Built for teams that
live in different clocks
Overlap is a free visual timezone grid. Add up to 10 cities, drag the slider, and find the green zone where everyone is awake. No signup, no account, no tracking — just instant clarity.
Every remote team goes through the same ritual. Someone opens a timezone converter, types a city, gets a time, opens a new tab, types another city, does mental arithmetic, makes a mistake, starts over. For 10 cities it takes 5 minutes and still feels uncertain.
Standard timezone tools are built for converting one time between two places. They're not built for the actual question remote teams ask: "When is everyone awake at the same time?"
Overlap is built for that question. You see all cities simultaneously, coloured by status, and the answer is visual — green columns are where everyone overlaps. No arithmetic. No tabs. No mistakes.
- Colour-coded 24-hour grid — red for sleeping, amber for early/evening, green for working hours
- Automatic overlap detection — finds windows where your entire team is in working hours simultaneously
- Smart recommendation — when no full overlap exists, scores every hour and picks the best-effort slot
- Meeting card — click any column to see everyone's exact local clock for that UTC hour
- Copy invite — one click generates a ready-to-paste announcement for all cities
- Google Calendar export — opens a pre-filled event for the selected meeting time
- Customisable slots — edit what counts as "work", "early", or "night" for your team's schedule
- Shareable URLs — city selection is encoded in the link, send it to anyone
- DST-aware — handles daylight saving transitions via the browser's native Intl API
- Works offline — no server calls after the page loads
Overlap is a single HTML file with no external JavaScript dependencies. All timezone logic uses the browser's native Intl.DateTimeFormat API, which handles daylight saving time, UTC offsets, and locale-specific formatting automatically.
- Remote engineering teams — scheduling standups and sprint planning across 3–8 timezones
- Global freelancers — finding client call windows without 5 minutes of tab-switching
- Gaming guilds — coordinating raid times for members on 4 continents
- International podcasters — booking guests across opposite sides of the world
- Open source maintainers — scheduling contributor calls for globally distributed projects
- Crypto and DeFi teams — 24/7 markets, teams in Tokyo, London and NYC all need to talk
Overlap is intentionally a single-purpose tool. It does one thing well: shows a 24-hour colour grid so you can find when your global team overlaps. It will never require a login for core features, never sell your data, and never add complexity that gets in the way of that one job.
The entire application is a single HTML file you can download, inspect, and run locally forever. No lock-in. No servers to break. No accounts to delete if you want to leave.
Overlap Timezone is an independently run, self-funded project — not backed by a company or investors. It is maintained on an ongoing basis: timezone and daylight-saving rules are updated as regions change them, the city database is expanded when users request missing cities, and the guides in our blog are revised as remote-work practices evolve. Each article shows its last-updated date.
Questions, corrections, bug reports, or licensing enquiries are welcome at hello@overlaptimezone.cc — we aim to reply within 48 hours. For full contact options see the contact page, and for how we handle data see our privacy policy.
- Frequently asked questions — how the tool works, DST handling, sharing, and privacy
- Use cases — how engineering teams, freelancers, gaming guilds, and educators use Overlap
- Blog — guides on scheduling across US–Europe, Asia-Pacific, DST changes, and async-first remote work
Open the app and add your cities. It takes 30 seconds.