> ## Documentation Index
> Fetch the complete documentation index at: https://docs.literalai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Scorers

> Scorers are functions (code or LLM-as-a-judge) that take an input, output and expected output and return a score.

Scorers are the basic building blocks of evaluation.
They are used to score `Steps` or `Generations` based on a `Score Schema`.

## From the Literal AI Platform

To create a scorer, go to the `Scorers` page and click on the `+` button in the upper right corner of the table.

### LLM-as-a-judge

Here's an example of the flow:

<Frame caption="Create Scorer">
  <img src="https://mintcdn.com/chainlit-5/SattO4WPsa_7pLDy/images/create-scorer.gif?s=f9d86d6554453786ab9dbef16ed45ef1" alt="Create Scorer" width="1497" height="763" data-path="images/create-scorer.gif" />
</Frame>

Once you have created a scorer, your next step is to use it.

<CardGroup cols={2}>
  <Card title="Online Evals" icon="wave-pulse" color="#2eb88a" href="/guides/online-evals">
    Learn how to evaluate your LLM logs in production automatically.
  </Card>

  <Card title="Prompt Experiments" icon="flask" color="#FF0581" href="/guides/experiment">
    Learn how to run experiments from the Playground.
  </Card>
</CardGroup>

## From the SDKs

For custom scorers, you can leverage the Literal AI SDK to [add scores](/guides/logs#add-a-score) to your `Steps` or `Generations`.