Fable vs Opus
Test 02·Medium

FablevsOpus
The focus room

A one-shot UI build. Both apps below are live and fully working: start the timer, add tasks, switch themes.

Same promptWord for word, sent unedited to both.
Fresh chatsNo history, no custom instructions.
Both on HighClaude Fable 5.2 High and Claude Opus 5.5 High.
First answer onlyOne shot. No retries, no follow-ups.
The prompt, word for word
Build a "focus room" web app in a single HTML file: a Pomodoro timer that feels calm and premium enough that someone would leave it open all day.

Must have:
- 25/5 minute focus/break cycles with start, pause and reset
- A large, satisfying timer visual that shows progress, not just numbers
- A short task list: add, check off and delete tasks
- A daily streak counter that persists after refresh
- Light and dark mode
- Works well on both desktop and mobile

Design it like a real product you'd pay for. No external images. One shot: give me the complete file.
Fable 5.2 HighOpen full screen
  • Named it Stillroom: brass light while you focus, cool window light on breaks.
  • Breaks start on their own; the next focus session waits for you, so an idle tab can't fake your streak.
  • No external files at all. Works offline.
Opus 5.5 HighOpen full screen
  • A full dashboard: sessions, minutes focused, current and best streak, a 7-day chart.
  • Auto-continue, desktop notifications and the countdown in the tab title.
  • Sage accent while focusing that shifts to clay on breaks.