What We Do

Generate invoices, manage customers, edit items and more. otInvoice is your better choices to make professional invoices.

Download (ver 1.1)
invoicing solution
Why otInvoice


otInvoice is a Microsoft Windows desktop software that helps you generate and manage small business invoicing. It can:

  • Easy to generate and manage professional invoices
  • Create and manage customers, items, stores and taxes.
  • Automatic saving items from retyping information.
  • Support multiple stores and tax types.
  • Apply taxes to specific item.
  • Print invoices with live preview before print.


  • All
  • Invoice
  • Customer
  • Item

Invoice List

Print Customer List

Search Item

Create Customer

Item List

Print Invoice

Customer List

Generate Invoice

Create Item

Download otInvoice

Download the free trial version of otInvoice and try it now. You can free trial it for 5 days. If you still want to use it, you need to buy a license.

OS: Windows 7/8/10, Windows Server 2012/1016/2019

Released: April 5, 2020



Annual Subscription

$19 .99

  • Unlimited for 1 year
  • Email support
  • Automatic updates
  • Included source code

Source Code

$999 .99

  • Lifetime
  • Email support
  • Automatic updates
  • Included source code

Frequently Asked Questions

  • You need to buy the license first. And we will send register code to your email account (the one you fill in when you bought the license). After you receive the register code, enter it in the otInvoice register window. If you already bought the license but didn't receive your register code, please contact us to make sure what went wrong.

  • otInvoice will auto update to latest version after you buy the license and register, so you don't need to worry about when and how to update otInvoice. But otInvoice can only update when your computer connect to Internet.

  • The currency symbol in otInvoice decided by your system culture info. You can view Microsoft official document to learn how to change it. You need to change your regional settings to match the regional currency symbol, like the currency symbol in America is $.
  • Open your editable invoice (you can't edit the archived invoices) in otInvoice and there should be some text boxes, combo boxes and buttons on the top, count from left side, the third one can select template. The default template is "Simple - Gray", you can choose another template in the drop down list. Each template has a image to let you know what they look like. If you don't like any template in the drop down list, you can click the last button in the drop down list, "View More", and it will send you into another page that you can view all of our templates. Select the one you most like and click "Ok" button, then your invoice will change into that template.

  • Open your invoice in otInvoice and click the little arrow which on the right side of the "Print" button. Then wait for a file dialog, you can choose your file loction and edit file name in the file dialog. Click "Save" button to save the PDF file.

Contact Us


80 Ross St W, Moose Jaw, SK S6H 2M3, Canada


+1 (306) 972-7888

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