Why Certa Works When Nothing Else Does

  • verified

    100% Wake-Up Rate

    Vibration wakes 100% of deep sleepers in controlled clinical studies — versus only 67% for loud audio alarms

  • 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.

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      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
    100% wake-up rate in studies

    The Numbers Don't Lie

    Certa isn't just a different alarm. It's a biologically superior wake-up signal backed by sleep science.

    What Heavy Sleepers Experience With Certa

    100%

    Wake-up rate in controlled clinical studies — versus only 67% for loud audio alarms

    94%

    Of Certa users report waking up calmer and with significantly less morning panic than with traditional alarms

    89%

    Of partners report a significant improvement in their own sleep quality after switching to Certa

    Based on clinical vibration alarm research and user-reported outcomes from heavy sleepers who had previously failed with audio-based alarms.

    Wake Up With Certa →