Do I need to sign in? No. The app does not create accounts; all data is kept on your device.
陀螺軌跡是怎麼產生的？ App 使用 Apple Vision、AVFoundation 與 Core Image 在您的裝置本地分析影片、產生粒子軌跡，不會將影片上傳到網路。
How are the trails generated? The app uses Apple Vision, AVFoundation, and Core Image to analyse the clip and generate particle trails entirely on your device. Videos are never uploaded.
Where are processed clips stored? For Pro subscribers, generated clips land in the in-app "Battle Review" archive and your Photos album ("陀螺對戰相機" by default). For non-subscribers, the clip is discarded once you leave the result screen.
Top Match Pro 訂閱是什麼？ 解鎖儲存對戰、Photos 相簿同步、無限生成、搶先體驗新特效包。提供月訂與年訂兩種方案，新訂閱者享 7 天免費試用。
What is Top Match Pro? Pro unlocks saving battles, Photos album sync, unlimited renders, and early access to new effect packs. Monthly and yearly plans are available, with a 7-day free trial for new subscribers.
如何取消訂閱？ 請至 iOS【設定 ▸ Apple ID ▸ 訂閱項目】管理或取消。免費試用結束前 24 小時取消即不會收費。
How do I cancel my subscription? Open iOS Settings ▸ Apple ID ▸ Subscriptions. Cancelling at least 24 hours before the trial ends means you won't be charged.
還原購買在哪裡？ 設定頁的訂閱區塊或訂閱頁右上角點「還原購買」即可。請確認使用同一組 Apple ID。
How do I restore a purchase? Tap "Restore" in the subscription section of Settings or in the top-right of the subscription sheet. Make sure you're signed in with the same Apple ID.
What permissions does the app need? Camera (record battles), microphone (audio capture), and Photos (read selected videos / save processed clips). Manage them under iOS Settings ▸ Privacy & Security.
Processing takes too long? Longer clips take longer. Lower the output resolution to 720p in Settings to speed things up, and keep the app open while it renders.