The Most important App on your phone as a Maker

So its September 1st and a big thing is changing in my life. Along with that change I am going to challenge myself to post a video a day for the next 30 days. Today on Day 1 I want to talk to you about the most important App on your phone that can help you the most in your work shop.
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[@MountainFisher]

I thought for a minute, what app? I have a flip phone, but it does have a timer on it.

[@CraftsmanshipwithAsh]

Any timer will do