At this stage, Tango does not offer a mobile app and is optimized for use in the browser on desktop computers.
For users looking to capture how-to guides or documentation on mobile or tablet apps:
There is no automated way to do this today, BUT many Tango users have taken mobile screenshots, sent them to their desktop device and then uploaded them manually to individual steps in their Tango Workflows using the Insert a Step feature.
For users looking to view on smartphones or tablets:
Tango Workflows are mobile web friendly!