If you want a web-based approach that works on desktop and mobile, try the simple tool I built: http://minutestocountdown.com/ http://minutestocountdown.com/ I

If you want a web-based approach that works on desktop and mobile, try the simple tool I built: http://minutestocountdown.com/ http://minutestocountdown.com/ I'm testing a phone number that works via text or phone call as well and I'd love to have your feedback if you get a chance to try it.