# Mobile app The typescript frontend calls native modules in Swift and Kotlin that call [witnesscalc](https://github.com/0xPolygonID/witnesscalc) and [rapidsnark](https://github.com/iden3/rapidsnark). Using the PolygonID stack for client-side proving allowed us to get down to \~4s proofs on the latest iPhone for our 450k constraint circuit, and \~200ms for our 7k constraints circuit. --- # 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.openpassport.app/docs/technical-docs/mobile-app.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.