Skip to content
Frank Marcantoni

I build the communities people can't stop showing up to.

Leagues, clubs, events, and the software behind them. I started a sports league in San Francisco that 25,000 people played in, then built the tech to run it. These days I'm using AI to make getting together in real life more personal, more whimsical, and a little more magical.

The short version

It all started with a sports league.

Friends playing kickball on a city field at golden hour
01

SF Social.

I met my wife playing in rec leagues, so when I moved to San Francisco in 2015, I started one. Soccer, hoops, volleyball, bocce, kickball, and the parties that made it a scene. More than 25,000 people joined in three years.

Friends laughing on a sailboat on San Francisco Bay
02

Social Sailing.

The one I loved most: sailing on the Bay. People who had never touched a tiller learning to crew together, and a league turning into something closer to a club.

Laptop on a sideline table during an evening rec soccer game
03

Rivall.

League software was built for youth sports, and the experience made no sense for adults. So I built software for how grown-ups actually play: registration that bends to teams, free agents and friends. SF Social was customer number one.

Crowd in matching jerseys celebrating with a trophy
04

Volo.

America's biggest adult rec sports company brought both into the family. I've been helping build it ever since.

Done badly, tech replaces the room. Done well, it fills it.

AI means we can finally build software for one league, one club, one event at a time. I want that software to get people off their phones and onto the field.

I specialize in using technology and AI to create magical in-real-life experiences.

What I make.

Team celebrating a trophy at a sports day

Events.

Tournaments, sports days and game nights people talk about for years.

Friends laughing on a sailboat on San Francisco Bay

Clubs.

Leagues and member clubs built from the first idea to the first season.

Laptop running league software on a sideline

The tech behind them.

Custom apps for signups, teams, check-in and the group chat, built fast with AI.

Friends talking around a coffee table with books and a vinyl record

Something smaller

Media Club.

What started as a book club is now open to books, TV, albums, movies—anything we want to get together around.

I'm building software just for our small group, using AI to make these evenings feel more special and add a little whimsy. A small thing, built to make the real-life thing better.

More of what I've built

Off the clock

I live on Bainbridge Island with my wife and our two boys. I play a lot of tennis, take poker too seriously, and I'm sketching a members club for the island.