Ventures
Build ittogether.
21 Arrows is a firm with a venture studio inside it. Client work runs on the same product discipline and code standards our own companies are held to — every build treated like something someone will live with for ten years. And when an idea deserves to be a company, we're open to building it alongside you and sharing in what comes next.
Start a projectThe studio
We chase arithmetic, not ideas.
Every company we start begins the same way client work does: a real operating problem, a map of where the hours and margin go, and a build that has to pay for itself. We don't chase ideas — we chase arithmetic that keeps showing up in business after business. When the same leak appears across an industry, that's not a project. That's a company.
The pattern
From your workflow to your next revenue line.
Here's the part most clients don't expect.
Say we build you a quoting engine, a scheduling brain, a compliance tracker — a tool shaped exactly to how your shop runs. It works. The hours come back, the errors stop. Then you're at an industry meetup and three competitors ask where you got it.
That's the moment we've designed the firm around. When a tool we build for one business turns out to be something its whole industry needs, we don't just send a final invoice — we offer a partnership:
You bring the domain.
The credibility, the industry knowledge, the first proof that it works.
We bring the company.
Product, engineering, design, go-to-market — the studio stands the business up.
We own it together.
The tool that fixed your operation becomes equity in a software company — a revenue line that has nothing to do with your headcount.
Your operations problem might be your next business. Most firms would never tell you that. We're structured for it.
What makes a spinout
Not every project should become a company.
We'll be straight about which is which. The bar:
It solved a real cost in a real business
Yours, measured, not hypothetical.
The problem repeats across an industry
The same leak in fifty shops, not a one-off quirk.
An operator wants in
The best vertical software companies are half domain, half product. That first half is you.
For educators
The Teacher Brain — built for the people who run the classroom.
The Teacher Brain is our mobile platform for educators: practical classroom tools and teacher wellbeing support in one place. It's designed around the real shape of a school day — the planning, the tracking, the hundred small decisions — instead of asking teachers to adapt to software built for administrators.
The platform is in development now. Teachers, school leaders and education organizations who want to hear when it launches — or shape what it becomes — are welcome to reach out.
Get launch updatesClassroom tools that save the period, not just the paperwork
Built for use in the room, in the moment — fast enough to matter between classes.
Teacher wellbeing, treated as infrastructure
Support for the educator behind the lesson plan, not another dashboard to maintain.
Shaped by working educators
The roadmap follows what teachers and schools actually ask for — which is why we're talking to them early.
Arrows in flight
The companies we're building.
More arrows in flight — a sample of recent builds
Add9
Applied AI and agentic aggregation.
The Teacher Brain
A mobile platform for educators — classroom tools and teacher wellbeing in one place.
Start a project
Build something bigger than a project.
Start with the assessment. If what we find is a company, you'll hear it from us first.