The space for builders.
Not an accelerator. No strings attached. Just the right people in one room — Based in Berlin.
Build alongside the best. Compute credits. Network of builders, companies & investors. No equity, no program — just the room.
Proud partners of The Sandbox
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The Space for Builders
The Sandbox is not a cohort. Not an accelerator. No equity, no program, no strings attached.
It's a physical space in Berlin where the right people show up and build — in the same room, at the same time. No fixed intake dates. No lock-in. Just builders building alongside other builders.
Europe is missing proximity of ambition
In Europe, ambition is distributed.
Even in cities like Berlin, the most driven founders rarely know each other.
They build in isolation, often surrounded by people who don't share their urgency.
Eventually, many leave — not because they want to,
but because it feels like the only way to find peers who think as big as they do.
We're changing that. A place where ambition has a home.
Where the next generation of global companies can start here —
because the right people are finally in one room.
Just the right people in one room
There should be a place where, at any given time,
serious technical founders are building next to each other —
working, arguing, sharing progress, and raising each other's bar.
Proximity matters.
It's the invisible multiplier that turns ideas into companies —
and companies into movements that reach far beyond one city, one country, one continent.
In San Francisco, you feel it everywhere.
In Europe, The Sandbox is that place —
a shared space where global ambition gets built, together.
What The Sandbox is
The Sandbox is a physical space in Berlin for builders —
people building the future, whether they've raised money or not.
What it offers:
No cohort, no dates — join when you're ready
No fees, no equity — no strings attached
Access to credits and support from partners like OpenAI and Runpod
Dinners with exited founders and visiting guests
Direct connection to the broader {Tech: Europe} network of builders, talent, and investors
A place where everyone around you is obsessed with making something new — and building with global ambition from day one.
Who it's for
Builders who have:
The ambition to create something new
The technical ability to build it
The drive to bring it to market — anywhere in the world
Solo or in teams — both possible.
We care about who's in the room, not when they started.
The kind of people who say: it has to happen now.
If this resonates — if you want to be in the room with the right people, with no program and no strings — The Sandbox is for you.
Why should I join?
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The best builders move faster when they're in the same room. The Sandbox is that room — no program, no cohort, no strings. Just the right people building alongside each other.
What do I get?
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A desk in Berlin. Serious builders around you. Compute credits. Warm intros to investors and founders. Dinners with people who've done it before. No equity taken, no lock-in.
Who is it for?
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Builders. People who ship. Doesn't matter if you're pre-idea or already scaling — what matters is you want to build and you want to be around others who do.
What makes it different?
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We're not an accelerator. No equity, no program, no pitch days, no fixed cohort. Just a space where the right people show up and build. No strings attached.
When can I apply?
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Applications are always open. No cohort dates — join when you're ready. We care about who's in the room, not when they started.
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