Creately

Mobile app +web portal were you can draw UML and diagrams

Screenshots

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Hunter's comment

i have tested this web platform for my university projects and its very easy to use and very handy sometimes when you don't want to work on laptop you can make diagrams , UML,sequence diagrams etc on mobile app as well.i have made a sample so you can demonstrate how easy it is to construct any sequence diagram on it.

its also provide real time work environment which is beneficial when work as a team.

Link

https://creately.com/home-2?utm_expid=.cHuBdfYkQkWh8MdV9CACrg.1&utm_referrer=