I built a small, MIT-licensed app to end ad‑hoc "when are you free?" timezone discussions for cross-TZ teams. Heavy scheduling tools already exist, but for quick overlap checks they’re overkill.
This app shows a 7×48 weekly grid (30‑minute slots). You click to select availability, then share a single URL. The viewer sees your ranges in their own timezone, and the app keeps a "sender timezone" badge for context.
Highlights:
- Ad‑hoc, zero‑signup flow (state in URL)
- Timezone‑aware display (detected vs. sender)
- Half‑hour slots, overlap checks, range preview + delete
- DST‑safe (Intl‑based) without external date libs
- MIT licensed