What do you mean by "free for development"?
Your TalkJS account comes with two TalkJS apps: One for development and testing, and one for production. The development app has no limits and is free forever, so you can take the time you need to tune TalkJS to your wishes before you publish it to your users.
When do I start paying for TalkJS?
Before you can use TalkJS with your real users, you have to enter payment information into our dashboard. Doing so will charge your card and give you access to a second TalkJS app for production data.
What's the difference between the development app and the production app?
TalkJS works 100% identical in production and development mode, except that we don't backup the data from development apps nearly as often. Because of this, don't run TalkJS in production using your development app.