Beta
SPECIMEN 01 · COMMERCE
CatalogTree
Beautiful catalog pages for small shops, cafes and makers, with WhatsApp cart ordering. Your catalog, your checkout, live in minutes.
Lingdu Labs designs and builds web apps, mobile apps and websites, and takes on research projects, for startups, businesses and institutions. Like a fern uncurling along a Fibonacci spiral, every project starts as a small curl of an idea and opens into something real.
We build our own products, deliver digital projects for clients, and run serious research. Each branch makes the others sharper.
Web apps, mobile apps and SaaS products, designed, coded and shipped in-house, from idea to launch.
Digital work for clients: websites, mobile apps, custom software and research projects, for businesses, startups and organisations.
Mathematics, algorithms, data and open standards: work that's written up, cited and built to last.
We listen, sketch and figure out what's worth building.
A quick, working prototype you can actually click.
Design, build and launch, opening up one frond at a time.
Hosting, care and steady growth long after launch day.
Our own products and open specs, each one solving a real problem we bumped into.
Beautiful catalog pages for small shops, cafes and makers, with WhatsApp cart ordering. Your catalog, your checkout, live in minutes.
A deterministic GPIO pin-assignment solver for ESP32 developers. Tell it your peripherals; it finds a pin map that actually boots.
An open JSON format for medication schedules, so a prescription can move cleanly between apps, pharmacies and calendars.
Offline Emergency Peer-to-Peer Broadcast: a protocol for phones to pass alerts to each other when networks go down.
An open protocol for persistent, structured memory in AI coding agents, with a TypeScript reference implementation.
Beyond calories: a research-based way to see what food asks of your kidneys, liver, gut and hydration.
Mathematics, algorithms, data and open standards, worked out on paper first, then written up properly.
What happens to qn+1 when q is 7, 15, 31…? Patterns, cycles and proofs in progress.
A branching sequence of compositions that grows like a fern frond, with an OEIS entry.
New integer sequences, defined, computed and published for anyone to build on.
Taking "perfect numbers" into the non-commutative world of quaternions, and listing them for the first time.
Which numbers divide every zero-insertion, in every base? Extending a published base-10 result to a full classification.
MEDICS and OEPB written up as IETF Internet-Drafts, so others can implement them.
Whether you need a website, a mobile app, custom software or a research project done right, we take it from first sketch to finished, working product.
← websites, apps & dashboards, sketched
An app, a website, or a research question that won't leave you alone. Tell us about it and we'll get back to you.