Real numbers on every YouTube page.
Lens shows what a video actually did against its own channel, what a channel’s health is, and why a title worked — on YouTube itself, while you browse. No credit wall, no guessed numbers, nothing to set up.
Add Lens to Chrome — freeWhat Lens is
A measuring instrument for YouTube, built by a growth agency for its own research and given away.
Most tools show you views. Views tell you almost nothing: 50,000 views is a disaster for one channel and a career-best for another. Lens shows every video’s multiple — how it did against what its own channel normally does — so a breakout looks like a breakout whatever the channel’s size, and a flop on a huge channel looks like the flop it is. Around that one number Lens adds the channel’s health, the video’s speed, and the title decoded against everything measured in its category.
The one rule
The scale
The multiple is views divided by the median views of the ten uploads nearest in time on the same channel — Shorts against Shorts, long-form against long-form.
| Badge | Multiple | Meaning |
|---|---|---|
| ≥5× | 5.0 and up | Breakout. The packaging or subject reached far beyond the channel’s usual audience. Worth studying closely. |
| ≥2× | 2.0 – 4.9 | Winner. Twice the channel’s norm or better. |
| 1–2× | 1.0 – 1.9 | Par. Did what this channel usually does. |
| <1× | under 1.0 | Under. Below the channel’s own norm. |
| New | under 2 days | Too new to grade. Early views are arithmetic, not a signal. |
On feeds, search results and channels
- Measured
- From the channel’s last 25 uploads and its tracked history. Similar channels come from measured subjects and fields, not a keyword search.
On a video
- Why
- It answers the question every creator asks after a hit: was it the subject, or the way it was said? The decode shows which parts have a track record in this category and which were a one-off.
- Measured
- The field is the channel’s own: the competitors it is swept with, or else the channels measured as nearest to it (they share its subject phrases, sit within ten times its size, and have ten or more measured uploads), named on the line as “X and 14 channels near it”. Never a YouTube category. A channel with too few neighbours in the database gets structure only, from the whole database.
The Tools tile
One ▶ Tools launcher bottom-right on every video. Six tools, each with a hover explanation and grouped by what a click does: into your VideoCore (red), a download to your computer, shown on this page (blue). Switch any of them off in the popup.
The popup
The ▶ icon in Chrome’s toolbar. It reads the page you are on.
This page shows the numbers already on screen: on a video, its multiple, views, per hour, engagement, age and comments; on a channel, its health, subscribers a day, uploads a week, best recent outlier, biggest lever and similar channels; on any list, how many videos are rated and how many sit in each band. Tools on this page lists every tool that applies here as a button. Settings fold below: the badges, the comment counts, and each tool on or off.
Five ways to use it
Install and settings
Questions
Where do the numbers come from?
Public YouTube data, measured against each channel’s own rolling baseline — the same baseline VideoCore uses everywhere, so the extension and the platform never disagree.
Why is there no click-through rate?
YouTube does not expose impressions or CTR for any video to anyone outside its owner’s Studio. A CTR shown by any extension is an estimate. Lens shows what is measured and says what is not.
Why does a new video say “New”?
Because a two-day-old video’s multiple is meaningless: the baseline is lifetime views and the video has had no lifetime yet. Lens shows the tracking rate and waits.
Is it really free?
Yes, with no credit wall and no meter. VideoCore’s paid plans exist for creators who want the full platform; Lens does not nag while you research.
What does Lens collect?
It reads public YouTube page data to compute its scores. Your browsing is not tracked or sold. The on-device summary never uploads the video.
Who makes it?
ViewsToClients, a YouTube growth agency headed by Jake Trinder, and VideoCore, its platform. Lens is the instrument the agency uses for its own research.
Measures
| Term | Exactly |
|---|---|
| Multiple | Views ÷ median views of the ten uploads nearest in time on the same channel, Shorts and long-form kept apart. |
| Views per hour | Views ÷ hours since publish. Measured, never averaged from a model. |
| Engagement | (likes + comments) ÷ views, as a percentage. |
| Health | 0–100 from four measured pillars: consistency (cadence), engagement, momentum (recent vs prior), reach (views per subscriber). |
| Winner share | Of the videos in a category wearing a pattern, the share that beat 2× their own channel. |
| Lift | A pattern’s winner share ÷ the field’s overall winner share. 1.9× means titles with that construction win almost twice as often. |
| Similar channels | Channels in the same measured field nearest in subscriber count, or channels whose videos share the most measured subjects. |
| Named in | Other channels’ videos in the last year whose title names this channel as a whole phrase: collabs, guest spots, interviews, stories. The best one is the highest multiple against its own host’s baseline. Counted from the database, so a channel nobody has measured shows nothing. |