Does Duda provide a learner site where we can try out features reserved for custom plans or require an upgrade
Duda will require you to upgrade. Generally, if your looking for a custom plan, you are already aware of the features and what your looking for. I do not believe they offer a trial period for this plan as their is so much back end dev work involved, but @ScottyStrehlow can answer that better than I can.
Great question. Right now this isn't offered publicly, but I can get you in touch with someone from our team and get a one-on-one call setup so you can learn more and get a walkthrough on some of the features you're interested in! Please send me a DM. 😊