“OSHIStamp” lets you take timestamped notes in real time while watching YouTube videos, including live streams. Insert timestamps with one tap and jump back by tapping them. Adjust time precisely with a long press. Notes are saved per video, and you can reopen videos from your memo list. Includes skip controls and playback speeds (0.5x–2.5x). You can also export/import data for backup, with support for cloud storage like Google Drive.