VSP ratio — views-per-subscriber — is the core metric behind Tubetific's Outlier Detection signal: a video's view count measured against the channel's subscriber count, used to find videos that are massively outperforming what the channel's existing audience size would predict.
Quick answer
VSP ratio (views-per-subscriber) measures how far a video's views exceed what its channel's subscriber count would normally predict — Tubetific's Outlier Detection uses it, weighted toward channels under ~5,000 subscribers, to find videos the algorithm is actively pushing past the channel's existing audience.
A high VSP ratio means a video is reaching far more viewers than the channel's own subscriber base would explain on its own — a signal that the algorithm, not just the channel's existing audience, is actively pushing the video to new viewers. Outlier Detection specifically weights small channels (roughly under 5,000 subscribers) more heavily, since a large channel getting a lot of views is expected, while a small channel doing the same is a genuine signal that a topic or format is resonating beyond that channel's normal reach.
MEGA tier: 100x+ VSP -- the algorithm is aggressively promoting this content right now
HIGH tier: 50-100x VSP -- a strong signal the format is working in this niche
MODERATE tier: 20-50x VSP -- worth watching, but a single result alone is weaker evidence
Only channels under roughly 5,000 subscribers qualify for scoring -- deliberate, since a large channel's high view count is expected, not a signal
Is a high VSP ratio the same thing as a video 'going viral'?
Related but not identical -- 'viral' usually just means a high absolute view count. VSP ratio specifically measures views relative to the channel's own normal reach, so a small channel with a 240x VSP ratio can have far fewer total views than a viral video from a mid-size channel while still being the stronger outlier signal.
Why does VSP ratio only apply to small channels?
Because a large, established channel getting a lot of views is expected -- it isn't evidence the algorithm newly decided to reward that content. A small channel exceeding its own normal reach is the genuine signal Outlier Detection is built to find.
Does a high VSP ratio guarantee a format will work if I copy it?
No -- it's evidence a format is currently in favor, not a guarantee that reproducing it will get the same result. Audience fit, execution quality, and timing all still matter, which is why the full Outlier Detection guide recommends copying the format, not the exact topic.
How is VSP ratio different from gap score?
VSP ratio measures whether a specific video is outperforming its channel's normal reach; gap score measures whether existing top-ranking videos for a keyword are satisfying viewer demand. They answer different questions -- one is about a video's performance, the other about a keyword's opportunity.