01
What is a dead man's switch in DMH?
A dead man's switch is a watchdog timer that stays quiet while you keep postponing it. If you miss the check-in window, DMH automatically runs the actions you configured.
Your ultimate insurance policy
Dead Man's Hand
Watchdog timer & postponed reminder system
Set timers that trigger automated actions — emails, webhooks, notifications — unless you postpone them. Your digital failsafe for critical tasks and deadlines.
Free & openSetup in 60 sESP32 Healthcheck readyOffline-ready PWA
Features · 06
Everything you need to never miss a deadline
Watchdog Timer
Dead man's switch that triggers actions if the timer is not postponed. Perfect for critical deadlines and failsafe scenarios.
Learn moreChallenge
A shared commitment with a check-in calendar: track medication, habits or delegated work — keep it for yourself or assign it to another user — and confirm every occurrence.
Learn moreHealthcheck
Watch a service instead of a clock: poll a URL for the expected response, re-arm from an ESP32 motion sensor, or hand a cron job its own ping URL — silence past the deadline raises the alarm.
Learn moreSmart Reminders
Three modes in one: classic Alarm with repeat schedules, Pomodoro work/break cycles, and Spaced Repetition for memorization.
Learn morePublication
Write the article now, publish it later. When the timer runs out DMH posts it to the public feed on its own — nobody has to be at the keyboard.
Learn moreCooperative
A shared gate: one or more tasks stay locked until every user added to the cooperative operation confirms. The mode also intersects the free time members declare, so joint plans land in a window that suits everyone.
Learn moreProcess · 03 Steps
How it works
01/03
Create a task
Set up a watchdog timer or reminder with your desired schedule.
02/03
Postpone or let it fire
Keep postponing the timer to prove you're active — or let it expire to trigger actions.
03/03
Actions fire automatically
Emails are sent, webhooks triggered, and notifications delivered — all hands-free.
Answers · Search-friendly
What people ask before they trust a timer
02
How is DMH different from a normal reminder app?
Normal reminders only notify you. DMH can escalate: send emails, trigger webhooks, push notifications, and run action chains when a timer expires.
03
What actions can DMH run when a watchdog timer fires?
DMH supports automated email delivery, file attachments, webhooks, push notifications, Telegram and SMS-style escalation flows, depending on your configured task.
04
Can I re-arm a Healthcheck from hardware?
Yes. Create a Healthcheck, then pair an ESP32 motion sensor. Each motion signal re-arms its configured check interval; Healthchecks can also monitor an expected URL response.
Start protecting your deadlines
Free to use. Set up your first watchdog timer in under a minute.