> For the complete documentation index, see [llms.txt](https://help.rankability.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.rankability.com/track/understanding-spi.md).

# Understanding SPI

SPI is Rankability’s 0–100 Search Performance Index across the tracked traditional, video, AI mention, AI citation, and local surfaces that apply to a query.

## Global query weighting

| Category           | Weight |
| ------------------ | ------ |
| Traditional search | 30%    |
| Video              | 10%    |
| AI mentions        | 35%    |
| AI citations       | 25%    |

## Local query weighting

| Category           | Weight |
| ------------------ | ------ |
| Local              | 60%    |
| Traditional search | 10%    |
| Video              | 5%     |
| AI mentions        | 14%    |
| AI citations       | 11%    |

Platform weights are normalized over the platforms present in the project. A category with no applicable data does not mean the same thing as a measured score of zero.

## Score bands

| Score  | Label          |
| ------ | -------------- |
| 90–100 | Very Strong    |
| 70–89  | Strong         |
| 50–69  | Moderate       |
| 30–49  | Weak           |
| 15–29  | Very Weak      |
| 0–14   | Extremely Weak |

## Use SPI

Compare the same project over time and inspect the category breakdown before deciding what changed. Adding platforms or locations changes the measured coverage and can change cost and interpretation.


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