Can I create private widgets, that only my account can use?

Is it possible to create a widget and use it without registering and making it public to everyone?

If the widget is added to the Widgets Gallery Page then it will be available to the public.

You can create a widget and use it in the Form's Source Code if you don't need it in the form builder.

How to get the Full Source Code of your Form

I have also forwarded this to the Widgets team and we will let you know if it is possible to make the widget available for your account only.

Hello Max,

Additionally... 

If you create an iframe widget here: https://developers.jotform.com/widgets/new , it will be available to you from your JotForm account as one of the widgets on the form builder.  

No need for approval as long as you use it for yourself.