Hello @felipe , yes you will need to purchase a license to ‘publish’ the bot on a website for public use. As of now, you will need to reach out to info@kore.com for the same. We also hope to come up with retail plans in some time for our diverse users.
However, if you want to play around with a bot you created on botbuilder and integrate the same on a web-page on your dev server etc. you may use this link to know how to do it.
https://test-discourse.kore.ai/t/facing-issue-while-integrating-bot-with-web-mobile-client-channel/521/16
Hope this helps!