Field notes, evals, and stories from building the no-code app builder that turns a sentence into a working app.
Every deployed Vibe serves both a live screenshot and its own source. That closes a visual feedback loop an agent can run alone — see the app, fix the code, push, look again — and fan out across dozens of apps at once.
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Every edit to the system prompt changes every app anyone generates. Here's the harness that measures generation quality — 46 prompts in three sets, scored 1–5, fanned out across a Workflow pipeline — so we know within a coffee break whether a change made things better or worse.
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We tried to recreate Pickathon's built-out 2026 app — data model, views, and a fiddly access policy — from a single plain-English prompt. It got ~90% there on description alone; a URL and a one-sentence schema closed the rest.
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