Sharing your Smartsheet is easy, as you can email a link to an unlimited number of users, and I like how easy it is to control who has editing power and who can simply view the sheet. Smartsheet's mobile apps (available for Android and iOS) are also easy to use, and the sheets you create are easy to view on even the small screen of a smartphone--something that's not always true of spreadsheets.
Smartsheet is free for 30 days. After that, plans start at $14 per month and go up from there. It is a robust project management app that straightforward business folks will appreciate, but it does lack the built-in collaboration of Asana and the simple, visual appeal of Trello.
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