Many open source PVR software packages do this for free (Mythtv, SageTV). If you want better guide data, Schedules Direct is $25/year. I've been using SageTV

Many open source PVR software packages do this for free (Mythtv, SageTV). If you want better guide data, Schedules Direct is $25/year. I've been using SageTV (which was the foundation of the Google Fiber TV DVR) for 10 years since before Google bought them an open-sourced it. Between SageTV, Netflix, and ad-blockers, my son has basically never seen a commercial.