Why Certa Works When Nothing Else Does

  • verified

    Clinically Supported

    Published sleep research shows vibration-based alarms wake significantly more deep sleepers than traditional loud audio alarms — where approximately one in three subjects slept through entirely

  • bedtime

    Completely Silent

    Zero sound means your partner sleeps undisturbed. No alarm wars. No guilt. No sleeping in separate rooms

  • sensors

    Tactile Bypass

    Direct wrist vibration activates a physical pathway your sleeping brain cannot habituate to or filter out the way it does with sound

  • psychology

    You're Not Broken

    Sound-based alarms are biologically flawed for certain sleepers. Certa doesn't judge you — it fixes the right problem with the right tool

    Finally. An Alarm Built For Heavy Sleepers.

    Compare Certa against every alarm you've already tried and failed with.

    Get Certa Now →
      Loud Alarms Fitness Trackers Shock Clocks
    Bypasses auditory habituation
    Silent — won't wake your partner
    Comfortable to wear overnight
    Works for heavy sleepers
    No pain or discomfort