I have a paid Airtable account and have worked extensively with it. It is a great tool with lots of flexibility, but I had some concerns: the lack of API connections, and the price range ($20/month per user for the Pro plan). Stackby does almost everthing Airtable does, adds API integration, and this deal includes several users from the start, which is great.
My main concern with this deal is the limitation in rows per stack. Stacking a max. of 5 codes gives you 30.000 rows per stack, which can be a problem with data - intensive projects. In comparison, the Pro plan in Airtable gives 50.000 rows. I am surprised that Stackby has not matched their competitor with this number in this deal, and I would love them to go up to 50.000 rows in this offer.
Otherwise, it seems like a very promising tool, no regrets so far. Keep up the good work!