This "count-up timer" app is to serve two audience. For adults, you have your familiar timer display format. For young toddlers who don't know how to read numbers yet, there is a round pie or circle that act like a timer. A pie will slowly "grow" and when the time is up, a full pie or circle is formed.
Get the installer of Pie Timer 12.0 that is available for free and check out users' reviews on Droid Informer. The app is designed for Android 2.1 and above. The download of this application doesn't contain viruses or any kind of malware. Sgh has designed the tool that falls into the Productivity category.
The latest update of Pie Timer was released on Oct 4, 2016 and the app has been installed by over 10 users. The overall rating for this application is 4.3 on Google Play.