National Cancer Institute's QuitPal is a free smartphone app to support smokers working to become smoke-free.
 

The interactive app was developed using proven quit strategies and tools to help change behavior and assist with giving up smoking. QuitPal's features include: 

• Set a quit date, financial goals, and reminders
• Track daily smoking habits with an easy-to-use calendar
• See graphs tracking money saved and number of packs not smoked
• Receive health milestones and craving tips to stay motivated
• Connect with social networks to give milestone updates
• Create a video diary, and watch personalized video messages from loved ones
• Access NCI's Cancer Information Service by toll-free phone line or live chat 

NCI QuitPal was developed by the National Cancer Institute using the latest evidence-based smoking cessation methods and behavior change theory.