I built an AI-powered video speed controller for online courses

A developer built CourseSpeed, a Chrome extension that provides granular video speed control across multiple online learning platforms including Udemy, Coursera, LinkedIn Learning, and Skillshare. The extension was created after the developer struggled with inconsistent speed controls while taking 12 online courses in three months. CourseSpeed is based on research by Murphy et al. (2022) showing that 2x speed causes no significant learning loss.

I was taking 12 online courses in 3 months. Python, machine learning, web development — all while working full-time. Every platform had a different video player. Udemy's speed control had 4 steps. Coursera's shortcuts were different. LinkedIn Learning didn't remember my settings. I was spending more time fighting the players than actually learning. So I built CourseSpeed. CourseSpeed is a Chrome extension that gives you: Chrome's MV3 migration is painful but worth it. Service workers replace background pages, and the new API surface takes time to learn. Course platforms don't want you to control speed. Most of them strip or override custom speed controls. Getting CourseSpeed to work across Udemy, Coursera, LinkedIn Learning, and Skillshare required per-platform DOM manipulation strategies. Science backs this up. Murphy et al. 2022 found 2x speed causes no significant learning loss. Watching a lecture twice at 2x produces better retention than once at normal speed. I built CourseSpeed on this research — not assumptions. CourseSpeed just launched on Product Hunt and has active users on the Chrome Web Store. The most requested feature so far: per-platform speed presets already built . If you take online courses and want to learn faster without losing comprehension, try it out: 👉 https://joycraft.dev/coursespeed https://joycraft.dev/coursespeed Ask me anything about building Chrome extensions, the MV3 migration, or the science of video speed learning.