Online Breathing Timer is described as 'A minimal breathing exercise meditation timer. Supports the 4-2-4, 4-7-8, box breathing @4 seconds, and HRV breathing exercises' and is an website. There are more than 10 alternatives to Online Breathing Timer, not only websites but also apps for a variety of platforms, including iPhone, Android, iPad, Mac and Windows apps. The best Online Breathing Timer alternative is BreathePulse. It's not free, so if you're looking for a free alternative, you could try Ice Breath or Inner Breeze. Other great sites and apps similar to Online Breathing Timer are MindBreath, One Deep Breath, Oak - Meditation & Breathing and The Breathing App.