Crux is the Southern Cross. It holds its shape while the rest of the sky turns, and it points true south when nothing else will. Crux is also the ordinary word for the heart of a hard problem, the one point everything else turns on. We build one thing: Pinly, a social platform for schools that leaves out most of what makes social platforms work.
We didn't pick the name for the sound of it. Crux carries two old meanings, and a company sits exactly where they meet.
Smallest of the eighty-eight constellations and the brightest thing in the southern sky. For a thousand years of sailors, drovers and night walkers below the equator, Crux was the one you trusted. Run a line through the long axis, Gacrux down to Acrux, and it shows you south. No compass needed.
From the Latin for cross, and by way of the hard places, the point a whole matter turns on. The crux of the argument. The knot you have to untie before anything else can move. It's where the difficulty lives, and it's where the difficulty gets solved.
Cruxworx is the bench where those two meet, and where the instrument gets made. At the moment it's making one, for what we think is the hardest room to get right: the one where children are learning how to be around each other.
Pinly is a closed social platform a school runs for itself. Families are added by the school, so a child can never make their own account, and nobody outside the school can see in or search for a pupil. Inside it's ordinary: a class feed, messages, notices, a calendar, homework. The interesting part is what isn't there.
Something goes up on the board, the people in that room see it, and it comes down. That's the whole shape of it. Pinly gives a school somewhere its pupils can talk, share work and organise themselves, inside walls the school already knows how to supervise.
Adults are present and pupils are told so plainly. Conversations involving a learner are overseen, guardians can read their own children's messages, and photographs have their location data stripped before anyone sees them.
pinly.cruxworx.com →None of these are oversights. Each one was built somewhere else on purpose, and we didn't copy it.
One tap that sends warmth, with no number attached to it. The affection survives. The scoreboard doesn't.
You get to the bottom and it tells you you're all caught up. Then you put the phone down and go and do something.
There's no repost and no forward, so a post stays in the room it was made in. Take it down and it's actually gone from the community.
A child can name everyone who saw it. That's what makes a mistake survivable, and what makes an apology possible at all.
If Pinly is deliberately small, what does it amount to globally? It's a fair question, and the answer isn't the usual one about reach.
The thing we're copying already exists in every country on earth. Not the internet: the playground. Small enough to see across. A set of faces you know. Finished by home time. Adults nearby who know both children. The internet took the playground and quietly removed all four of those properties. Every school already knows how to run one.
The machinery is the same wherever you go. A child in Windhoek, Lima or Leeds opens the same counter, the same feed with no bottom, the same message from someone they've never met. Childhood is local, but the thing acting on it isn't, which is why the answer doesn't have to be reinvented in every country either.
Most platforms get bigger by joining communities together until they're one enormous one. Pinly goes the other way. Every school is sealed off from every other school, so a thousand schools using Pinly is a thousand separate rooms rather than one big one. The network can grow while no room ever does.
Nothing about a child travels between countries. What travels is a standard: a feed that ends, warmth nobody counts, an audience a child can name, and an adult in the room who is known to be there. A school anywhere can hold that room in its own language, under its own rules, on its own terms.
We'd rather have one product we can defend line by line than four we can only describe.
We don't publish a safety claim the software doesn't yet deliver. If a piece is still unfinished, it stays off the website until it isn't.
Nothing in Pinly is built to keep a child there a minute longer than they meant to stay. The quiet is the feature.
Parents pay for Pinly, so there's nobody in the room with a commercial reason to argue against the child.
Plain, durable stacks and code we own outright. No black boxes, and nothing we couldn't still reason about in ten years.
A studio that answers its own email. When you write to Cruxworx you reach the people who built the thing, not a queue.
Cruxworx is a small independent studio. It has built a number of things over the years. Pinly is what it's building now, and for the time being it's the only one.
That's deliberate. A school platform is either safe in the way it's put together or it's just marketing, and getting the structure right takes all the attention there is. So the rest came down and this one stayed up.