I've used the Calm app for the introduction course to learn about how to meditate and start with guidance, then I continued on my own. Paying 10$ monthly for sitting still is hilarious. IMHO the quantity of these kind of apps, guides and whatnot simply offer a paradox of choice, which is ironic, since the user wants to relax, not obsess if he bought the right app, subscription and/or meditation technique.<p>I now use Enso app [1] just to alert the 15 min duration, it's free on the App Store (optional purchases for different alert bells).<p>[1] <a href="https://itunes.apple.com/us/app/enso-meditation-timer-bell/id840637879?mt=8" rel="nofollow">https://itunes.apple.com/us/app/enso-meditation-timer-bell/i...</a>