Say bye to unrealized plans and sitting bored at home


Make most of your free time!

Share your plans. Join your friends.

Traveling? Joinstar shows your friends' plans in the destinations you are going to visit.


Wanting to check out a new sushi cafe? Joinstar makes it easy for your friends to join.


Planning a jog in Central Park this Sunday morning, but your roommates always sleep in? Joinstar finds you company.

Through Joinstar, within minutes, you receive a message from an old college roommate (who you didn't even know is in town this weekend!), your co-worker's cute friend from the office party last Friday, and a classmate, from the other side of the city, with whom you've been meaning to catch up for ages!


Say bye to unrealized plans and sitting bored at home.

Join Joinstar - having a full social calendar has never been easier.




(917) 770-9817



New York, NY




Lillian founded Joinstar while studying Economics at Harvard. The idea was born during her last semester at the university, so called 'Senior Spring.'

"There were so many things I wanted to do in Boston before graduation, and with only few weeks of school left, I needed something that will give me a fast way to let my friends know what I am up to and give them an easy way to join me."

Joinstar is the solution.

"I also find Joinstar super useful while traveling. 

Before I would post I am going to LA on Thursday on Facebook and my post would quickly disappear on my friends' crowded "walls." "

Joinstar is the solution.

Now, a true New Yorker, Lillian lives by the motto: "OK, but first coffee!" She also self identifies as a chocolate enthusiast.

Reach Lillian at:

@LillianAdams_Official on Instagram

@LillianAdamsO on Twitter

Lillian Adams on Facebook

Want to know what Lillian and our team is up to?


Add save us in your address book and we will show up on your Joinstar




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