---
title: "JSX to Live Activity: The Story of Voltra"
description: "Learn how Voltra brings React to iOS Live Activities and Dynamic Island by translating JSX into SwiftUI through a custom React renderer."
url: https://www.callstack.com/events/jsx-to-live-activity-the-story-of-voltra
updated: 2026-10-24T08:39:20.250Z
---

# JSX to Live Activity: The Story of Voltra

Learn how Voltra brings React to iOS Live Activities and Dynamic Island by translating JSX into SwiftUI through a custom React renderer.

_Talk · 2/5/2026, 5:30 PM [CET] · Gdańsk, Poland · Recording: 31:42 · Category: React Native_

Organizer: Meet.JS

Speakers: Szymon Chmal (Software Developer @ Callstack)

[Watch the recording](https://www.youtube.com/watch?v=NmMTwjlTWwM)

What if you could ship native iOS Live Activities and Dynamic Island experiences without writing a single line of Swift? This talk tells the story of Voltra, a library born from a viral tweet and a collaboration between Saul Sharma and Callstack to bridge the gap between React and native iOS extensions.

We'll go behind the scenes of building a custom React renderer from scratch to translate JSX into SwiftUI primitives, bypassing the traditional "Swift wall." You will learn how we tackled the extreme technical constraints of the platform: from the tiny 4KB data limit to server-side driven UI that doesn't require a pre-shipped implementation.

Join us for a deep dive into Voltra's architecture and learn how you can start shipping React to a brand-new platform today.