I’m contemplating upgrading to a pro plan as I want to build a responsive web app. However, I want to be able to try out my basic app idea before commiting to paying for a pro plan (I am currently on a starter plan). Is there any way of previewing a responsive web app whilst I’m developing my app?
Hi @tomwilburwright7vu, welcome to Thunkable! 
The option to publish a responsive web app is available to Business or Team Level Users. A Pro plan allows you to have 2 mobile web apps published.
If you have any other questions for us, as you continue to use Thunkable, please just let us know.