B4X vs Tabris.js

B4X plans

• B4AFree
• B4JFree
• B4RFree
• B4i Standard$59, paid once
• B4A Standard$59, paid once
• B4i Standard + Hosted Mac Builder$85, paid once

Tabris.js plans

• FreeFree
• EnterprisePriced on request

Pick B4X if…

B4X suits developers building across mobile, desktop, server, and IoT targets, especially those able to reuse code among B4A, B4J, and B4i projects. B4i users should account for its stated Apple account, device, and IDE requirements.

Pick Tabris.js if…

You want what its maker publishes above — check its page for the details.