The best alternatives to BestShot are Smash Tennis, ScoreLord Tennis, and TieBreak. If these 3 options don't work for you, we've listed a few more alternatives below.
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Tennis Scorecard is a beautiful and intuitive app used for keeping score of tennis matches. Keep score from your iPhone as a spectator or handoff the match to your Apple Watch for a hands-free experience while you're playing.
This is your perfect app if you are a tennis player (amateur or pro) and you want to have a history of your matches. The app allows you to track your matches in real time and shows your progress afterwards. It is very friendly and easy to use. You will be able to see all of your opponents and the ratio of wins/lost matches with them.
csgo-tracker is a free and open source app that lets you track of your CS:GO stats and matches and get real time updates about your performance in the current match.