§ Case 07 — AI Workspace · Editorial
HalcyonOS2027
A serene AI-first workspace for writers. Predictive outlines fade in like ambient mist; commands surface contextually instead of through menus.
Year
2027
Role
Product Design
Stack
Next.js · OpenAI
Case 07 · 2027
AI Workspace · Editorial
01 · Brief
Halcyon OS — brief
Most AI writing tools yell. Halcyon wanted to build the opposite — a workspace that quietly proposed an outline as you typed, surfaced commands when you needed them, and got out of the way the moment you started writing the next paragraph.
02 · Approach
Approach
Predictive outlines fade in at 14 % opacity if the cursor pauses for over 800 ms; they vanish the moment you keystroke. Commands surface contextually — type 'tone:' anywhere and the AI tone palette opens; everything else is hidden until needed.
03 · Solution
Solution
A single editor surface with a single keyboard shortcut (`/`) for everything else. Drafts auto-version every 60 seconds; the side panel is a timeline of versions you can scrub through with arrow keys. Sync is local-first via Y.js + tRPC mutations.
◊ Gallery
Selected frames
Click any image to enter the lightbox. Use ←/→ to step through, Esc to close.
◊ Numbers
1.2k
Beta writers
71%
W8 retention
14%
Predictive opacity
60 s
Auto-version
◊ Deliverables
- 01Local-first editor (Y.js CRDT + tRPC sync)
- 02Predictive-outline pipeline (debounced GPT-4 mini)
- 03Contextual command palette (`/` and `tone:`)
- 04Drafts timeline with keyboard scrubbing
- 05AI tone library — 12 calibrated voices
- 06Marketing site, docs, and pricing page
04 · Outcome
Outcome
Private beta with 1 200 writers across publishing, journalism, and fiction. 71 % weekly retention at week 8 — well above the 30 % industry baseline for AI tools at this stage.
It is the first AI writing tool that lets me forget I'm using AI. The outlines just appear when I want them.
◊ Stack
Next.js
OpenAI
tRPC
Drizzle