--- title: "Reassure - Open Source Tool Measuring Performance Regression" description: "Explore Reassure, an Open Source tool for measuring performance regression in React Native apps." url: https://www.callstack.com/podcasts/reassure-performance-regression-measurement-tool updated: 2026-10-24T08:39:43.648Z --- # Reassure - Open Source Tool Measuring Performance Regression Explore Reassure, an Open Source tool for measuring performance regression in React Native apps. _Guests: Michał Pierzchala, Principal Engineer @ Callstack; Maciej Jastrzębski, Software Engineer @ Callstack · Host: Łukasz Chludziński, Engineering Manager @ Callstack · Published 2022-07-28 · Duration 01:02:51 · Category: Open Source_ Listen: [YouTube](https://youtu.be/8pTQKBHFs-8) · [Spotify](https://open.spotify.com/episode/4zi8hQSYOayircY3C8oa45?si=fc03134a0d754d99) · [Apple Podcasts](https://podcasts.apple.com/us/podcast/reassure-open-source-performance-regression-measurement/id1525543072?i=1000571503969) · [SoundCloud](https://soundcloud.com/user-985069846/the-react-native-show-podcast-episode-12-mobile-payments-in-react-native?utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing) The 15th episode of The React Native Show podcast is focused on [Reassure](https://www.callstack.com/open-source/reassure), an Open Source library developed and maintained by the Callstack team, especially by Maciej Jastrzębski and Michał Pierzchała. What’s worth adding, at the startpoint, Reassure was developed as an in-house tool for one of our clients - [Entain](https://entaingroup.com/). However, thanks to their willingness to develop the React & React Native ecosystem, we decided to make it [Open Source](https://www.callstack.com/open-source). ## The story behind Reassure In the first part of the podcast, our experts explain what Reassure is, how it works, and what was the “why” behind creating it. They cover the following topics: - What is Reassure? - What problems does Reassure solve? - What problem the library doesn’t solve? Omits on purpose. - Reassure features description. ## Collaboration with Entain After that, Maciej and Michał reveal the story behind creating Reassure enriched by some interesting details, including our cooperation with Entain. You’ll listen about: - Detailed story behind Reassure, - Collaboration with Entain, - Full Reassure team. ## Going open-source What’s more, Maciej and Michał share their story of moving Reassure from an in-house project to Open Source describing all the technical and law challenges they had to face. A real treat for all Open Source enthusiasts! In the third part, Maciej and Michał share their plans for future development of Reassure like, for example: - Making Reassure first-class support for web React, not only for React Native. - Collaborating with hardware/CI companies to create a reliable, easy-to-use environment to run stable performance tests. - Creating ready-to-use GitHub Actions to reduce manual setup. ## Live coding session In the last part, Maciej jumps into the special live coding session, showing Reassure abilities and explaining how to properly use the library. So, if you are curious about this brand-new performance optimization tool, pick up your favorite streaming platform and listen to the full episode or watch it on our YouTube channel! Insights ## Learn more about Open Source Here's everything we published recently on this topic. [View all](https://www.callstack.com/insights) - [Visualizing Open Source Licenses to Analyze Compliance and Reduce Legal Risk](https://www.callstack.com/blog/visualizing-open-source-licenses-to-analyze-compliance-and-reduce-legal-risk) (Aug 7 · Article): Discover how license-kit visualize maps and analyzes your dependency graph, helping you spot license issues, duplicates, and restrictive packages with interactive views, stats, and AI-powered summaries. - [How Definitely Typed Changed TypeScript Forever](https://www.callstack.com/podcasts/how-definitely-typed-changed-typescript-forever) (Mar 26 · Podcast): Discover the story behind Definitely Typed with its creator, Boris Yankov, and learn how it became essential for type-safe JavaScript in the TypeScript ecosystem. - [Introducing the OMH Cloud Storage Module](https://www.callstack.com/blog/introducing-the-omh-cloud-storage-module) (Oct 14 · Article): Discover the OMH Cloud Storage Module. This open-source solution simplifies cloud storage integration for React Native apps. - [Introduction to the React Native OMH Maps Library](https://www.callstack.com/blog/introduction-to-the-react-native-omh-maps-library) (Jul 12 · Article): Discover how the React Native OMH Maps library simplifies map integration with cross-platform compatibility, ease of use, and customization options. - [Behind the Scenes of React Native 0.74 Release](https://www.callstack.com/podcasts/behind-the-scenes-of-react-native-0-74-release) (Apr 22 · Podcast): Join the release crew members to find out what new features and improvements React Native 0.74 brings to the cross-platform development world. - [Callstack OSS Update](https://www.callstack.com/podcasts/callstack-oss-update) (Apr 27 · Podcast): April 2023 Callstack OSS Update: RFC for Expo Config Plugins, Re.Pack & Paper news. - [NPM Kiosk and Open Source Monetization](https://www.callstack.com/podcasts/npm-kiosk-and-open-source-monetization) (Feb 21 · Podcast): Explore the pros, cons, and lessons from gating access to open source libraries, plus insights on handling payments with tools like NPM Kiosk and Reassure. - [React Native Paper 5.0 - What’s New?](https://www.callstack.com/blog/react-native-paper-5-0) (Dec 6 · Article): React Native Paper 5.0 is here! Dive into the latest updates and improvements. - [React Native Programming Languages](https://www.callstack.com/podcasts/coffee-talk-5-react-native-programming-languages) (Sep 15 · Podcast): Join Łukasz Chludziński and Abi Thiao as they discuss React Native programming languages ranging from JavaScript and TypeScript to Lua.