# Evaluators

Ownlayer offers 17 different kinds of evaluators covering basic search, JSON validation, and custom evaluators that leverage LLM as the judge. If you're not sure about what is the best, we recommend you start from **Playground** where you can test for the most suitable ones based on your data format.

### Variables

<table><thead><tr><th>Attribute</th><th>Description</th><th data-hidden></th></tr></thead><tbody><tr><td>Input</td><td>Model input</td><td></td></tr><tr><td>Prediction</td><td>Model output</td><td></td></tr><tr><td>Prediction_b</td><td>A different model output from the same input</td><td></td></tr><tr><td>Reference</td><td>Ground truth</td><td></td></tr></tbody></table>