Frequently Asked Questions

Yes. While the physics laws are constant, micro-variations in floating-point math and our added "chaos impulses" ensure that every run is unpredictable and effectively random.

We recommend keeping it under 1000 for the smoothest 60 FPS experience, though modern devices can handle hundreds easily.

Absolutely! The tool is free, ad-free during gameplay, and has no watermarks, making it perfect for broadcast overlays.

Race Mode is a traditional sprint—the first marble to cross the finish line wins. It's ideal for top-3 giveaways or determining priority. Survival Mode is a battle royale—marbles that fall are eliminated, and the last one standing wins. Great for grand prizes and elimination games. Each mode has exclusive effects: Photo Finish slow-motion for Race, and Final Duel zoom for Survival.

Currently we offer two maps (Wheel of Fortune and Classic Pachinko) and don't support custom maps to keep competition fair. However, we're designing new tracks including maze-style and multi-lane layouts that will be added in future updates.

Absolutely! The simulator uses a lightweight Box2D build with mobile-optimized rendering. Most modern phones run smoothly even with hundreds of marbles. If you experience lag, try keeping entries under 200.

Pre-recorded random animations are deterministic—the outcome is effectively fixed. A physics engine lets marbles interact through gravity, collision, and friction in real-time, making every race unique. This ensures genuine randomness while creating a thrilling spectator experience.

That's our "Chaos Factor" easter egg! Marbles occasionally receive a tiny random impulse, which prevents them from getting stuck in obstacles and adds delightful unpredictability to each race.

The champion screen can be screenshotted directly. Full race replay functionality is under development and will support recording playback so you can relive every dramatic comeback.

It uses a dynamic tracking algorithm. In Race Mode, it follows the leading pack to catch the finish. In Survival Mode, it focuses on the marble closest to elimination. You can also hover over the minimap to freely scout the track.

When only two marbles remain, the system triggers a "Final Duel" effect: the camera slowly zooms in, playback switches to slow-motion, and the tension builds for an epic conclusion.

As the leading marble approaches the finish line, the game automatically switches to slow-motion, letting you see exactly which marble touches first. Inspired by real motorsport finish-line photography, it ensures the winner is unmistakable.

Yes! All computation happens locally in your browser. Simply share your screen via Twitch, YouTube, Zoom, or any streaming platform—everyone sees the same real-time action.

Use Name*Count syntax (e.g., Alice*5) to give a contestant multiple marbles, increasing their odds proportionally. The * number shows how many marbles that entrant has in the race.

Box2D is a battle-tested open-source 2D physics engine used in games like Angry Birds. We chose it for its computational efficiency, accurate simulation, and decades of real-world validation—ensuring every roll, bounce, and collision behaves realistically.

A brute-force attack is a hacking method where automated software tries every possible character combination until it finds the correct password. For example, a 4-digit numeric password has only 10,000 combinations — a modern computer can crack it in milliseconds. However, as password length increases and character variety expands, the number of combinations grows exponentially, making brute-force attacks completely impractical.

Security experts recommend at least 12 characters for general use, and 16 characters or more for high-risk accounts like administrators. Every additional character dramatically increases the time required to crack the password. This tool defaults to 12 characters and supports up to 32.

Yes. Adding special characters (e.g., !@#$%^&*) significantly increases the character set size. If you use only lowercase letters, each position has 26 possibilities. By adding uppercase, numbers, and symbols, each position has 95 possibilities. This makes brute-force attempts exponentially harder.

Completely safe. This tool uses Client-side Rendering — all password generation happens locally in your browser. Your passwords are never transmitted over the network, and our server has no way of knowing what passwords you generated.

Some characters look very similar on screen, such as lowercase l and the digit 1, or uppercase O and 0. Including these can cause manual entry errors, leading to login failures. Excluding them doesn't reduce security (the character set remains large enough) but greatly improves day-to-day usability.

The strength meter calculates the entropy of your password, measured in bits. Entropy represents how unpredictable a password is. It's calculated from both the password length and the size of the character set used. Generally, 60 bits or more is considered strong, and 80 bits or more is considered very strong.

Yes. This tool uses the Web Crypto API (crypto.getRandomValues()), a cryptographically secure random number generator built into all modern browsers. It is backed by the operating system's entropy sources (hardware noise, mouse movements, keyboard timings, etc.) and is suitable for cryptographic use — unlike the basic Math.random().

The traditional advice was every 3 months, but modern security guidance says you don't need to change your password frequently unless you suspect it has been compromised. NIST's latest guidelines have also removed mandatory periodic password changes. What matters more is using a unique strong password for each account and enabling two-factor authentication (2FA).

Highly recommended. Password managers (e.g., 1Password, Bitwarden, LastPass) securely encrypt and store all your passwords, so you only need to remember one master password. This is currently the best practice for balancing security and convenience. The strong random passwords generated by this tool are an ideal match for password managers.

A dictionary attack is a hacking technique that uses a pre-compiled list of common passwords (frequently used words, phrases, birthdays, pet names, etc.) to guess your password. Because many people use real words or simple combinations, dictionary attacks often succeed faster than brute-force. Using a completely random password protects against this.

For a truly random password generated by this tool (12+ characters with multiple character types), it would take even a supercomputer millions of years to crack via brute force. The real risk isn't someone guessing your password — it's reusing the same password across multiple sites, so a breach on one site compromises all your accounts.

The history is stored only in your current browser tab's memory. It disappears when you close or refresh the page. It is never written to disk, cookies, or LocalStorage, so other users on the same computer cannot see your passwords. If you're on a shared computer, simply close the tab when you're done.

Yes. The tool is built with a responsive design that works on both phones and tablets. Whether you're using Safari on iOS or Chrome on Android, both support the Web Crypto API, so you get the same level of password security as the desktop version.

Credential stuffing is an attack where automated tools use username/password pairs leaked from one website to try logging into many others. According to Akamai, there are over 4 billion credential stuffing attempts every day worldwide. The best prevention methods are simple: 1. Use a unique password for every website (the core purpose of this tool) 2. Enable two-factor authentication (2FA) 3. Use a password manager to store all passwords 4. Regularly check https://haveibeenpwned.com to see if your accounts have been compromised

Built-in browser password generators offer basic features: fixed length (usually 12-15 characters), no character type customization, no ambiguous character exclusion. This tool provides: 1. Adjustable length (6-32 characters) 2. Four character types freely combinable 3. Ambiguous character exclusion 4. Real-time strength detection (entropy calculation) 5. Recent history storage 6. Responsive design and one-click copy. Additionally, browser-generated passwords are automatically saved to the browser's password manager, which may not be desirable for privacy-conscious users.

The average human reaction time ranges from 200 to 250 milliseconds for a simple visual stimulus. Most people fall within this range. Scores under 200ms are considered above average, while scores under 150ms are in elite territory — comparable to professional athletes and esports players.

Reaction time peaks in your early-to-mid 20s and gradually slows thereafter. Children tend to have slower reaction times that improve as their nervous system matures. However, regular physical and cognitive activity can help maintain fast reaction times well into older age. The decline is typically about 2–6ms per decade after age 25.

Professional esports players typically average 130–170ms in simple reaction tests. Top-tier players in fast-paced games like Valorant, CS:GO, or Street Fighter can achieve sub-150ms reactions consistently. This is the result of both natural aptitude and thousands of hours of deliberate practice.

Yes. While genetics play a role, reaction time can improve by 10–20% with consistent training. Effective methods include: regular reaction-specific drills, getting adequate sleep (7–9 hours), aerobic exercise (which improves brain oxygenation), and reducing multitasking. The key is consistency — short daily practice is more effective than long sessions once a week.

Lightning Reflex measures your pure visual reflex — just see green and click. Aim Strike adds hand-eye coordination — you need to locate and hit moving targets under time pressure. Dual Choice introduces decision-making — you must identify the color and choose the correct side, which takes additional processing time. Each mode tests a progressively more complex cognitive pathway.

This test provides a reasonably accurate estimate for casual use, but it's not a substitute for laboratory-grade equipment. Factors like monitor refresh rate (60Hz vs 144Hz+), input lag from your mouse/display, and browser processing can affect results by 10–30ms. For a more precise measurement, use a dedicated device with a high-refresh-rate monitor.

Significantly. Sleep deprivation of just 2–3 hours can slow your reaction time by 50–100ms — equivalent to a few alcoholic drinks. Chronic fatigue accumulates and degrades cognitive processing speed. This is why reaction tests are sometimes used to detect driver fatigue. Always test when you're well-rested for the most accurate baseline.

Most people have a dominant hand that reacts 10–20ms faster than their non-dominant hand. This is normal and reflects neural pathway efficiency for your preferred hand. Ambidextrous individuals may show little to no difference. The Lightning Reflex mode can reveal this asymmetry if you alternate hands across rounds.

Research shows that red stimuli tend to be detected slightly faster than green or blue, likely due to the human visual system's evolutionary sensitivity to red. However, the difference is usually under 10ms and varies by individual. Our tests use consistent colors to minimize this variable.

The 1–5 second random delay prevents anticipation. Without it, you could predict exactly when the stimulus will appear and time your click, which would measure anticipation rather than true reaction time. The randomness ensures each round captures your genuine reflex speed.

Your score combines three factors: base points (+1 per hit), speed bonus (+2 extra for hits within 0.5 seconds), and combo multiplier (consecutive hits without missing). The combo multiplier starts at 1x and increases with each successive hit, up to a maximum of 5x. Missing resets the combo. The formula is: (base + bonus) × combo_multiplier per hit.

The Dual Choice test measures choice reaction time — which is 50–100ms slower than simple reaction time. The extra time accounts for stimulus identification (determining the color), response selection (choosing left or right), and response programming. This test better reflects real-world cognitive demands where you must both perceive AND decide before acting.

Some studies suggest a weak to moderate correlation between faster reaction times and higher IQ scores, particularly in tests involving complex decision-making. However, reaction speed is just one of many cognitive factors and not a reliable standalone predictor of intelligence. Think of it as one data point in a much larger picture.

To earn the ⚡ Lightning rating, you need an average reaction time below 150 milliseconds across all 5 rounds in Lightning Reflex mode. This is an elite-level score comparable to professional esports players. Tips: ensure you're well-rested, use a low-latency monitor and mouse, sit in a distraction-free environment, and practice consistently.

Follow this standardized testing protocol to obtain a reliable baseline reaction time: 1. Environment Control: Test in a quiet, well-lit environment; Use a wired mouse (wireless adds 1-8ms latency); Close other applications, especially media players and messaging apps. 2. Personal State: Test when well-rested (recommended 9-11 AM); Avoid caffeine and alcohol for 12 hours before testing; Ensure at least 7 hours of sleep the night before. 3. Testing Protocol: Warm up for 3 rounds (results not counted); Minimum 5 official rounds (Lightning Reflex mode); Remove obvious outliers (e.g., accidental early clicks under 50ms); Use median instead of mean (median is more robust against extreme values). 4. Equipment Logging: Note your monitor's refresh rate and mouse model; Only compare results from the same equipment setup.

They're comparable — both use the device's hardware clock. This online stopwatch uses the performance.now() API, achieving millisecond precision in both desktop and mobile browsers. The advantage of an online stopwatch is that it requires no installation, supports fullscreen mode, keyboard shortcuts, and advanced lap timing features.

A stopwatch counts upward from zero, measuring elapsed time. A countdown timer starts from a preset duration and counts down to zero. Use a stopwatch when you need to know "how long did that take?" and a countdown timer when you need to know "how much time is left?" — like cooking eggs or timing a break.

This stopwatch tracks one main timer at a time. In Loop mode, you can record individual lap times for different people, distinguished by lap number. For independent multi-person timing, you may want to open multiple browser tabs or use dedicated multi-timer software.

Lap timing lets you record intermediate times without stopping the overall timer. For example, during a run you can press "Lap" at each mile to see split times afterward. The timer automatically highlights your fastest and slowest laps, helping you analyze your performance.

Touch-to-start (touching the pill button → releasing triggers the start) eliminates the delay caused by physically pressing a button. Traditional buttons introduce 0.1–0.3 seconds of latency between deciding to start and when timing actually begins — a significant margin for speedcubing or reaction-based timing. Release-to-start ensures the timer begins the instant your finger leaves the button.

Best times are stored in browser memory and persist across resets and mode switches within the same session. However, they are cleared when you close the tab or refresh the page. This is intentional — no cookies, logins, or databases are required, protecting your privacy.

L (record lap) only works in Loop mode while the timer is running — pressing L in other modes has no effect. C (reset) only works when the timer is paused — pressing C while running won't reset; you must press Space to pause first.

Press the F key to toggle fullscreen off. You can also click the "Exit Fullscreen" button (⤓) on screen, or press Esc on your keyboard to exit the browser's native fullscreen mode.

Yes, for general lab timing. It offers millisecond precision, Record mode for automatic top-3 tracking across consecutive trials, and Loop mode for recording multiple data points. However, it is not a calibrated scientific instrument and should not be used for clinical or industrial measurements requiring formal certification.

This is typically caused by browser power-saving mechanisms or page performance fluctuations. When the browser tab is backgrounded or the CPU is under load, performance.now() callbacks may become irregular. If you notice visible stuttering, try closing other tabs or refreshing the page.

Indefinitely, in theory. However, over extended periods (several hours), browser power-saving features may introduce minor cumulative drift, and performance.now() precision may degrade slightly. For sessions lasting more than a few hours, consider restarting the timer every hour to maintain accuracy.

Simple mode: Quick everyday timing — cooking, simple workouts. Minimal steps, maximum speed. Record mode: Consecutive attempts with personal best tracking — fitness tests, reaction drills. Automatically records top 3. Loop mode: Activities needing split/segment recording — running laps, swim intervals. Automatically highlights fastest/slowest. Cube mode: Precision timing where start-up delay matters — speedcubing, reaction time tests.

This is one of the most commonly confused concepts in stopwatches: Lap Timing: Records the time of each individual segment while the overall timer keeps running. For example, during a 5K run, pressing Lap at each kilometer gives you "Lap 1: 4:30, Lap 2: 4:45...". Split Timing: Records the cumulative time from the start to each checkpoint. Using the same example, it shows "Split 1: 4:30, Split 2: 9:15...". This stopwatch's Loop mode uses Lap Timing (individual segment time) because it's most valuable for sports performance analysis — letting you see the fluctuation in each lap at a glance.

Here's a detailed comparison of keyboard shortcuts across all four modes: Simple Mode — Space/S: Start/Pause, L: No action, C: Reset (paused), F: Toggle Fullscreen, ←/→: No action. Record Mode — Space/S: Start/Stop, L: No action, C: Reset (paused), F: Toggle Fullscreen, ←/→: No action. Loop Mode — Space/S: Start/Pause, L: Record Lap, C: Reset (paused), F: Toggle Fullscreen, ←/→: Start/Pause. Cube Mode — Space/S: Touch Start, L: No action, C: Reset (paused), F: Toggle Fullscreen, ←/→: No action.

No, it will not. When the computer enters Sleep or Hibernation mode, the JavaScript execution thread is suspended and the performance.now() counter stops. Upon wake, the stopwatch displays the value from before sleep, even if several hours have passed. Solutions: Prevent the computer from sleeping during long timing sessions. Disable auto-sleep in system settings. For timing that must span sleep cycles, use a dedicated physical stopwatch. Check the time immediately after wake; reset if any doubt about accuracy.

Yes. "Chungyuan Standard Time" (中原標準時間) was the historical name used in Taiwan, derived from mainland China's time zone naming convention. Today, the official name is Taiwan Standard Time (TST) or "National Standard Time," though some people still use the older name colloquially.

No. Taiwan does not observe DST. The time offset remains UTC+8 year-round. DST was briefly implemented in Taiwan between 1945–1960 but has since been abolished.

UTC+8 is used by Taiwan, China (Beijing Time), Hong Kong, Macau, Singapore, Malaysia, the Philippines, Brunei, Western Australia (Perth), Central Indonesia, most of Mongolia, and parts of Russia (Irkutsk).

Your phone's clock relies on cellular tower or GPS sync and is generally quite accurate. However, this clock performs an additional dual-API cross-verification via NTP time servers, which can detect and correct small deviations in your device's system time — making it theoretically more precise.

Your computer or phone's internal real-time clock (RTC) chip can drift due to temperature changes and battery aging — potentially losing or gaining several seconds per day. NTP (Network Time Protocol) synchronizes your device with atomic clocks, keeping errors within milliseconds.

Fullscreen mode is ideal for exam proctoring, New Year's Eve countdowns, meeting/presentation timers, the Pomodoro technique, video recording timecode references, and displaying on secondary monitors or projectors as a public clock.

Millisecond precision is handy for flash sales or ticket purchasing, network latency tests, sports timing, performance benchmarking, or simply for the visual satisfaction of watching time tick by in fine detail.

Yes. The clock continues running using your device's local system time, regardless of internet connectivity. However, if you refresh the page while offline (with a cleared cache), NTP correction won't be applied. For best accuracy, use this tool with an active internet connection.

No — this clock is fixed to Taiwan Standard Time (UTC+8) regardless of your physical location. If you need a clock for another time zone, please check our other tools on this site.

Absolutely. Resize your browser window and enable fullscreen mode for a clean desktop clock on your secondary monitor. The clock auto-resyncs every 5 minutes to maintain long-term accuracy.

Yes. The large fullscreen font makes it readable from the back of a classroom, and the millisecond mode provides high precision when needed. It works best when displayed on a projector or large screen.

Definitely! With millisecond-level precision, it's perfect for New Year's parties or live-streamed countdown events. Switch to fullscreen mode and count down together with everyone in the room.

This tool uses a dual-layer redundant time synchronization strategy. On page load, it simultaneously sends HTTPS requests to timeapi.io and worldtimeapi.org to obtain RFC 3339 formatted server timestamps. It then calculates three values: server time (minus half the network round-trip delay), local system time, and the offset between them. This offset is stored in memory and applied to all subsequent time displays. If the primary API is unresponsive (5-second timeout), it automatically switches to the backup API. If both fail, it falls back to local system time. A full verification cycle runs automatically every 5 minutes.

Taiwan is located between 120°E and 122°E longitude, which theoretically falls within the UTC+8 time zone (one time zone per 15° of longitude). After Taiwan's retrocession in 1945, the Nationalist government adjusted the time zone from "Japan Standard Time (UTC+9)" to "Chungyuan Standard Time (UTC+8)". From the 1970s onward, the official name gradually changed to "Taiwan Standard Time" or "National Standard Time". Interestingly, Taiwan did observe Daylight Saving Time between 1945 and 1960, but due to Taiwan's low latitude with minimal day-length variation, the energy-saving effect was limited. It was ultimately abolished in 1961, and Taiwan has maintained a fixed UTC+8 offset year-round ever since.

It can serve as a daily alternative, but the use cases differ slightly. time.gov is the official U.S. time, driven directly by NIST atomic clocks with microsecond precision; time.is supports time zone queries for 7 million locations worldwide. This tool focuses on clear Taiwan Standard Time display, with key differences including: a large-font fullscreen mode better suited for events, dual-API cross-verification every 5 minutes, and a Chinese interface that's more friendly for local users. If you need official-grade maximum precision, we recommend referring directly to the National Time and Frequency Standard Laboratory of Taiwan.