A: Hi there,
Thanks for your questions!

1. You can use your Headway App account on up to two devices simultaneously.
2. Sure, it's possible to continue listening/reading summaries on other devices with the same account.
3. In the case of AppSumo, we offer Lifetime access to Headway, which comes with a super flexible 60-day money-back guarantee. It allows Sumo-lings to try it out for two months to ensure it's the right fit! This flexibility isn't available on any other platforms, and that's the only difference between StackSocial and Appsumo deals.

Hope this helps!

Regards,
The Headway Team