What is the best alternative to StressWatch: AI Stress Monitor on iPhone?

Stress Monitor for Watch: HRV, A tier, #2 in stress monitoring.

Is there a free alternative to StressWatch: AI Stress Monitor?

Yes: Stress Monitor for Watch: HRV (A tier, #2) is free to download.

No. StressWatch: AI Stress Monitor is #1 in stress monitoring.

StressWatch: AI Stress Monitor is S tier, #1 of 8 in stress monitoring. Here is everything that competes with it on iPhone, in tier order.

2
Stress Monitor for Watch: HRVA
Free download · ★ 4.5 · 9,163 ratings · score 90
Shows stress, recovery, and activity and sleep trends from Apple Watch heart data, with a daily stress heat-map and.
3
Pulsebit: Heart Rate MonitorA
Free + IAP · ★ 4.5 · 22,419 ratings · score 88
Measures pulse and HRV with the phone's rear camera and flashlight, plus a mood tracker, trend insights and wellness.
4
BreathNow - blood pressure appA
Free + IAP · ★ 4.7 · 2,776 ratings · score 84
Tracks blood pressure, heart rate and stress, with breathing exercises, meditations and a Cambridge cardio fitness test.
5
Grow: Health & FitnessA
Free + IAP · ★ 4.7 · 4,622 ratings · score 82
Apple Watch app tracking steps, sleep, HRV, workouts, hydration and sunlight, with friend care and challenges.
6
BalanceMe-Health AI&Self CareC
Free + IAP · ★ 4.5 · 6,585 ratings · score 62
Measures heart rate via the rear camera and tracks stress, mood, blood pressure, blood sugar and blood oxygen.
7
Stress & Heart Rate MonitorD
Free + IAP · ★ 4.6 · 212 ratings · score 59
Tracks HRV, sleep and activity data from Apple Health and shows a personalized Stress Score with trends and alerts.
8
Elite HRV: Wellness & FitnessD
Free download · ★ 4.7 · 6,906 ratings · score 54
Heart rate variability (HRV) tracking app that shows daily HRV, a morning readiness score, and stress and recovery.

What is the best alternative to StressWatch: AI Stress Monitor on iPhone?: Stress Monitor for Watch: HRV, A tier, #2 in stress monitoring.
Is there a free alternative to StressWatch: AI Stress Monitor?: Yes: Stress Monitor for Watch: HRV (A tier, #2) is free to download.
Does anything rank above StressWatch: AI Stress Monitor?: No. StressWatch: AI Stress Monitor is #1 in stress monitoring.