The four layers
The Signal Score breaks down your channel's performance into the four signals that YouTube's algorithm actually uses to decide whether to distribute your content. Each layer is scored independently — so you can see exactly which signal is your primary constraint.
The highest-weighted layer. Measures your channel's click-through rate against the 4–8% threshold. A low CTR Signal means thumbnails and titles aren't earning the click — and the algorithm responds by reducing distribution.
Measures the volume and consistency of impressions YouTube is serving. Low impression depth means the algorithm hasn't committed to distributing your content — usually because CTR hasn't earned that investment yet.
How efficiently the channel converts distribution into actual views. VPI combines CTR and watch time — a channel that gets clicks but loses viewers quickly will show a low VPI despite a reasonable CTR.
Publishing consistency. The algorithm learns your channel faster with a regular data stream. Channels publishing twice per week earn full points. Gaps in publishing reset momentum and slow classification.
What does my score mean?
Why a score instead of individual metrics?
YouTube's algorithm doesn't evaluate your channel on one metric. It evaluates a combination of signals simultaneously. A high CTR with terrible watch time doesn't earn distribution. Perfect upload consistency with zero impressions doesn't move the needle.
The Signal Score reflects this reality. It weights each layer by its actual impact on distribution and produces a single number that tells you where you stand — and more importantly, which layer is your primary constraint.
The primary constraint
The most important output of the Signal Score isn't the total — it's the primary constraint. The primary constraint is the one signal layer with the largest gap between your current score and the maximum possible score for that layer.
Why this matters: Most channels have one bottleneck. Fix the bottleneck and the other metrics often improve automatically. If your CTR Signal is 10/30, that's your 20-point gap — and fixing it will likely improve your VPI and Impression Depth at the same time, because more clicks mean more data for the algorithm.
Signal Score: 55/100. CTR Signal: 10/30 (primary constraint). Impression Depth: 20/25. Views Per Impression: 5/25. Upload Velocity: 20/20. The 45-point gap is concentrated in two layers — CTR and VPI — both downstream of the same root cause: packaging. Fix the thumbnails, both metrics move.
How is the Signal Score different from vidIQ or TubeBuddy scores?
vidIQ and TubeBuddy score individual videos based on SEO optimization — keyword density, tag coverage, title formatting. That's a pre-upload optimization score, not a post-live diagnostic.
The Signal Score measures what happened after you published. It reads your actual analytics data — real impressions, real CTR, real view counts — and tells you what the market is saying about your channel. You can have a perfect vidIQ score and a terrible Signal Score. The vidIQ score tells you you optimized the right keywords. The Signal Score tells you whether anyone clicked.
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