What shipped, and when.

Phase status

Log

• 2026-09-23

  First TestFlight build

  The Swift app exists. Build 4 is a bare SwiftUI chat screen with a placeholder icon, signed and uploaded to TestFlight straight from the build machine with no one opening Xcode. It does nothing useful yet. What matters is the pipeline: from here every change can reach a phone in minutes. First upload was rejected for a missing app icon, fixed in one commit.
• 2026-09-23

  Waitlist open

  The waitlist is live on yuigui.com. Sign up for TestFlight invites and occasional updates. Signups land in a small table in PostScarcity AI's existing database, no new infrastructure.
• 2026-09-23

  Apple Developer account active

  Yui has an Apple Developer account, so TestFlight is unblocked. Xcode is installing on the build machine. Next: the Swift project and an automatic TestFlight build on every push.
• 2026-09-23

  yuigui.com is live

  The hub now lives at yuigui.com. Yui is built in public: this log updates as work ships, and a weekly update lands every Friday.
• 2026-09-23

  Stack decision: all Swift

  Yui will be a native SwiftUI iPhone app, not React Native. The reason is the product: Yui should feel like part of the phone, and the features that set it apart (a workout timer on the lock screen, Siri and the Action button, Apple's on-device model and speech) are native Apple surfaces. The preset design keeps the app small, so an Android port later is a port of the presets, not a rewrite. No Apple Watch app yet. Yui Lines stays platform-neutral: the web playground and the Swift app parse it the same way.
• 2026-09-23

  Source on GitHub

  The hub, roadmap, Yui Lines spec and benchmark now live at postscarcityai/yuigui. The app code gets its own repo, yui.
• 2026-09-23

  Yui Lines v0: spec, 12 presets, playground, token benchmark

  Agents now speak Yui Lines: one short line per component, no UI code, no JSON. Spec at /yl, live playground at /playground with all 12 presets (timer, ask, choose, pick, slide, form, list, table, card, image, camera, mic), line-by-line streaming, ~patch, >screen routing, save/show and the custom {json} escape hatch. Benchmark on 10 screens with real tokenizers: YL is 1.6x smaller than minified JSON, 2.7x smaller than pretty JSON, 3.9x smaller than a component-tree document.
• 2026-09-23

  Hub site live (Phase 0)

  This site: overview, roadmap, progress log, business plan draft, pitch deck, three phone mockups. Deployed to Vercel as project yui. yuigui.com not attached yet.
• 2026-09-23

  Roadmap v1

  Six phases written from the pitch. Stack call: JSON UI protocol, Expo app, Cloudflare relay, Hermes connector. Arnold is the first agent wired in.
• 2026-09-23

  Pitch recorded and transcribed

  Chris recorded a 21.6 minute pitch (rec 366). Transcribed locally with Whisper and summarized. The name settled on Yui.