Hand off files. Know they arrived.
PX bundles files into a .pack — with notes, structure, and cryptographic proof that nothing was changed.
Your recipient opens it in a browser. Everything is clear.
No account. No server. No install. Works offline.
Every file gets a SHA-256 hash. Every hash goes into a manifest. The manifest gets its own hash — the pack_id。
Change one byte in one file, and pack_id changes.
PASS means every byte matches. FAIL means something changed. There is no maybe.
Binary + SBOM + provenance + signature. Today these are in 4 places, verified by 4 tools. Most don't bother.
PX puts the entire release in one .pack. One drop. Every hash checked. No CLI on the receiving side.
Resolution: 16 seconds. Faster than your AI assistant.
The hash doesn't lie.
Files and context, sealed together. Your recipient sees the note before the files. The structure tells the story.
Don't trust the vendor. Trust the math.
The .pack is the proof. It outlives the vendor.
PX is free.
PX at its smallest. 15KB of HTML.
A browser and this file — that's all you need to verify a pack. No network. No install. Works in air-gapped environments.
Outer: 1.8px. Inner: 0.4px. Gap: 6px.
These three numbers took three days.
One line didn't look like a seal.
Two lines felt heavy.
Different weights made it a seal.
FAIL is one line. No inner ring.
FAIL means something is missing.
Cormorant Garamond — headings.
To respect books.
DM Sans — body.
A tool shouldn't draw attention to itself.
JetBrains Mono — hashes.
There are maybe three fonts where sha256:a3f2... is readable. This is the quietest.
Japanese edition uses Shippori Mincho.
The feel of an Iwanami Bunko colophon.
Reason: "It's calming."
That is the entire design theory.