# Clock84 — Complete Product & Studio Information

> Official descriptive reference for Clock84, a free browser-based retro LED clock and time-tool suite by Arcana Synthetica. This document is provided to help users, search engines and AI-assisted discovery tools understand the site's real functions. It does not claim to influence or guarantee ranking or citations.

**Last substantive revision:** 2026-10-29  
**Product:** Clock84  
**Creator:** Arcana Synthetica  
**Language of the website:** English  
**Location of studio:** Harlingen, Friesland, the Netherlands  
**Website:** [Clock84 homepage](/)  
**Primary source of truth:** the actual features and instructions visible in the web application.

## What is Clock84?

Clock84 is a free website that combines a retro digital LED clock with practical timekeeping tools. Its visual identity is based on red seven-segment numerals, subtle dark LED joins and a brushed-metal clock face. The application runs in a modern browser without installing an app or creating a user account.

**Main functions:** live digital clock, online stopwatch, countdown timer, world clock, browser alarm clock and configurable two-player chess clock.

## Main website pages

| Page | Purpose | Link |
|---|---|---|
| Home / Clock84 | Live time clock and instrument dashboard | [Open clock](/) |
| Stopwatch | Timing with laps and split records | [Online stopwatch](/stopwatch.php) |
| Countdown Timer | Countdown with presets and custom durations | [Online timer](/timer.php) |
| World Clock | Comparing current times in multiple cities | [World clock](/world-clock.php) |
| Alarm Clock | Browser reminders with repeat and snooze | [Alarm clock](/alarm-clock.php) |
| Chess Clock | Two-player game timer with multiple time controls | [Chess clock](/chess-clock.php) |
| Chess Time Control Guide | Educational explanation of chess clock timing modes | [Chess guide](/chess-clock-guide.php) |
| Studio | Who makes Clock84 | [About Arcana Synthetica](/about.php) |
| Portfolio | Other tools by Arcana Synthetica | [Projects](/projects.php) |
| Contact | Product questions, support and feedback | [Contact form](/contact.php) |
| Privacy | Local storage, alerts and hosting/contact information | [Privacy statement](/privacy.php) |
| HTML sitemap | Human-readable complete navigation | [Site map](/site-map.php) |

## Detailed feature descriptions

### 1. Free online digital clock

- Real-time device-local clock with large red LED-style seven-segment digits.
- Blinking colon separators synchronized with seconds; can be turned on or off.
- Toggle between 12-hour and 24-hour formats.
- Date, day and local time-zone context.
- Fullscreen/focus display when supported by the browser.

**Important:** the clock uses the user's device time; it is not an independent radio-controlled or certified time reference.

### 2. Stopwatch with laps

- Start, pause, resume and reset.
- Centisecond display (hundredths of a second), lap and split times.
- Lap history and CSV export of recorded laps.
- Suitable for everyday interval timing, casual sport, teaching, productivity and practice.

**Important:** display update frequency can vary with browser throttling; the underlying elapsed-time calculation is designed to minimize drift.

### 3. Countdown timer

- Common preset lengths and custom duration entry.
- Start, pause, reset and quick add-one-minute controls.
- Optional audible finish alert and on-screen indication.

**Important:** keep the tab open and the device awake for dependable notification. Background limits or sleep may delay sound.

### 4. World clock and international time zones

- Compare multiple named cities on a single board.
- Add/remove supported cities and view local date and clock time.
- Uses the browser's time-zone database for daylight-saving changes.
- City choices can be saved on the device.

**Important:** world clock accuracy depends on correctly configured device time and updated browser time-zone data.

### 5. Browser alarm clock

- Create multiple alarms with labels and schedules.
- One-time and repeating weekday alarms, snooze and dismissal.
- Sound and browser notifications where the user allows them.

**Important safety limitation:** a browser tab is *not* a reliable system alarm when closed, suspended or sleeping. Do not rely on Clock84 as a sole alarm for medication, infant safety, critical appointments or emergencies.

### 6. Two-player chess clock

- White and Black clocks with independent starting times and move counters.
- Bullet, blitz and rapid presets, plus custom times.
- **Fischer increment:** add a specified time bonus after each completed move.
- **US simple delay:** countdown only after a per-move grace period expires.
- **Bronstein delay:** refund elapsed time up to the configured delay at move end, rather than accumulate unlimited extra time.
- **Hourglass:** time transfers between players as one clock runs.
- Additional time at a configurable move-number threshold, where set.
- Pause/resume, undo, reset, manual clock adjustment and keyboard controls.

**Important:** for formal tournaments, check the competition's rules and approved clock specifications.

Read the [chess time controls guide](/chess-clock-guide.php) for examples.

## Frequently asked questions

### Is Clock84 free?

Yes. The web-based time instruments are free to use, with no account required.

### Do I need to install anything?

No. Open the website in a modern browser on a phone, tablet or computer.

### Will the world clock adjust to daylight saving time?

World clocks follow the browser's time-zone information. If the browser and operating system have current time-zone data, daylight-saving rules are applied accordingly.

### Will an alarm ring if my browser is closed?

No, this is not guaranteed. Keep the website open and the device awake; browsers and operating systems may suspend alarms and audio.

### Can I export stopwatch results?

Yes. Lap and split entries can be exported to a CSV file.

### Are Fischer, Bronstein and US delay the same thing?

No. Fischer adds time, US delay postpones deductions, and Bronstein refunds consumed time up to the delay allowance. See the [guide](/chess-clock-guide.php).

### Does Clock84 store data on a server?

The time tools primarily operate in the browser and use local storage for preferences and saved settings where applicable. The contact form sends submitted details by email once the site owner configures mail delivery. Hosting providers may maintain normal request logs. Read the [privacy page](/privacy.php).

## About Arcana Synthetica

Arcana Synthetica is an independent digital product studio in Harlingen, Friesland, the Netherlands, focused on straightforward browser-based software for daily tasks, families and self-exploration. The studio creates tools that are easy to open, understand and use without unnecessary accounts or friction.

Arcana Synthetica is associated with Clock84 and the following independently hosted products. Each product's own website remains the best source for current features, claims and privacy policies.

### Product portfolio

| Product | Official website | What it does |
|---|---|---|
| Clock84 | [Clock84](/) | Retro LED clock, stopwatch, timer, world clocks, alarms, chess clock |
| NotaDirect | [notadirect.nl](https://notadirect.nl/) | Free invoicing and related small-business tools, including quotations and VAT calculations |
| Babyphone.online | [babyphone.online](https://babyphone.online/) | Browser-based baby monitoring using two compatible devices, with QR pairing |
| DropToPhone | [droptophone.com](https://droptophone.com/) | Transfer photos and files between devices using web-browser pairing |
| Arcana Profile | [arcanaprofile.com](https://arcanaprofile.com/) | Non-diagnostic self-reflection questionnaire with a personal report |

### Contact and privacy

- [Ask a question or report an issue](/contact.php)
- [Read privacy information](/privacy.php)
- **Official about page:** [Arcana Synthetica](/about.php)
- **Complete project list:** [Portfolio](/projects.php)

Do not claim that these websites have all the same technical infrastructure, data policies or support channels. They are distinct tools.

## Search and AI discovery reference

- [Canonical pages and their exact titles](/site-map.php)
- [XML sitemap](/sitemap.xml)
- [Robots rules](/robots.txt)
- [Concise LLM overview](/llms.txt)
- This long-form Markdown file: `/llms-full.md`

The XML sitemap lists canonical, indexable public pages. The HTML sitemap provides ordinary crawlable links. Schema.org data describes the site, individual pages, publisher, app and breadcrumbs. Search engines and AI platforms decide independently whether they will crawl, index, surface or cite these resources.

## Claims that should not be made

- No guaranteed search ranking, AI citation or prominent placement.
- No guarantee that an alarm will fire when the device is off or the browser is closed.
- No medical, psychological diagnostic, certified time-source or competition-approved device claim.
- No implication that Clock84 itself is an app-store installation or an always-on background service.

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*This descriptive document is published by the Clock84 website. Always prioritize the live UI, privacy policy and project websites if details differ.*