Browser Extensions for Zwifters: ZwiftPower ZRS (Improved Racing Score Visibility)
Last week, a comment from an astute reader alerted me to a browser extension I’d never heard of: ZwiftPower ZRS.
Available for Chrome, Edge, and Firefox, the extension delivers a simple but useful upgrade to the ZwiftPower experience for racers by adding Zwift Racing Score results to event pages. Here how it works…
Installation
Installation is easy – just navigate to the ZwiftPower ZRS page for your browser (Chrome, Edge, or Firefox) and click to add it to your browser. Done! It will automagically function when viewing event results on ZwiftPower.
Usage
Visit any event results page on ZwiftPower to see the extension at work. Here’s one such page, the results for a race I wrote about losing just this week.
ZwiftPower ZRS adds a “ZRS” column to the results, as shown below:
The number in black is the ZRS result for the race, while the smaller superscript number tells you how much the rider’s score changed with this result.
If a rider’s score increased due to a power PR that resulted in a seed score boost, you’ll see an upward arrow ⇡. You may also see an up tack ⊥ next to the score, which indicates that the rider’s ZRS floor has been reached.
From the Creator
I reached out to the creator of ZwiftPower ZRS, who prefers to go by the nickname “int” for online anonymity. Here’s what they shared:
The project started when I noticed Sauce4Zwift showing ZRS scores in their app. At the time, it was a feature the racing community was really missing. I thought it would be great to have the same thing directly on ZwiftPower – the one website every racer already uses – so there’d be no need to check anywhere else just for ZRS.
Curious how they managed it, I checked their source code and discovered that ZRS data is actually accessible via the official Zwift API. The problem: even though I’m a software engineer, I had never built a browser extension before and barely knew JavaScript. Still, I figured someone had to do it (hence my nickname SomebodyHasToDoIt in the webstore). So I dove in, looked things up, and with a bit of AI help had a basic version working in about 3 hours.
I uploaded it to the Chrome Web Store, and while it was under review, I shared the source code in the Zwifties Discord #nerd-corner to gather feedback. A few people there offered great suggestions, which I quickly implemented.
Since then, the extension got approved and has only needed small fixes. I never promoted it anywhere, yet word spread – and today it’s used by around 200 people each week.
I’ve had requests to add more features (like a ZRS history graph), but I hesitated because of rumors that Zwift might replace ZwiftPower. Looking back, I kind of regret not expanding it further for the community – maybe your post will give the project new life.
Two quick facts:
- First released: Feb 16, 2025
- Privacy: No data collection, analysis, or tracking
Feature Requests for Zwift
We could discuss potential improvements to the ZRS algorithm all day long, but for this post, I want to stay focused on what the ZwiftPower ZRS extension does: make it easier to view ZRS information.
A ZRS column should already be built into ZwiftPower, of course. This extension, like other brilliant community projects over the years, just adds functionality Zwift should have already built!
I would also love to see the score change number showing up on the event results page at zwift.com as well (for example, at zwift.com/events/view/5061096).
And my bigger ask – which Zwift has said is coming – is some sort of historical view of a rider’s ZRS, as int mentions above. I want to see how my score has tracked over time, and I want to see that for others as well. Please make it so, Zwift!
Questions or Comments?
Have you used this browser extension? Would you like Zwift to make ZRS information more available, and if so, how specifically? Share your thoughts below!
