Swishjam (YC W23) - simple open source front end performance monitoring
Hey all - Collin here, co-founder of Swishjam (https://www.swishjam.com). Today we're excited to launch our simple, open-source (https://www.github.com/swishjam/swishjam) frontend performance monitoring solution to the world. Swishjam collects all of the performance related metrics from each of your real users' experiences as they visit your site (such as Core Web Vital metrics, resource load times, and more), and then makes sense of it for you by giving you intuitive visualizations and actionable insights on where performance bottlenecks exist on your site. The…
In plain words
Swishjam is an open-source frontend performance monitoring tool that collects real user experience metrics like Core Web Vitals and resource load times from website visitors. It provides visualizations and actionable insights to help developers identify performance bottlenecks on their sites. The tool is designed for teams looking to understand and improve their web application's speed and user experience.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hey all - Collin here, co-founder of Swishjam (https://www.swishjam.com). Today we're excited to launch our simple, open-source (https://www.github.com/swishjam/swishjam) frontend performance monitoring solution to the world. Swishjam collects all of the performance related metrics from each of your real users' experiences as they visit your site (such as Core Web Vital metrics, resource load times, and more), and then makes sense of it for you by giving you intuitive visualizations and actionable insights on where performance bottlenecks exist on your site. The web today is littered with massive javascript files, unoptimized images, and poor resource loading strategies, resulting in slow web sites and poor experiences for end users. We initially set out to solve for the third party javascript that is slowing down sites, however after talking with many users it became clear that there was a larger need helping users improve the overall performance of their entire frontend. While these users agree performance is of utmost importance to their web experience, most simply don’t know where to start to tackle the issue. The existing tools on the market today are complicated, and don’t provide actionable insights as next steps. Swishjam’s goal is to simplify performance and ultimately automatically apply performance improvements to your site on your behalf such as auto-image compression, CDN hosting, and strategically loading your page resources. While there are other options that exist to collect performance metrics (ie: CrUX data - https://developer.chrome.com/docs/crux/), we want to provide a dead simple, open-source way of collecting and visualizing your performance metrics, and give you actual actionable next steps to improve performance rather than leave it up to you to figure it out. This is an early alpha version, we plan to continue to roll out new monitoring and optimization tools in the coming weeks. If you're interested in web performance and optimizing page speed we'd love to chat.
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