Hi Amanda, I wish we could have a look at an example of sites you want to build to get a concrete idea of how to advise you best, but based on my knowledge of Memberstack and Webflow, YES,
It’s definitely possible to create custom online course sites with membership, progress, quizzes and fun interactions on Webflow using Memberstack plus additional integrations.
Membership
Memberstack allows you to offer free or paid access to digital courses, and gives you full access to your member data so you can work your sales funnel with other tools
https://www.memberstack.com/for/education
Funnels and Email Campaigns
Using Memberstack you can create free membership plans to generate leads, and because you’re using Webflow which comes with excellent Zapier integrations, you can run automated email campaigns as actions happen on your Webflow site, e.g a user signs up, with any of the many email marketing integrations that work on Zapier.
Quizzes + interactions
Quizzes will require third party integrations.
Master the Handpan is an example of a custom course site entirely built on Webflow which integrates Tryinteract quizzes using Webflow’s embed feature.
To achieve a sense of progress after a student successfully passes a quiz, the success button of each quiz can point to the next item in the custom course.
But there are other options for integrating quizzes which Webflow lists on their integrations page
Customisation + Templates + CMS
Plus if you’ve come to Webflow it’s likely because you need full customisation of your course site, which won’t be as easy to get with Wordpress or Katra templates.
The Webflow’s designer allows for full customisation of your course site and makes it easy to add fun interactions. And if you still want templates flowbase has you covered.
While the Webflow CMS allows you to host all your course content on Webflow.
I’d definitely suggest utilizing the CMS template pages to power your course pages.
Inspiration
Checkout Webflow’s case study of building a course in Webflow https://webflow.com/blog/building-a-course-in-webflow
Also checkout this showcase of a course site that’s powered using Memberstack Memberstack – Showcase - Leonardo English