I shared the promo codes for my app when i launched it on HN- http://news.ycombinator.com/item?id=4090465.<p>Thank you so much for the feedback. Have made my app free for a limited time. So those who missed the promo codes last time can get it now :)<p>Itunes link: http://itunes.apple.com/app/calci/id532226932?mt=8