Stoppur allows you to add a timer to your iDevice's LockScreen

  Stopwatch is a tweak launched last night in Cydia, and he has in his sights those who use the timing function of the Clock application. Using this tweak you can replace the clock in the LockScreen with a timer and you can quickly time whatever you want without opening the Clock application. The tweak has a settings menu in the Settings app of iOS, there you can configure it and choose its exact position, so that it fits your needs perfectly.

Requires iOS 6 or higher. Stoppur brings the stopwatch to the LockScreen. Enable the tweak in the settings app. Uses an "extra panel" with the stopwatch-time for compatibility with tweaks that remove the top area in the lockscreen such as forceast, lockinfo and springtomize. See screenshot for "forecast". You can also set the exact location of the panel to make it fit your setup.

  Stoppur is available at the price of $1 in the repo BigBoss al Cydia.