Yes, sadly, On2Air Forms has been discontinued.
Some fantastic replacements:
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Fillout is currently the most advanced form tool that communicates in real time with Airtable, and it goes way beyond Airtable’s form capabilities. It supports all the features that all of us have wished Airtable’s forms had. For example, features like creating new linked records in a form, having nested linked records many levels deep (i.e. linked records through many tables), dynamic conditional filtering, and much more. It’s pretty incredible.
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Noloco is currently the most powerful portal tool & interface builder tool that works natively with Airtable. It is so incredibly rich & complex, and it supports all of Airtable’s field types. It goes way beyond Airtable’s interfaces. I gave a demonstration of Noloco on this episode of the BuiltOnAir podcast.
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For forms that are super-advanced but don’t communicate natively with Airtable (i.e. they require a tool like Make to communicate with Airtable), I also love JotForm and Cognito Forms.