A peer-to-peer alternative to the three-tier stack

Letters, not servers.

Souspli replaces pages a server renders for you with signed letters people send each other and keep. One file, complete and verifiable, opened in a container that cannot phone home.

Download Souspli Why this exists

macOS, Windows, Linux · experimental alpha · unsigned builds · what works and what does not

The Souspli app. On the left, a feed of letters listed by who signed them and what each calls itself. On the right, a news article open under a header that reads: signed, by Grace Hopper, you vouched, 5 attestations. — The real app, on a populated library. The strip above the article belongs to Souspli, not to the letter: it says who signed it, that you vouched for them, and that five people have attested to it.

A letter is one object

Self-contained	No external fetches. Every image, font and byte of video travelled with it.
Readable	One file of HTML. Open technologies, plain markup, openable for as long as browsers exist.
Immutable	Identified by the hash of its content. A correction is a new letter, never a silent edit.
Attributable	Signed by its author. The signature covers the program, the content and every attachment.
Sealed in	Interactive, but with no exit: no network, no cookies, no way to report on its reader.

What people build from it

An article you can keep. An invitation. An invoice that references the order it settles. A contract with four independent signatures, held in full by everyone who signed. A club with a roster — and a forum with threads, votes and moderation that nobody hosts, where two readers see the same posts in a different order because each ranks by the people they trust.

Two models, side by side

	Three-tier service	Souspli
System of record	The operator's database	The copy in each party's hands
What you receive	A rendering, valid for one session	A file, valid indefinitely
Who sets the rules	The application tier, changeable at will	The terms written into the document
Same content for everyone	No, and not verifiably so	Yes, by content hash
Archiving	Screenshots and scrapers	Copy the file
Leakage from the client	Dozens of third-party connections	None; the container has no exit

Read at the depth you want

Why
What is wrong with the web's shape, and what a letter fixes. Compared with Nostr, Mastodon, IPFS, PGP.
Use
Write and send a letter, run a forum, sign a contract together, decide whom you trust.
How
The format specification, the architecture, the threat model and the escape suite.
Next
Private letters, key rotation — and zero-knowledge membership, secret ballots, identity proofs.

The exchange of documents between free people is how we operated for centuries — and we have more than enough bandwidth to go on doing it.