As of today you can share your chart with others by simply entering the the email addresses of the persons you would like to invite to collaborate on your chart. Tom's Planner does the rest for you. It will send the emails to the others and provide them with instructions on how to accept your invitation. You can invite up to 50 persons at a time.Read more
No app is required, just open Tom's Planner in your mobile browser and you're good to go! The look and feel is exactly as in a normal browser.