Invidious is an alternative front-end to YouTube. Audio-only mode (and no need to keep window open on mobile). Free software (AGPLv3 licensed). No ads. No need to create a Google account to save subscriptions. Lightweight (homepage is ~4 KB compressed). Tools for managing subscriptions: Only show unseen videos. Only show latest (or latest unseen) video from each channel. Delivers notifications from all subscribed channels. Automatically redirect homepage to feed. Import subscriptions from YouTube. Dark mode. Embed support. Set default player options (speed, quality, autoplay, loop). Does not require JS to play videos. Support for Reddit comments in place of YT comments. Import/Export subscriptions, watch history, preferences. Does not use any of the official YouTube APIs. Developer API.