flow, reports. Works fully offline — not "syncs later," actually works with no internet. Encrypted on your device. Loads in under one second.
Most accounting software stops working the moment your internet drops. BusinessOS doesn't — it's true offline accounting software, not cloud accounting with a spotty offline mode. Every feature — invoicing, expense tracking, cash flow forecasting, financial reports — runs entirely on your device, online or not. If you've searched for "accounting software not online," "best free offline accounting software for small business," or "cloud vs offline accounting systems," this is built for exactly that.
BusinessOS has a one-tap "send invoice via WhatsApp" button on every invoice — the tool that lets you send invoices through WhatsApp directly, with a pre-written message, invoice details, and payment info attached. No separate app, no copy-paste.
Everything a small business needs. Nothing that gets in your way.
End-to-end encrypted on your device. Nobody can read your books — not even us.
Full features, wifi off. Not "syncs later." Really works.
Say the customer, amount, and description. Invoice ready in 3 seconds.
One tap sends the invoice with details, bank info, and a pre-written message.
No signup. Runs in your browser. Copies the answer to your clipboard.
BusinessOS includes free tools for automated invoicing for B2B ecommerce, automatic tax code assignment on invoices, VAT and GST calculators, freelance rate calculators, SaaS metrics (MRR, ARR, churn, LTV, CAC), and more — all built into BusinessOS, all free during limited early access.
No credit card. No trial timer. No invoice limits. Free during limited early access.
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