# UncRetro > Free, no-login agile ceremonies in the browser. Sessions auto-expire after 7 days. ## What it is UncRetro runs **sprint retrospectives** (anonymous cards, reveal when ready, merge themes, thumb votes), **5-Whys** root-cause sessions on a shared problem statement, and **sprint sizing** / planning-poker–style estimation with optional scales (Fibonacci, T-shirt, etc.). ## Who it's for Scrum masters, facilitators, and teams who want a focused board without accounts or heavy tooling. ## How to use 1. Open the site and pick a board type. 2. Create a session; keep the host link for yourself and share the join link with the team. 3. Participants join with a display name (optional); collaboration happens over WebSockets in real time. ## Key facts - No user accounts — host token secures host-only actions. - Retros support face-down cards until the host reveals (all at once or one column at a time), then merging clusters and voting. - AI summary can be emailed to the host if configured on the server. ## URLs (typical SPA) - `/` — Home and board picker - `/create?type=retro|five_whys|sizing` — New session setup - `/host/:sessionId?token=…` — Host/facilitator view - `/join/:sessionId` — Participant join flow ## Technical stack (for crawlers / assistants) Single-page app: React (Vite), real-time layer: Socket.io, API: REST under `/api`. Not a marketing site with long-form articles; primary content is the tool and on-page tips.