Create professional invoices, track payments, send reminders, manage expenses and projects, and know where your business stands — all from your phone.
Running a small business is complicated enough. 3S Invoice gives you the tools you actually need, without making you learn accounting software first.
It is deliberately simpler than an accounting system. It answers the questions a business owner actually asks — and leaves the chart of accounts to your accountant.
Then move on with your work.
The free version is not a demo. It is the whole invoicing workflow, with no limit on customers or invoices.
The money that slips away is rarely the big invoice. It is the small one nobody followed up on. 3S Invoice keeps it in front of you.
Pro adds quotations, expenses, projects and the reports that tell you whether the business is actually making money.
Connect invoices and expenses to a project and see how much was quoted, invoiced, collected, spent and earned.
Profit and cash are not the same thing, and 3S Invoice does not pretend they are. A project can be profitable while half its money is still in your customer’s pocket — you see both.
Your business shouldn’t stop because your connection did. No permanent Internet connection is required for everyday use.
No monthly subscription. The free version does the invoicing; Pro adds the business tools.
The complete invoicing workflow, with no limit on customers or invoices.
Quotations, expenses, projects and the reports that show what you actually earned.
$75 one-time purchase for 3S Invoice Pro. No monthly subscription required for the core Pro application. Prices in USD.
Yes. The free version has unlimited customers and unlimited invoices, along with payments, reminders, PDFs and A4 printing. It is not a trial and it does not expire.
3S Invoice Pro is a $75 one-time purchase.
No. No monthly subscription is required for the core 3S Invoice Pro application.
3S Invoice is in development for Android and iPhone. Get in touch and we will let you know when it reaches the stores.
Yes. Everyday invoicing and business management are designed to work without an Internet connection.
On your phone. 3S Invoice is offline-first and keeps its business data locally on the device. Backup and restore work with a local backup you create.
Yes. Generate the invoice PDF and share it through WhatsApp or any other app on your phone.
Yes. Arabic is fully supported with right-to-left layouts, alongside English and French. The app language and the language of your invoices can be different.
Tax is configurable: call it VAT, GST, Sales Tax or simply Tax, set your rate, or work without tax. 3S Invoice does not claim statutory compliance for every country, so check what your local rules require.
Yes, with Pro. 3S Invoice prints to common 58 mm and 80 mm thermal receipt printers. Every version, including Free, prints A4 through your phone’s normal print function.
Yes, in Pro. An accepted quotation converts directly into an invoice.
Yes, in Pro. Expenses have categories and can be linked to projects, and each project shows its invoices, collections, outstanding balance, expenses and profit.
No. 3S Invoice is a simple invoicing and business-management tool. It does not try to replace full accounting software or a professional accountant.
3S Invoice is coming to Android and iPhone. Drop us a line and we'll tell you when it's in the stores. No spam, just the launch.
Get notified at launch →