The usual HRV app flow: data β algorithm β verdict β user. HRVSpark reverses it: data β user β intuition.
Raw SDNN sparklines and gauges on your Apple Watch face, across four time windows. Complication-first β always visible, never buried in an app.
Works alongside analysis suites like Athlytic or HRV4Training, or stands alone as your only HRV tool.
$2.99 one-time. No subscription. No account.
