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 — buy it once, or pay yearly.
The complete invoicing workflow, with no limit on customers or invoices.
or $30 a year — $2.50 a month, billed annually
Quotations, expenses, projects and the reports that show what you actually earned.
3S Invoice Pro is a $99 lifetime licence, paid once, or $30 a year ($2.50 a month, billed annually). No monthly subscription. 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 comes two ways: a $99 lifetime licence, paid once, or $30 a year, which works out to $2.50 a month billed annually. If you don’t renew the yearly plan, the app goes back to the free version.
No. Pro is either a $99 lifetime licence or a $30 annual plan. Nothing is billed monthly, and the free version costs nothing at all.
3S Invoice is on Google Play for Android now. The iPhone version is coming to the App Store soon.
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 free on Google Play, with no cap on customers or invoices. The iPhone version is coming to the App Store soon.
Get it on Google Play →