CPM is the older currency, built for brand and awareness buying: a platform charges per thousand times the ad was served, whether or not anyone actually watched it play. CPV flips the bill to only the views that count — but "counted" is platform-defined and inconsistent, meaning anywhere from a few seconds of play to a completed watch or a click, depending on the platform and ad format.
That difference changes what creative is actually being rewarded for. Under CPM, a weak hook costs the same as a strong one — the impression was delivered either way, watched or not. Under CPV, a weak hook is the expensive problem: if nobody watches long enough to count as a view, the impression was effectively free, and the ad only gets billed once it holds attention.
Which model a campaign runs under is usually the platform's choice, not the advertiser's, but it's worth knowing which one you're under before judging a creative's performance — a hook-heavy cut and a slow-building one can be optimizing for genuinely different scoreboards.
In practice
- Check what counts as a "view" on the specific platform and format before comparing CPV numbers across two campaigns — the definition varies enough to make raw comparisons misleading.
- Under CPV, front-load the hook harder than you would for a CPM buy — a skip before the count threshold is a wasted view, not just a weak one.
- Under CPM, judge creative on completion and engagement separately from cost, since a weak ad and a strong one are billed identically.
The mistake to avoid
Comparing a CPM number against a CPV number as if they measured the same thing. One prices delivery, the other prices attention — a "cheaper" number on one model can be a worse buy than a "pricier" number on the other.
Where you will run into it
- Faceless Video Generator — Script in, narrated episode out, nobody on camera.
- AI Video Generator — Text-to-video, image-to-video, and story chaining in one studio.
- AI Caption Generator — Drop a video, get timed captions. Free, on your device, no upload.
Related terms
Completion rate
Completion rate is the share of people who watched a video all the way to its last frame — one number, unlike the full retention curve, and the one most short-form platforms weight heavily in distribution.
Hook rate
Hook rate meaning: the share of people shown a video who are still watching a few seconds in. It grades the opening, not the body.
Share of voice
Share of voice is a brand's portion of the total conversation in its category — mentions, tags and citations relative to named competitors — tracked over time as a competitive gauge rather than a per-post metric.
Retention curve
Retention curve meaning: how many starters are still watching at each second. Watch time is the area under that curve.
Spark Ads
Spark Ads meaning: TikTok budget behind an existing post (yours or a creator's) so paid reach keeps the real likes, comments, and shares.
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