phase : 1
spec : v0.2 — published, CC0
core : subtext-core — published, MIT
iOS app : in development — TestFlight TBA
site : prospectorlabs.dev/subtext

# ⌬ subtext

A protocol that lets ordinary text carry structured data, invisibly. Copy-paste becomes a transport. No file, no link, no API key — the message is the payload.

## How

Unicode Variation Selectors (256 codepoints across U+FE00–U+FE0F and U+E0100–U+E01EF) map one-to-one to byte values. By appending VS sequences to a cover string, arbitrary bytes ride along as invisible characters.

## Where it works

Verified on Slack, X, TikTok DM, iMessage, and LINE.

## Open layer

The protocol spec (subtext-spec) is published under CC0. The reference library (subtext-core) ships MIT. The iOS app sits on top.

• subtext-spec  — protocol specification (CC0)
• subtext-core  — reference library, TypeScript (MIT)

First public documentation of LINE's word-wrap behavior and the grapheme-distribution workaround:

LINE drops the 31st invisible character  (Japanese)

Read the spec, build on subtext-core, ask for early access to the iOS app, or talk integrations:

[email protected]

x.com/subtextprotocol  — updates

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