OrangeX.com supports custom drawing of K lines on iOS and Android apps. The steps are as follows:

 

Step 1: Download here to download OrangeX.com's latest iOS and Android apps

 

Step 2: Log in to OrangeX.com account in app

 

Step 3: Select the cryptocurrency pair you want to trade and click the maximize icon on the bottom right.

 

Step 4: Bottom right"✏️" icon.

 

Step 5: You can write on the chart by selecting what to draw on the right bar.