## Feature 004: Use the app without sign-up

**Sources:** use-the-app-without-accounts-or-sign-in, data-persists-correctly-when-app-closes-and-reopens
**Personas:** knowledge worker trying to protect deep work time, student managing study sessions, casual timer user
**Stack span:** full-stack
**Tier:** v1

**Description:**

Start a session immediately on first visit. No accounts, no friction. The user gets value before they've even decided they like the app.

**Constituent tickets:**
- use-the-app-without-accounts-or-sign-in
- data-persists-correctly-when-app-closes-and-reopens
