meiso is the world's simplest meditation timer that quantifies your practice with HRV (heart rate variability) analysis.
• HRV-based meditation skill leveling (FFT, LF/HF)
• External BLE heart-rate sensor support (Polar H10)
• Real-time heart-rate waveform during sessions
• Apple Watch app + Apple Health (Mindful Minutes)
• Countdown / count-up timer with bell sound
• 5 languages (EN / JA / ES / KO / ZH)
• 100% free, no ads, no subscription, no account
