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Cues{{ resultsReady ? displayPlan.values.planned_event_count : '—' }} Prep{{ resultsReady ? `${displayPlan.normalizedInputs.prep_s} s` : '—' }} Chimes{{ resultsReady ? displayPlan.values.total_chimes : '—' }}
Preset changes are explicit; direct timing edits switch the plan to Custom.
0–180 minutes; zero is open-ended. The slider covers the most common 0–60 minute range.
min
0–60 seconds before the measured sit begins.
s
0–60 minutes; zero disables interval cues.
min
Whole chimes from 0 to 6.
Whole chimes from 0 to 6 per interval.
Whole chimes from 0 to 6; ignored by an open-ended plan.
{{ audio_volume }}%
Neutral default: muted. Visual and supported vibration cues remain separate.
220–1200 Hz; inactive while volume is 0%.
Hz
40–1000 ms per chime.
ms
60–2000 ms between repeated chimes.
ms
Neutral default: off. Unsupported browsers ignore the request.
{{ vibrate ? 'On' : 'Off' }}
Neutral default: off. Browser and operating-system support varies.
{{ keep_awake ? 'On' : 'Off' }}
Neutral default: off.
{{ show_visual ? 'On' : 'Off' }}
40–1000 ms; inactive while visual cues are off.
ms

The chart renderer is unavailable. The same cue offsets remain available in the schedule.

CueSitting offsetChimesMeaningCopy
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Plan
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Cue reading

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  • The prep countdown happens before sitting offset zero.
  • Interval cues never replace the closing cue at a fixed finish.
  • Browser sound, vibration, and wake lock are convenience features, not certified alarms.
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Pomodoro Timer Plan focus rounds and short or long breaks, estimate a goal finish time, and run a browser-based Pomodoro countdown with quiet cues.
Progressive Muscle Relaxation (PMR) Coach Build a paced progressive muscle relaxation routine that sequences body regions with tense-and-release timing, comfort reminders, and live cues.

Bells in a timed meditation are landmarks. An opening cue separates preparation from the measured sit, interval cues can mark agreed transitions, and a closing cue ends a fixed period without requiring anyone to check a clock. The schedule works best when each sound has a clear purpose and the quiet between cues remains the main part of the practice.

Preparation time is outside the sitting duration. A 20-minute sit with a 10-second settling countdown still contains 20 measured minutes; the opening cue occurs after those 10 seconds, at sitting offset zero. This distinction matters when several people need the same start, or when a session must finish at a known time.

Plan Finish Useful for
Fixed duration A known sitting length with an optional closing cue. Classes, breaks, group practice, or a defined personal routine.
Open-ended No automatic finish; the session ends when it is stopped or reset. Self-directed practice where elapsed time matters more than a deadline.

Interval spacing should reflect the practice rather than fill silence. A midpoint bell may help a long sit, while frequent chimes can interrupt attention or become something to anticipate. Opening, interval, and closing bell counts are separate so a group can distinguish boundaries by sound without verbal instruction.

Elapsed time and cue count do not measure attention, calm, posture, insight, or mental health. Meditation can also be uncomfortable or distressing for some people. Use timing as practical structure, not as treatment evidence or a reason to delay professional care.

How to Use This Tool:

Choose the sitting boundary first, then add only the cues the practice needs.

  1. Choose a Preset or edit Session length. A positive whole number from 1 to 180 minutes creates a fixed sit; 0 creates an open-ended sit.
  2. Set Preparation countdown from 0 to 60 seconds. This delay finishes before sitting offset zero and does not shorten the planned sit.
  3. Choose Interval spacing and the opening, interval, and closing bell counts. Interval spacing 0 disables interval cues, and a bell count of 0 suppresses that cue type.
  4. Test the selected cue path on the device. Sound requires volume above 0; vibration, visual flash, and screen-awake behavior depend on browser and device support.
  5. Check the cue schedule before pressing Start. The active run freezes that plan. For an open-ended sit, use Stop or Reset because no closing event is scheduled.

Technical Details:

Cue offsets are measured from the sitting start. Preparation seconds are added before the schedule begins, so they affect the real clock time of every cue without changing any sitting offset. During a run, elapsed time is compared with each frozen offset and every newly due cue is fired.

Formula Core:

Whole minutes are converted to seconds before the schedule is built.

T=60m I=60q

For a fixed sit, interval cues occur at positive multiples of the spacing strictly before the finish. When interval bells are enabled, the count is:

Ninterval = max(0, ⌈TI⌉ -1)

The total chime count multiplies each scheduled cue type by its bell count.

C= cstart + Nintervalcinterval + cend

Here m is session minutes, q is interval minutes, T and I are seconds, and each c is the selected bell count. A disabled cue type contributes zero.

Cue Rule Core:

Cue Fixed sit Open-ended sit
Opening Offset 0 when opening bells are greater than 0. Same rule.
Interval Positive multiples of the spacing where the offset is strictly less than the finish. Positive multiples through a three-hour preview horizon, capped at 60 interval events.
Closing Exactly at the session finish when closing bells are greater than 0. Never scheduled because no finish exists.

Bell counts are whole numbers from 0 to 6. Audio pitch accepts 220 to 1200 Hz, each chime lasts 40 to 1000 milliseconds, and the repeated-bell gap accepts 60 to 2000 milliseconds. The visual flash also accepts 40 to 1000 milliseconds.

Fixed sessions can contain up to 179 interval events at one-minute spacing. Open-ended schedules are finite previews only; elapsed timing continues beyond the preview until the session is stopped or reset.

Limitations and Privacy:

The plan and live session run in the browser, and no meditation schedule is uploaded for calculation. Browser cues are conveniences rather than guaranteed alarms.

  • Muted audio, denied permissions, battery saving, a locked screen, or an unsupported browser can suppress sound, vibration, or wake-lock behavior.
  • A backgrounded or sleeping device may deliver a cue late; several overdue cues can become due together when execution resumes.
  • Open-ended preview rows do not promise future cues beyond the three-hour or 60-event preview limit.
  • Timing output is informational and does not evaluate the benefits, safety, or quality of a meditation practice.

References: