White Noise
Constant power across all frequencies. Ideal for masking distracting speech.
FREQUENCY: HIGH
2 Hour Timer
Two hours — exam length, and about as far as a session goes without a real break.
25:00
Ready
Nothing selected
Sound Library
Calibrated frequencies for deep work and relaxation.
Color Noises
Continuous frequencies for auditory masking.
Brown Noise
Deep, bass-heavy rumble reminiscent of a distant waterfall or thunder.
FREQUENCY: LOW
Pink Noise
Balanced spectrum that sounds more natural to the human ear, like steady rain.
FREQUENCY: BALANCED
Red Noise
Even deeper than Brown noise, focusing heavily on the low-end spectrum.
FREQUENCY: LOW
Black Noise
Near-silence with subtle low-frequency drift. Meditative, like the sound of a quiet room at night.
FREQUENCY: NEAR SILENT
Grey Noise
Psychoacoustically equalized to sound equally loud at every frequency.
FREQUENCY: EQUALIZED
Ambient Sounds
Natural soundscapes recorded in high fidelity.
Rain
Gentle rainfall creating a natural, soothing atmosphere perfect for deep concentration.
SOURCE: RECORDED
Rain on Tent
Rainfall on a tent canvas — cozy, immersive and deeply relaxing for focused work.
SOURCE: RECORDED
Ocean Waves
Rhythmic ocean waves rolling onto shore — a timeless natural soundscape for calm focus.
SOURCE: RECORDED
Wind
Steady breeze flowing through open spaces — airy and expansive for clear thinking.
SOURCE: RECORDED
Forest Stream
A gentle brook flowing through a quiet forest — peaceful and grounding for deep work.
SOURCE: RECORDED
Meadow
Birds and insects in a sunlit meadow — warm, organic ambience for relaxed focus.
SOURCE: RECORDED
Binaural Beats
Brainwave entrainment through stereo frequency offset. Layers with any noise above.
Headphones required for binaural effect
Delta
Deep sleep and healing. Ultra-low 2 Hz beat for total relaxation.
BEAT: 2 Hz
Theta
Meditation and creativity. 6 Hz beat for deep introspection and flow.
BEAT: 6 Hz
Alpha
Calm focus and learning. 10 Hz beat for relaxed concentration.
BEAT: 10 Hz
Beta
Active thinking and energy. 14 Hz beat for alertness and problem solving.
BEAT: 14 Hz
The exam block
Two hours is a standard exam length across a lot of the world, which makes it the block to use for practice papers. Sitting one under the real time limit, in one go, without pausing to check anything, is a different exercise from working through the same paper over an afternoon — and it is the one that tells you whether you are ready.
If that is what you are doing, set the timer, put the phone elsewhere, and treat the countdown as binding. Stopping early because you have finished is fine. Stopping to look something up is not.
Two hours that is not an exam
For ordinary work, two hours is at the limit of a single sitting. It happens to line up with the ultradian rhythm often cited in productivity writing — a roughly ninety-minute to two-hour cycle of alertness — and although the evidence for applying that directly to desk work is thinner than it is usually made to sound, most people can feel the drop somewhere in that region.
Two hours is also what four Pomodoro rounds add up to, which is not a coincidence. The technique breaks the same span into pieces with recovery built in. If you are choosing between one two-hour block and four twenty-five-minute rounds, the rounds will usually leave you in better shape.
Sound over a long session
At this length, fatigue is the deciding factor. White noise and grey noise mask hardest but very few people want them for two hours. Brown noise, pink noise, rain and forest sounds are all designed to be left running and are the safer choices.
Whatever you pick, decide before you start. A session this long provides plenty of opportunities to spend five minutes choosing a different sound, and that is procrastination with a nicer interface.
Common questions
Should I work for two hours without a break?
Usually not. Four Pomodoro rounds cover the same span with recovery built in and generally leave you in better condition. Two unbroken hours makes sense when you are simulating a timed exam or the work genuinely cannot be interrupted.
Will the timer survive two hours in a browser tab?
Yes, as long as the tab stays open. Keep it visible where possible — some browsers throttle background tabs and phones may suspend audio.
What is the best sound for a long session?
Anything that does not fatigue: brown noise, pink noise, rain or forest sounds. White and grey noise mask more but few people want them for two straight hours.