A: 1. This does not seem an alternative to bubble since it deals mainly with the backend. What about the front-end?
— DIrectual web-page builder is great for internal apps and admin portals. If you need something sophisticated have a look at Quarkly.io or traditional development on ReactJS or Angular

2. What integration do you have with webflow (you mention somewhere webflow)
— Directual can be connected with webflow using HTTP-request step; Plugin to Webflow in in the nearest roadmap

3. This is a developer license without an operation app. Once the app is ready, I get a 30% discount. I can get more on Black Friday.
— OK

4. I would like to create an app for stock market investors. First, they would define a portfolio; then, data would be pulled out from Google Sheets or Airtable. Finally, data would have to be available on tables and charts. Is this possible without any code?
— Charts ware in the roadmap, it will be available by September. All the other needs are met. Without coding.

5. Can I embed data (Goole studio, video, javascript, chat widget) in the app?
— Yes, you can use iframe (embeds)

6. Integration with FIGMA
— No

7. Integration with Integrately
— No, but I guess it can be connected via regular HTTP-request.