Sleep and Tab Isolation Proof
Unlike standard JavaScript interval loops that slow down in hidden tabs, ArunBuild checks physical epoch timestamps. Feel free to minimize this window or sleep your computer.
Focus History
0 sessions today · 🔥 0 days streak
Timer Precision & Sound
Click "Show Settings" to adjust durations, chime volume, and session history.
Why this countdown stays mathematically exact in background tabs
Conventional web timers drop ticks the second you change tabs. ArunBuild was re-architected with timestamp anchoring and synthetic Web Audio.
Timestamp Anchored, Not Tick-Counting
Browsers aggressively throttle background JavaScript timers to once per minute to save battery. ArunBuild calculates exact epoch timestamp differences, guaranteeing zero drift when switching back.
Pure Web Audio API Synthesis
The completion chime is generated on the fly via Web Audio API oscillators with an acoustic decay envelope. No MP3 downloads, zero audio buffering latency, and fully functional 100% offline.
25 Minutes Is a Starting Point, Not a Law
Twenty-five minutes was simply what the inventor's kitchen timer was set to in 1980. Adjust it to 15m sprints or 50m deep programming flow effortlessly.
100% Client-Side & Zero Tracking
Your task names, focus streaks, completed session counts, and custom durations live strictly inside your browser's local sandbox. No accounts, no database sync, and zero trackers.
How the cycle fits together
The Pomodoro Technique is a simple pattern: work for a fixed stretch of focused time, then take a short break. After a few of those cycles, take a longer one. That's the entire method. It was named in the 1980s after a tomato-shaped kitchen timer — pomodoro is Italian for tomato — and the timer is doing most of the actual work. It turns "keep going until I feel like stopping" into "keep going until the timer says stop," which is a far easier promise to keep.
Eliminating Daily Micro-Decisions
It works because it removes two decisions you'd otherwise make constantly while working: when to start, and when it's acceptable to stop. Both get answered in advance. You don't negotiate with yourself moment to moment about whether you're still concentrating — you watch the number, and when it hits zero, you're done for now, guaranteed.
Sound is Generated, Not Recorded
The chime at the end of a phase is not an audio file. It's built in real time with the Web Audio API — two soft oscillator tones with a decay envelope, which is what makes it read as a bell rather than a beep. Nothing downloads, nothing needs to buffer, and it operates natively offline.
Frequently asked questions
What is the Pomodoro Technique?
Work for a fixed stretch of time, then take a short break. After a few of those cycles, take a longer break. That's the whole method — a timer removes the two decisions that usually derail focus: when to start, and when it's okay to stop.
Why is the default 25/5/15, and should I change it?
Change it if it doesn't fit you. 25 minutes was simply what the technique's inventor had his kitchen timer set to in the 1980s — there's no research behind that exact number. The rhythm of focused work followed by a break is what matters, not the number of minutes. Every duration here, including how many sessions happen before a long break, is a plain editable number, not a locked preset.
Why does the countdown stay exactly right even if I switch tabs for a while?
Because it isn't counting down. The timer stores the exact moment the current phase should end and, whenever it checks, compares that to the current time. Background the tab for twenty minutes or lock your phone — the remaining time on return is exact, because it was never derived from counting ticks in the first place.
Does closing or reloading the page keep my session running?
No. Your settings and your streak are saved, but an in-progress countdown is not — closing or reloading the tab resets the current session back to its full duration. Keep the tab open, even in the background, while a session is running.
Is any of my data sent anywhere?
No. Your durations, sound preferences, and streak history live only in your browser's local storage. There's no account, no sign-in, and this page makes no network requests beyond the one that loaded it.
Why doesn't skipping a session count toward my streak?
Because skipping isn't finishing. A day only counts once a focus session actually runs its full length — the streak is meant to reflect completed focus time, not button presses.
Is the chime a sound file?
No. It's generated in real time with the Web Audio API — two short oscillator tones with a decay envelope. Nothing downloads, and it works offline. You can change its volume or mute it entirely in Settings.
Does this page work without an internet connection?
Yes, after you've opened it online once. It caches its own app shell so a later visit with no connection still opens and runs.