Hello HN!

I'm relaunching Radius [1] - far too long after the original Show HN [2] (I'll blame the day job for that).

Radius started out from my frustration with not knowing what was going on around me. The initial plan was to "show all and every type of event" from big to small, but over time I narrowed the focus to communities, groups, events, and helping people connect through them.

The initial Show HN gave me 150+ comments (surprising, looking back, given how terrible the plain Bootstrap UI was...) with a huge amount of useful feedback and feature requests. I've spent the time since then working through that, along with additional requests from groups using Radius, and it finally feels ready for a proper relaunch.

I've also recently added "Activities" [3] - which are lightweight events, independent of groups, intended to help people find others to do things with - for example:

> John is going for a cycle and a coffee in New York at 10am

People can join and vote for a time that works for them.

I've got a bunch of ideas for where to go next with this, including things like open sourcing and federation, but those are for another day!

Any feedback would be greatly appreciated!

P.S. it's built with Ruby on Rails, for those interested. I highly suspect it would have taken me 2 more years to get to this point without Rails!

[1] https://radius.to/

[2] https://news.ycombinator.com/item?id=40717398

[3] https://radius.to/documentation/activities/post-an-activity

user:	VeryGoodMorning
created:	September 20, 2026
karma:	2