Blind-spot finder for your decisions: a 3-hour PromptWars solo build, vibe-coded with Google Antigravity
Perspectra is a structured-thinking tool that finds blind spots in your reasoning: it surfaces unstated assumptions, overlooked factors, and internal contradictions — exploring, never deciding for you.
It was built solo in 3 hours at PromptWars (Google for Developers x Hack2skill, 2026-10-04), a hackathon format where "participants build vibe-coded solutions with Google Antigravity or Google AI Studio within limited time" (author's PROMPTWARS.md). AI score 90.28/100, ranked 45 of ~300, and the author kept iterating after the event. Stack: Next.js App Router + TypeScript, Gemini API, Firebase Auth, Firestore, Vercel (all author-stated); built with Google Antigravity (author-stated).