The Heartbleed Scanner by KS Mobile scans your device and all of its apps to see if it's at risk from the Heartbleed vulnerability.
To use it, tap on the big button that says "scan" and it will check your entire device. Afterwards, it the status of your system as well your applications.
An explanation of Heartbleed redirects outside of the app to their website which is annoying.
The design is intuitive and easy to use, but you are ultimately at the mercy of developers to fix the apps.