Name this honestly first. If something is genuinely weighing on you - persistent low mood, anxiety that interferes with life, a situation you can't metabolize alone - you want a licensed clinician: BetterHelp, Talkspace or Talkiatry.
If what you're after is everyday stress management, better sleep and a mindfulness habit, Headspace's app is the right tool at a fraction of the cost - and it pairs well with therapy rather than replacing it (Headspace also sells insurance-based therapy now, which our review covers honestly, low Trustpilot score included). Our Headspace vs BetterHelp comparison covers this fork in depth.