Last updated: July 2026
Free, no-signup timezone tools for distributed teams.
TimeSyncis a free timezone overlap planner. Add your team members by city, pick a date, and the planner shades each person's working day on a shared 24-hour timeline. The highlighted band shows exactly where everyone's hours overlap — no arithmetic required.
Share links encode your full team configuration in the URL so colleagues can open the same view without creating an account. The standup rotation planner finds the least-painful recurring time and generates a rotation so no region always takes the awkward slot. The city pairs directory provides pre-computed overlap facts for 300+ common city combinations.
Working-hours model. Each person has a configurable work window (default 9 AM–5 PM local time). The planner computes overlap at 5-minute resolution across all team members simultaneously. A slot is highlighted only when every person is within their stated working hours.
Pain scoring for standup rotation. When no perfect overlap exists, the standup planner scores every half-hour slot across the team. Each person receives one of four labels for a given slot:In hours (score 0), Early (score 1), Late (score 1), or Asleep(score 3 — any hour before 7 AM or after 10 PM local). The slot with the lowest total score is recommended first. The rotation generator then finds one slot per team member where that person's region is “in hours,” spreading the inconvenience fairly.
IANA timezone data via Luxon. All UTC offsets and DST transitions are computed at runtime using the Luxon library, which bundles the IANA timezone database. Offsets are evaluated at local noon on the selected date rather than midnight to avoid edge cases around DST transitions. Half-hour zones (India, UTC+5:30) and 45-minute zones (Nepal, UTC+5:45) are handled natively. Pair-page overlap figures are computed at build time for the build date; use the interactive planner for any specific future date.
Distributed engineering and design teams, remote-first companies coordinating across regions, freelancers scheduling calls with international clients, and anyone who has ever mentally converted time zones at 11 PM and gotten it wrong.