# TypeScript

Seismic provides two TypeScript packages:

| Package                                                                | Purpose                                         | Use when                             |
| ---------------------------------------------------------------------- | ----------------------------------------------- | ------------------------------------ |
| [seismic-viem](https://docs.seismic.systems/clients/typescript/viem)   | Low-level SDK built on viem 2.x                 | Server-side, scripts, non-React apps |
| [seismic-react](https://docs.seismic.systems/clients/typescript/react) | React hooks layer built on seismic-viem + wagmi | React applications                   |

`seismic-react` depends on `seismic-viem` — install both if you're building a React app, or just `seismic-viem` for everything else.