Audience Quality
What's a good Lookalike Performance Index?
A good Lookalike Performance Index for a local business is 1.20 or higher. Performance ratio of lookalike audiences vs. broad targeting (1.0 = same performance). An excellent Lookalike Performance Index — the top tier Karbon Agency grades client campaigns against — is 2 or higher, while 0.80 marks the minimum acceptable tier.
The three tiers Karbon grades against
| Tier | Value | What it means |
|---|---|---|
| Minimum | 0.80 | The floor. Below this, something is broken. |
| Recommended | 1.20 | The tier a healthy campaign should hit. |
| Excellent | 2 | Top-tier performance worth defending. |
Higher is better for this metric.
Why Lookalike Performance Index matters
Validates whether your seed audiences are actually valuable. Below 1.0, broad targeting is cheaper. Above 1.2, your first-party data gives you a real competitive edge.
Where does your Lookalike Performance Index land?
Karbon Agency grades every client campaign against these exact tiers, live on a dashboard — no guessing, no quarterly PDFs.