Hackathons
A hackathon that ends in a company, not a demo. Experts run go-to-market and validation workshops across the weekend, so you leave knowing whether the thing works and how to sell it. It's a place to learn.
Win the hackathon. Then what?
[ About Us ]
We close the gap between a hackathon project and a real company. Most hackathons end with a demo and nothing after it. Ours are built to send teams out as startups.
A place to learn
Experts run go-to-market and validation workshops across the hackathon, so teams leave knowing whether what they built has a market and how to reach it.
A place to build
The strongest teams then move into a house together, with a coworking space, a first check, and mentors and investors who have built companies themselves.
© 2026Copenhagen / Sweden
[ Our Past Hackathon ]
Hackathon for hackathon winners
Held in Malmö for people who had already won a hackathon. One big room of talented builders, and the question of what comes after the demo.
What We Do
Hackerhouse
The strongest teams move in and keep building together, with a coworking space of their own. No equity just to get in the door.
Mentors and investors
Go-to-market, validation, and the things that quietly kill a good product, worked through with founders who have built companies themselves. The investors who back them are in the same room.
Co-founder matching
Come without a team and leave with one. We hold a network of builders, startups and investors, and introduce the ones that fit, in every direction.
The community
Pitch nights, founder dinners and workshops. The network doesn't end when the house does.
Copenhagen
Get in before the first one.
Name and email is enough. You'll hear about the city, the dates and the house before any of it is public.
What is 21 Moons?
We run hackathons built to produce companies instead of demos, with go-to-market and validation workshops run by experts. The strongest teams then move into a house together, with a first check, mentors and investors behind them, and a community that stays after. The short version: we're what happens after the hackathon.
What's your mission?
To close the gap between a hackathon project and a real company. Hackathons are good at finding talent and bad at doing anything with it, and accelerators arrive too late. We take the strongest teams straight from the hackathon and give them a place to build, a first check, and people with real experience behind them.
What's your vision?
A Nordic community where startups, talented people and investors are all in one place, so talent has a real path to starting a company instead of going to waste. Every founder we get off the ground adds to the Nordic economy.
Why does 21 Moons exist?
Because good projects die after hackathons. One of us built something real at one and watched it fall apart afterwards, not for lack of talent, but for lack of anywhere to take it next. 21 Moons is that next place.
Why the Nordics?
Too many good ideas die here after a hackathon, or leave the region to get built. A house with a real network and money behind it gives people a reason to build at home, a community to belong to once the weekend ends, and a reason for talent abroad to come here.
Who can apply?
Anyone building something. We read every application, and what matters is what you've made, not where you studied or how long you've been at it.
Does it cost anything to attend?
No, the hackathons are free to attend.
Where is this happening?
In Copenhagen and Sweden. We'll announce the exact city, venue and date soon.
I'm a startup or an investor, not a builder.
Still relevant. We keep a network of startups, talent and investors and introduce the ones that fit. Email us and say what you're looking for.