Yes, it DOES stop showing you as online. If you are not sharing your last seeen&#x2F;online status with somebody, he will NOT see you online, regardless of the app they are using.<p>There is one exception to this: people will see you online for a brief period of time right after you send THEM a message (otherwise it would feel like talking to a wall).<p>See: 
<a href="https:&#x2F;&#x2F;telegram.org&#x2F;faq#q-can-i-hide-my-last-seen-time" rel="nofollow">https:&#x2F;&#x2F;telegram.org&#x2F;faq#q-can-i-hide-my-last-seen-time</a>
And: <a href="https:&#x2F;&#x2F;telegram.org&#x2F;faq#q-who-can-see-me-online" rel="nofollow">https:&#x2F;&#x2F;telegram.org&#x2F;faq#q-who-can-see-me-online</a>