The ability to create and send estimates are available to all Invoiced users as an addon that is turned off by default. In order to start using estimates you just need to turn it on!
Steps to enable estimates:
1. Sign in to the web app at invoiced.com.
2. Go to the Settings section in the left sidebar of the app.
3. Click on General in the Invoicing Settings section.
4. Click the switch next to Estimates Addon to enable the estimates feature. A new Estimates tab should be appear in the left sidebar.