What different curve shapes mean, and how to read the first-15% hook window together with drop-off points.
This page is AlgoLens's own analysis, not an official statement from YouTube. It's meant to help you read your own video's curve, not to compare you against other channels.
TL;DR — Retention rate is the average percent of your video viewers watch. Don't just look at the overall number — check the shape of the curve: a steep early drop points to a weak hook, a sharp mid-video drop points to a specific bottleneck, and a gradual decline throughout is mostly normal.
Definition
Audience retention (retention rate) is the average percentage of a video that viewers watch. YouTube plots this as a curve over the length of the video — 100% at the start, tapering down as viewers leave.
Two specific readings on that curve matter more than the average: the hook window — the first roughly 15% of the video (about the first 30 seconds) — and the drop-off point, the spot with the steepest decline.
What curve shapes usually mean
Steep drop in the first 15%
Viewers are leaving before the video makes its case. Usually points to the opening (hook), not the middle or end of the video.
Sharp drop at one specific point mid-video
A single bottleneck — a slow segment, a tangent, or a section that didn't deliver on the title/thumbnail's promise.
Gradual, steady decline throughout
Mostly normal — nearly every video loses some viewers over time. Worth attention only if it's steeper than your own channel average.
A spike or plateau partway through
Often means viewers are replaying that section — usually a positive signal, not a problem to fix.
What to do
1
Check the hook window first. In AlgoLens's Video Analysis tab, your hook-window retention is compared against your own channel's peer average — a large gap below average points to the opening, not the rest of the video.
2
Find the drop-off point. Drop-off analysis shows exactly where the steepest decline happens, expressed as a percentage-point drop at that timestamp — watch that section back and ask what changes there.
3
Read the bottleneck interpretation. AlgoLens frames the biggest gap as one of three stages — discovery, retention, or subscriber conversion — so you know which stage to work on first instead of guessing.
Where AlgoLens helps
The Video Analysis tab shows the full retention curve, drop-off analysis, and hook-window retention (PRO) for any single video, alongside card CTR and traffic sources — so you can see cause and effect on one screen instead of piecing it together from Studio.