SynthStack has two editions:

• Community Edition (this repo): MIT License (see ../LICENSE)
• SynthStack Pro (separate repo): Commercial license (see ../COMMERCIAL-LICENSE.md and https://synthstack.app/pricing)

Yes. The Community Edition is MIT licensed, so commercial use is allowed.

Yes, as long as you comply with the MIT License terms (keep the copyright + license notice).

Only if you want Pro-only features and/or access to the Pro codebase and support.

• MIT License: ../LICENSE
• Pro terms: ../COMMERCIAL-LICENSE.md (Pro repo) and https://synthstack.app/pricing