This app was mentioned in 3 comments, with an average of 1.33 upvotes
https://play.google.com/store/apps/details?id=com.istrobosoft.tuner&hl=en
This is not free but it is the absolute best tuner that one can obtain for their phone. I have used to set the intonation of guitars. Spend $10 bucks it is worth it. I personally dis not find a tuner app I liked. Maybe if you type in peterson istrobosoft you might receive reviews for free apps. Best of luck
Of course you could slap the name on an app and get close enough... https://play.google.com/store/apps/details?id=com.istrobosoft.tuner&hl=en