Today, we are opening the source code of the Zepra browser engine. You can now access the full repository on GitHub at KetiveeAI/zepra and visit our official website at zepra.ketivee.com.
The journey of Zepra started back in 2023. At the time, development had to be paused due to financial issues and our team's personal health struggles. But the vision never faded. We picked the project back up in 2024, focusing initially on laying down the architectural structure. We realized that our operating system needed a dedicated JavaScript engine, and we didn't want to rely on V8—it's notoriously resource-hungry. We needed to control our own ecosystem to ensure our OS runs smoothly and, most importantly, to guarantee that user data remains completely secure without any privacy compromises.
In December 2025, we fully reopened the project. During a highly productive 15-day sprint, we wrote a massive amount of code, building out the foundational structures for ZepraScript and the basic UI that you see in the screenshots today. Unfortunately, development had to pause once again as our team members dealt with severe back pain and spinal cord issues.
Now, in March, we are back at it with full force. Despite ongoing health challenges, we recently pushed a massive first commit of 35,000 lines of code—the culmination of a month's worth of local development. This week alone, following intense 16 to 18-hour daily work sessions, ZepraScript has finally crossed the 200,000 lines of code milestone. The engine is rapidly stabilizing, and over the next few weeks, we are actively working to make it ready for all of your devices.
Zepra was built to be a fast, independent browser engine. By publishing the codebase, we want to give developers a clear and transparent view into how it runs under the hood. It’s easy to look at a browser and take it for granted, but under the surface, it’s one of the most complex pieces of software you can build. We know there will be bugs, missing features, and edge cases we haven't even thought of yet. But that's exactly why we're building this in the open.
Let's build Zepra together. Thanks for reading, and we are incredibly excited to see you on our GitHub. Let's build a new web!
