CastKeeper

CastKeeper is a podcast archiving application aimed at individual listeners who want to preserve podcasts they care about. It addresses the problem of podcast content disappearing when hosting platforms shut down, creators delete episodes, or RSS feeds expire, by letting users store permanent, personal copies of the audio and video content. The open-source version is self-hosted via Docker and supports multiple file storage backends, while an Apple-platform version offers a consumer app experience.

Beyond preservation, CastKeeper transcribes and indexes episode content so users can search for specific topics discussed within their archived podcasts. The Apple-focused version adds AI capabilities powered by Apple Intelligence, including Siri integration, on-device episode summaries, automatically generated chapters, taste profiling, and personalized discovery, all processed without cloud tracking or data mining. It also includes a directory of podcast hosts with links to their social media and websites.

CastKeeper serves individual podcast listeners, archivists, and privacy-conscious users who prefer one-time ownership over recurring subscription services. The self-hosted open-source project is distributed under the GNU Affero General Public License and built with Go, JavaScript, and related web technologies. A separate related project by a different developer offers a Cloudflare Worker tool for backing up Pocket Casts listening data, though this is a distinct, unaffiliated tool.