J20 Labs

Where the apps come from.

J20 Labs is the workshop behind J20 — the place where ideas become apps that feel inevitable. Native where it counts, cross-platform where it helps, shipped in the open.

See what we're building

The stack

Tools we reach for.

Pragmatic, native-friendly and cross-platform. The right tool for each screen — not one hammer for every nail.

Flutter

Dart

Swift

Kotlin

KMP

Java

How we build

A few rules we don't break.

Small team, high standards. These keep us honest.

Native where it counts: Platform feel isn't a nice-to-have. We respect each OS instead of flattening them.
Cross-platform where it helps: Shared logic with KMP and Flutter so every platform moves together, faster.
Details are the product: Motion, empty states, the second-order moments — that's where good becomes great.
Ship in the open: Public roadmaps and shipping logs. Less mystery, more momentum.

From idea to ship

How an app gets made.

01Sketch: We chase one sharp idea and prototype it until it earns its place.
02Build: Cross-platform foundations, native polish, tight feedback loops.
03Ship: Out the door early, improved in public, owned through your J20 account.