Use the same account on another device
Yes. Your Chatex Pro subscription is tied to your account, not to one device. Sign in with the same account in your browser on desktop, laptop, tablet, or mobile browser to access your subscription.
Chatex is a web app. There is no official Chatex mobile app in the Apple App Store or Google Play Store.
If access looks different on another device, first confirm that you signed in with the same account email.