Launches
Coming soon
Upcoming launches to watch
Launch archive
Most-loved launches by the community
Launch Guide
Checklists and pro tips for launching
Products
News
Newsletter
The best of Product Hunt, every day
Stories
Tech news, interviews, and tips from makers
Changelog
New Product Hunt features and releases
Community
Discussions
Ask questions, find support, and connect
Streaks
The most active community members
Events
Meet others online and in-person
Advertise
Subscribe
Sign in
Po-Shen Loh
Expii + Natl Math Olymp coach + CMU prof
#337857
131 followers
26 following
20 points
Follow
About
Activity
Upvotes
1 Hunted
Collections
Stacks
Reviews
Links
Website
Twitter
Badges
Veteran
Maker History
NOVID
Anonymous contact tracing to prevent the spread of COVID-19
May 2020
Expii
Learn with the world
Jan 2016
🎉
Joined Product Hunt
October 28th, 2015
Report