Vintage postal notebook opens a language-learning app
156.5K views · 701 likes · 660 saves · 41 reposts · Posted Sep 22, 2026 · 0:26 · Interactive
OUR NOTEA Spanish-language letter book stamped "Sevilla 1928" sits over a stack of review cards in Letters Abroad, an AI pen-pal app whose 3D models and transitions the creator credits to Opus 5.5.
Forget threejs demos, Opus 5.5 is *incredible* at building apps.
This is Letters Abroad, a language-learning app I'm working on. You exchange letters with an AI pen pal, and learn a language through context (plus some brain science magic).
http://lettersabroad.app (also built by Opus, of course)
I've been tinkering with this the last week. I built a prototype with Astra, but wasn't happy with the design. Tried Fable, still wasn't good enough. Then Opus 5.5 dropped. In a few hours, I've made more progress on the visuals than in a week of burning tokens.
This model is insane. It reads my mind and nails it every time. All the gorgeous 3D models and fluid transitions are thanks to Opus. Crazy idea, prompt, repeat. No more quota anxiety, just non-stop flow state.
I'll be writing about my prompts/skills/learnings from building this. Lots to share; this generation of models is absolutely game-changing for design!THE PROMPT
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Indexed Sep 28, 2026, 8:28 AM · Views as of indexing. Video and post © their creator.