This app was mentioned in 4 comments, with an average of 1.00 upvote
There are multiple apps that are perfect for this. Like this one. Doesn't scare you, plus you can set intervals so you know how long you've been meditating.
I'm currently using Medigong, because I have a 2.3 android phone and it's the only good app I found that's compatible !
It's just a timer, but very simple and efficient !
I use Medigong https://play.google.com/store/apps/details?id=de.xipa.medigong&hl=en I like it. It's free.
Medigong for Android