What is the most accurate online stopwatch for speedrunning?

The Stopwatch on Stopwatch.now uses performance.now(), the browser's high-resolution monotonic clock, which is accurate to sub-millisecond resolution on most devices. It supports unlimited laps, CSV export for split records, and runs without any download or account. For official competitive submissions, always verify against the specific game's community rules.

What's the best timer for party games like Taboo or Codenames?

The Bomb Timer adds dramatic tension with a ticking visual and escalating display, perfect for Taboo or Scattergories. For calmer games like Codenames where you want a clean countdown without drama, use the standard Countdown Timer set to 2–3 minutes with a gentle alert sound.

How do I test my reaction time?

Visit the Reaction Test page. It displays a stimulus (a color change or visual signal) after a random delay and measures the time from stimulus to your click response in milliseconds. Average human reaction time is 200–250ms. Below 180ms is considered excellent.

For Gamers

Timer Tools for Gamers — From Speedruns to Board Games

Q: Does the chess clock support Fischer increment?

Yes. The Chess Clock on Stopwatch.now supports Fischer increment — a configurable number of seconds added to your clock after each move. This prevents flagging in time-pressure endgames and is standard in modern tournament formats.

Whether you're timing a speedrun category, competing in a chess tournament, running a party game night, or testing your reaction speed, the right timer makes a difference. A phone clock is a single generic counter. These tools are built for specific gaming contexts — accurate enough for competitive play, clear enough for party games, and dramatic enough to add real tension to timed rounds.

All tools run in your browser. No download, no registration, no lag from a server round-trip. The stopwatch uses your browser's high-precision clock for sub-millisecond accuracy. The chess clock supports Fischer increment. The bomb timer counts down with escalating visual urgency. Whatever you're timing, there's the right tool here.

Test Your Reaction Time

Chess Clocks, Speedrun Timers & Party Game Countdowns

Speedrun Stopwatch

High-precision stopwatch accurate to milliseconds using performance.now(). Unlimited lap splits with timestamps. Export all splits as CSV. Best for: speedrun category practice, split comparison, level clear timing. Quick tip: record a lap at each level/checkpoint to track where you're losing time.

Chess Clock

Two-player alternating countdown. Tap or click to switch sides after each move. Supports Fischer increment (bonus seconds per move) and Bronstein delay. Best for: chess, Go, Scrabble, any game requiring alternating time control. Works on phone for casual tournament play.

Reaction Time Test

Measures the time between a visual stimulus and your response in milliseconds. Shows average over multiple trials. Useful for tracking FPS performance, training reaction improvements, or just settling the debate over who has the fastest reflexes. Average: 200–250ms. Elite: under 180ms.

Bomb Timer

Dramatic countdown with ticking audio, escalating visual urgency, and a big explosion effect at zero. Perfect for Taboo, Scattergories, escape room activities, or any game that benefits from tension. Configurable from 30 seconds to 10 minutes. The ticking sound can be muted for quieter settings.

Countdown Timer

Clean, configurable countdown for board games, card games, and quiz rounds. Set any duration, choose your alert sound, enable auto-repeat for rapid-fire rounds. Best for: Codenames, trivia nights, escape rooms, card game turns, timed puzzle solving.

Random Number Generator

Generate truly random numbers for game setups, initiative rolls, random assignment of teams or roles, or any game that needs fair randomization. Set any min/max range. Also includes dice roller, coin flip, and wheel spinner for tabletop gaming. Best for: RPGs, board games, tournament seeding.

Speedrunning with a Browser Stopwatch

The Stopwatch on Stopwatch.now uses performance.now(), the browser's high-resolution monotonic clock, which is accurate to sub-millisecond resolution on modern browsers. This makes it suitable for casual speedrun practice and category timing where you want to track splits without installing dedicated software.

Use the lap function to record a split at each major checkpoint — level transitions, boss kills, loading screen entries. When you finish a run, export all splits as a CSV file to compare against your personal best or share with your community. The CSV export includes the absolute time and the split delta for each lap.

For official competitive submissions, verify your community's accepted timing methods. Many speedrun communities accept RTA (real-time attack) timing and specify whether they allow web timers for leaderboard submissions. Stopwatch.now is appropriate for practice, comparison runs, and casual competition.

Party Game Timer Setup

Party games live and die by their timing. Too long and players check out; too short and no one can think. Here are the recommended setups for the most common party game scenarios:

Game	Duration	Best Tool	Tip
Taboo	60 seconds	Bomb Timer	The ticking adds real pressure
Codenames	2–3 minutes	Countdown	Amber warning helps groups decide
Scattergories	3 minutes	Bomb Timer	Dramatic reveal at zero
Pictionary	90 seconds	Sand Timer	Visual depletion matches the vibe
Quiz night round	30 seconds	Countdown	Auto-repeat for rapid-fire rounds
Chess (casual)	10+2 or 5+3	Chess Clock	Set Fischer increment to keep endgames alive
Escape room puzzle	60 minutes	Countdown	Fullscreen on a TV for shared visibility

How Fast Is Your Reaction Time?

The Reaction Time Test measures the milliseconds between a visual stimulus appearing on screen and you clicking or tapping in response. The average human reaction time is 200–250ms. Trained FPS players often average 150–180ms. Elite esports professionals have been measured below 130ms in lab conditions.

Reaction time is affected by sleep, caffeine, screen brightness, and practice. Taking the test 5–10 times in a session and averaging the results gives a more reliable baseline than a single attempt. Outlier results (above 400ms) usually indicate a distraction or pre-emption rather than true reaction time.

Use it to settle debates, to warm up before a competitive session, or to track whether your reaction time improves with specific training techniques. No account needed — your scores are calculated locally in your browser.

FAQ for Gamers

How accurate is the browser stopwatch for speedrunning?

It uses performance.now() — sub-millisecond precision on all modern browsers. It's accurate enough for practice and community timing. For official world record submissions, verify with your game's specific community rules about accepted timing methods.

Does the chess clock support Fischer increment?

Yes. Configure Fischer increment (bonus seconds added per move) from the chess clock settings. It also supports Bronstein delay. Both are standard in modern tournament formats.

Can I use the bomb timer for Taboo?

Yes — it's a perfect fit. Set it to 60 seconds, start it when the clue-giver picks up the card, and the escalating ticking adds genuine pressure. The explosion effect at zero is a satisfying visual signal that the turn is over.

What's considered a good reaction time?

Average is 200–250ms. Under 200ms is above average. Under 180ms is excellent. Elite competitive gamers typically average 150–180ms. Sub-130ms results are exceptional and may indicate a very early click or hardware advantage.

Also Useful For

Event organizers running speaking competitions and quiz nights use the same countdown and bomb timers for audience timing. Teams also use the chess clock and countdown for timeboxed meetings and structured discussions.