Is calm.com Safe?

Great app however they are not geared to website usage which may give the impression they are not legit. The website serves more of an administrative purpose - sign up, purchasing, blogs, social media connection, etc. The actual apps, like the guided meditations and masterclasses and personal progress loggings, may not be available on some browsers/website which I believe was intentional (strictly my guess). Not all features on the downloadable app is available on the website version (especially with lesser user browsers like Opera). I think - not quite sure - they are working on making the website version more accommodating on Chrome and possibly Firefox.