FAULTLINE — a blind, anonymous group review tool that exposes red flags before a plan gets locked in.
by rookepoole
Voted by ₥AN$A, Air Planes, Auny 🧡, rookepoole
A host creates a room and adds a plan manually or imports a PDF, DOCX, TXT, Markdown, CSV, JSON, HTML, or RTF document. FAULTLINE breaks the plan into reviewable sections and shares them with separate no-sign-in guest profiles over WebRTC. Everyone reviews independently and anonymously, flagging specific sections with severity, concern type, and an optional explanation. Crucially, nobody sees anyone else's concerns during review, preventing the first objection from anchoring the group. Once everyone is ready, the host reveals the results and FAULTLINE ranks the plan's real fault lines by anonymous reviewer count, severity, and section.
- Models
- GPT-5.6 Sol
- Cost
- Built in ChatGPT. Exact token usage and per-build API cost were not exposed.
The main design challenge was making this meaningfully different from anonymous comments. I landed on a blind-review → simultaneous-reveal mechanic so participants can't influence each other's concerns before committing their own judgment. Technical issues included realtime state synchronization over WebRTC, persistent no-sign-in guest identities, reconnects, and document importing. I used persistent browser guest IDs, a host-authoritative WebRTC state model, reconnect handling, and client-side document parsing. I also found an edge case where a peer joining could overwrite the host's imported draft, so I changed the state merge logic to preserve the host's working document until review begins.
1 comment
Auny 🧡 9/4/2026, 2:43:53 AM
My fave one you built!!