Meridian is the reference desktop client for the MMSP protocol and its MFEED JSON feed format: a modern, structured alternative to RSS. Full support for RSS, Atom, podcast and YouTube feeds included for backwards compatibility.
MMSP (MultiMedia Subscription Protocol) is a modern, open standard for feed subscription: structured, JSON-native and designed for clarity where RSS/Atom have accumulated decades of cruft. MFEED is the JSON feed format that implements it.
Meridian is the reference desktop client: it parses MFEED natively, enforces MMSP polling semantics (conditional GET, 300 s floor, MMSP/1.0 User-Agent) and applies MMSP Appendix A ABNF filter expressions per-feed. RSS, Atom, podcast and YouTube support is included so you can subscribe to everything in one place while MFEED adoption grows.
Why this exists Read the MMSP SpecificationThe detail lives on focused pages instead of one long scroll.
Everything included, from discovery and filters to full keyboard navigation, plus the architecture a reference client demands.
The reasoning behind the reader and the protocol, distilled.
The release history: the newest reports every import and fetches no picture or media over plain HTTP. Before it, redirects to plain HTTP were refused before they are made, Check for Updates found its home in the Help menu, a Guide to every button arrived behind it, the front end split into components, every keyboard ring proven by real key presses and the installer brought under the same coverage requirement as the application.
Native installers for Windows, macOS and Linux. Free, local-first, no account and no sync.
Meridian is free and stays free. There is no paid tier, no licence key and no feature held back behind a donation. If it has replaced something you were paying for or simply saved you an afternoon, a contribution supports its maintenance and continued development. The same link sits at the foot of the app's own window.
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