1. Frame-accurate comments. Tapping a moment and typing should pin the note to that exact frame. Frame.io, Vimeo Review, and Dropbox Replay all do this. 2. Guest review links. Clients should not need an account. If the app forces signups on reviewers, skip it. 3. Version stacking. V2 should sit next to V1 with changes visible, not buried in a chat thread. 4. Mobile notifications that actually arrive. Email-only notifications mean feedback waits until Monday. 5. Drawing on frames. Circling the thing you mean beats describing it in words. Sources: FFmpeg, HandBrake Frame.io (now Adobe-owned) is the professional standard. Vimeo Review is simplest for small teams. Dropbox Replay is fine if you already live in Dropbox. The wrong choice is reviewing cuts over WhatsApp voice notes. Timestamps get lost, versions multiply, and nobody knows which cut is current.
