Inside the team, Cloudverest keeps every version and runs frame-accurate review. With the client, Pactroom puts the contract, review, delivery and payment in one link.

Inside the team: Cloudverest
Review video the way an editor does: frame by frame, with every comment tied to a timecode.
A frame-accurate player
Step frame by frame against an HH:MM:SS:FF timecode, shuttle with J, K and L, loop, and set In and Out points.
Comments on the frame
Comments carry their timecode. Draw on a frame with a pen, arrows, shapes and text, and the drawing becomes a timecoded comment with a thumbnail of the frame.
Versions side by side
Play up to three other versions against the current one, as a wipe, side by side or A/B, in sync frame by frame.
Approvals
Each version gets a status, branch by branch: Approve, Approve with Conditions, Request Changes or Mark for Review. Request review emails the teammate you pick.
Review links
Share a file by link with someone who has no account. They play it in the browser and, when you allow comments, leave feedback at a timecode. A link can have a password and an expiry date, and you can revoke it at once.
With the client: Pactroom
Pactroom is on a waitlist. This is how pactroom.com describes it.
One link
Contracts, review, delivery and payment on video work, in one link.
Client review
The client reviews frame by frame on watermarked previews.
Deposit and delivery
The client signs and pays a deposit, and the files unlock when the project is paid.