How it works
Quiet, and yours.
Plinth is a marketplace, a wallet, and a reader. They're each deliberately small. Here's the whole flow, from sign-in to a book on your shelf.
- 01
Sign in with AthID.
AthID is your identity across the Athenium network — one login that works on Plinth, on Athenium-Marketplace, and on any other service we or our partners run. Sign up once, sign in anywhere.
- 02
Choose a book.
Every book on Plinth carries a real price, a real publisher, and real ownership. No subscriptions, no tiers, no algorithmic feed. Just a library.
- 03
Make it yours.
Check out with your card — same secure payment you use everywhere else. Once payment clears, the book is yours: not a licence, not a stream, not a subscription that lapses when you forget to renew.
- 04
Read in the Plinth app.
Open your book on phone or tablet. Highlights and notes are yours and travel between devices. No connection required after the first download.
- 05
Keep it forever.
If Plinth ever shuts down, your books and annotations come with you. That's the whole point. Ownership shouldn't end when the platform does.
A few things worth knowing
Plain answers.
- What format are the books in?
- Plinth uses its own format — Ath Package — for everything we sell. The Plinth reader app opens these natively. We don't use formats from other stores because they were designed to lock readers into their own apps.
- What happens if Plinth shuts down one day?
- The books and notes you've bought stay yours. Ownership lives with you, not with our servers — even if we stop running tomorrow, your library and annotations come with you. We think this is the whole point.
- Can I read on my computer?
- Right now, no — Plinth is a phone and tablet experience. A desktop reader is on the list, but not built yet. We'll be honest when it changes.
- Who publishes on Plinth?
- Independent publishers we've invited, plus self-publishing authors who go through Athenium's publisher Studio. We're small and particular by design.
That's the whole shape.