Billdu lets you know when an invoice has been sent, viewed or paid, or when an estimate/quote has been accepted.

Billdu can send you a notification about such event, take a look here to learn more about notifications.


In the column Status you can see whether your invoice has been already sent or if it has been viewed by your client.


The timeline displays the most critical events on a document. You will find a complete event list on Billdu website when you Preview a document and scroll down. The timeline display essential events such as:

  • creation date

  • date when a payment was added/removed

  • date when the invoice got overdue and estimate not valid

  • when and to whom an email has been sent and when it was opened

  • which document was created from the current document


When you send a document the status changes to Sent.

Once Billdu recognizes that it has been opened, the status changes to Viewed.

You can see the exact date & time when a document has been sent or opened as well. Edit the document - you'll find it beneath the Total due field.

How it works and some limitations

  • The status changes to Send when you email it using the Send button

  • The status changes to Viewed when your customer opens an email (only on Billdu website and iOS apps where we use tracking pixel on emails) or clicked on the link

  • The status won't change to Send when you share or print a document

  • The status won't change to Viewed when your client opens a PDF file that you've downloaded

  • The status doesn't change when you print an invoice

  • On iOS devices the status won't change to Viewed, when you send a document using your own email app and the customer's email blocks tracking pixels

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