Doctor on Demand announced on Wednesday a desktop browser version of its video service for on-demand doctor’s visits. The company has also closed a $21 million Series A funding round and signed a partnership with Comcast that will offer the cable company’s employees free access to the service. Previously, patients could take appointments on iOS and Android. The new Web version is optimized for Chrome on Mac and PC. Check-ups cost a flat fee of $40 and last roughly 15 minutes. All of Doctor on Demand’s physicians are board-certified for the state they’re taking calls in. The service is 24/7 in most US states, but a few regions might have off hours on a Sunday night or other non-peak times. Of course, not every medical issue is suitable for a video call with a doctor.