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Our group leader has a fabulous pyramid shaped meditation timer that he bought when on a trip to Asia. I love it! The bells on it are lovely. Alas, I do not have one. So I must use my smart phone. I had been happily using Insight Timer, but today in my twitter feed several people had mentioned "Sattva" as a good app. It's free, so I downloaded it and it's pretty loaded with stuff for a free app. There are guided meditations, music, chants, all sorts of settings. The one thing I don't like is they keep a "leaderboard" as if having the most minutes should be a good reason to meditate, but perhaps it doesn't matter what the motivation is because everyone has their own reasons for meditating anyhow.
Do you use a timer or do you just meditate until you feel you are done? I have done the latter as well but find it varies too much. I do better with the timer. There were times I would sit and I couldn't stand it anymore, sure I had been there for over an hour only to find it had been 6 minutes, LOL. This morning I had barely gotten into it before the timer went off, though the Sattva app has an option to continue if you are not ready to stop.
Oh, I have an android phone but I would guess Sattva is available in the Apple store as well.