Syntheos.

Won the TPIA award at the Brainrot jia.seed hackathon, built with a team of three. Paste a draft social post and Syntheos returns an honest score, the specific lines that are weak, and three finished rewrites tuned to the platform you’re posting on. After the hackathon I rebuilt it properly: Gemini now returns schema-validated JSON instead of markdown, so a malformed response degrades into a sparse result instead of a crash; the draft is passed as user content, so a post containing “ignore your instructions” is treated as data; history moved from a single Firestore document to a paginated collection with a one-time migration; and auth runs on a proper loading / signed-in / signed-out state machine. Users can also track score trends per platform.