# Rarity Tensor supports up to 4 rarity systems per collection. 2 (HowRare and MoonRank methodology) are calculated automatically and are available for every collection, and 2 (Trait Normalized and Team Vision) rely on HowRare's API and are only enabled for some collections.![](/files/UAzUvhVuWtQBlY4HR5Un) We receive plenty of questions about why the rank for item X on Tensor doesn't match the rank for item X somewhere else. Our 2 main methodologies are designed to mirror HowRare/MoonRank as closely as possible, but HR/MR also apply manual adjustments, which we don't. This means there are bound to be differences for some collections. You can always check HR/MR directly to be double-sure. Overall, realize that rarity is more art than science and that there is no "correct" rarity - just different systems. On Tensor we tried picking ones that we personally think are most mathematically sound - but you can always consult with any external system you believe to be better. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.tensor.trade/trade/troubleshooting/rarity.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.