Stacker is on my shortlist of no code services to try once I've finished scaffolding in Airtable. Others are Bubble (https://bubble.io), Boundless (https://www.boundlesslabs.com) and Webflow (https://webflow.com/).
Stacker looks nice, but why is it better than the other options that have been around for a long time? At $349/app/mo (or $3480/app/yr) it seems more expensive than the others but perhaps the value is there.