# Clock84 — Free Online Retro Clock & Time Tools

> Clock84 is a free, account-free, browser-based retro seven-segment LED clock and timing tool suite, created by Arcana Synthetica (Harlingen, the Netherlands).

## Tools
- [Live digital clock](https://www.clock84.com/): local clock, blinking colon, 12/24-hour mode and fullscreen.
- [Online stopwatch](https://www.clock84.com/stopwatch.php): lap and split timing, CSV export.
- [Countdown timer](https://www.clock84.com/timer.php): custom durations, presets, pause and sound option.
- [World clock](https://www.clock84.com/world-clock.php): compare cities and time zones, daylight-saving awareness.
- [Browser alarm clock](https://www.clock84.com/alarm-clock.php): named, repeated or one-time alerts, snooze and notifications when permitted.
- [Online chess clock](https://www.clock84.com/chess-clock.php): configurable two-player clock, Fischer increment, US delay, Bronstein delay, hourglass, custom controls and keyboard shortcuts.
- [Chess time control guide](https://www.clock84.com/chess-clock-guide.php): explanations and examples of chess timing methods.

## Studio and support
- [Arcana Synthetica](https://www.clock84.com/about.php): creator and background.
- [Studio projects](https://www.clock84.com/projects.php): product portfolio.
- [Contact](https://www.clock84.com/contact.php): feedback and support contact form.
- [Privacy](https://www.clock84.com/privacy.php): browser storage, alarms and contact messages.
- [HTML site map](https://www.clock84.com/site-map.php) · [XML sitemap](https://www.clock84.com/sitemap.xml)

## Product family (external websites)
- https://notadirect.nl/ — NotaDirect, free invoicing and business utilities.
- https://babyphone.online/ — Babyphone.online, web-based baby monitoring.
- https://droptophone.com/ — DropToPhone, device-to-device file transfer.
- https://arcanaprofile.com/ — Arcana Profile, non-diagnostic personal self-reflection tool.

## Expanded machine-readable overview
- [Complete description, FAQs, limitations, company and product details](https://www.clock84.com/llms-full.md)

## Important limitations
- Browser alarms are not guaranteed when the tab is closed, the device sleeps, or background execution is blocked.
- Time accuracy depends on the user's device clock and browser time-zone data.
- Clock84 is not an official competition-certified chess clock.
- No account is required for the time tools; contact form submissions are transmitted by email when configured.