There's also deformity.ai for a much cheaper/freemium version. I can tell you how Deformity is useful:
- You can type logic in plain English (no more complex logic trees)
- AI controls the conversation, meaning it can dive deeper and ask clarifying questions beyond a traditional form
- It speaks 120 languages, meaning you need to do nothing to collect data from a global audience
- You can choose between AI forms or static forms, so you can use AI for cases where you need or want and not otherwise
- Beyond that, AI can reference other information to answer questions (such as data from your website or files). So it can do more than traditional forms can