Forms

1. typeform.com

free version - dont have calculation

But friendly and easy

2. https://www.cognitoforms.com

free

but unfriendly design

3. Chatbots

https://surveybot.io/chatbots/lead-generation

facebook messenger

any calculations

3.1 https://chatfuel.com/

3.2 https://landbot.io/ph/index.html?ref=producthunt

>>>

And we can use https://outgrow.co/

But its not free