Kalenux is a software powerhouse from Istanbul, founded in 2021. We build, ship, and operate production-grade products: 10+ live platforms used by 500,000+ people across 40+ countries, on both web and mobile.
Here is how a focused team builds and runs a portfolio that most companies would split across several departments.
The numbers
- 10+ products in production — live platforms, not demos
- 500,000+ users worldwide
- 40+ countries reached
- 5 published Android apps, 60,000+ downloads
- 15+ languages per content product
- 99.9% uptime
The portfolio
Every product is a live, production-grade platform built by specialists who understand the domain from the ground up:
- When Notes Fly — an editorial publication for in-depth, expert-written reads. Go, Gin, PostgreSQL, Redis, Docker, multilingual.
- Whats Your IQ — a rigorous, research-backed IQ assessment measuring 10+ cognitive domains, in 15+ languages.
- File Converter Free — a privacy-first converter: 30+ formats, 100% client-side, zero uploads. 100,000+ users a month.
- Strange Animals, Down Under Cafe, Evolang, Corpy, Pass4Sure — content and discovery platforms, each authoritative in its niche.
- QR & Barcode Tool — a PWA running in 40+ countries: all major formats, camera scanning, CSV batch mode.
Different domains, different stacks where it matters — mostly Go + PostgreSQL backends, with client-side WebAssembly tools where privacy demands it.
The leverage: our own build system
Much of the portfolio ships on Kalenuxer, our open-source, Node.js-based website build system. It is template-based, multilingual, and does incremental builds — only rebuilding the files that changed. On large sites that cuts build time from minutes to seconds. We built it in-house because nothing else did everything we needed.
That tooling is part of why a focused team can run this many products without drowning in busywork.
Build to lead, not to demo
Our products are meant to lead their categories. That means shipping things that are correct, fast, and maintained — and being the team that actually operates them in production, at scale, for the long run.
Software that works. Products that last.
Kalenux is a software powerhouse from Istanbul building web and mobile products at scale, and the open-source Kalenuxer build system. Founded and led by Emir Baycan. kalenux.com.tr
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