The same idea as Video Replay for Windows — watch yourself train seconds after you move, across multiple delayed camera panels — built natively for iPhone and iPad.
The app is listed on the App Store as Video Replay Coach; on your device it appears as Video Replay.
Every feature is free for a 7-day trial, starting the first time you open the app. After that, Video Replay is a subscription: US$4.99 a month or US$49.99 a year, billed through your Apple ID and shown in your local currency on the App Store. See every platform's features and pricing side by side.
Open your friend's invite link on your iPhone or iPad — it copies their invite code and takes you to the App Store. The app asks you to paste the code when it first opens. Referral rules.