# Tally architecture

{% embed url="<https://www.youtube.com/watch?v=NiCd7D5bhZk>" %}

Tally is built on top of the [Governor standard](https://docs.openzeppelin.com/contracts/4.x/governance). Tally indexes the on-chain data from and enables users to make calls to Governor smart contracts running autonomously on the blockchain.

To be compatible with the Tally app, we recommend you use OpenZeppelin's [Governor contract](https://docs.openzeppelin.com/contracts/4.x/api/governance). This modular, battle-tested system of organization smart contracts gives token holders control of their organization on-chain.

A typical Governor organization uses three contracts: a token contract, a Governor contract, and a timelock contract.

<figure><img src="https://883959685-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MQO0N_aitpkSUyz4BYE%2Fuploads%2F2ckZ5QbkELwnwmmtluU5%2Fimage.png?alt=media&#x26;token=492797a6-2264-4ee5-b6ba-1e00390bf631" alt=""><figcaption></figcaption></figure>