Kalenux is a software powerhouse founded in 2021. Our team of senior engineers, domain researchers, and product specialists builds platforms that millions of people trust, tools that enterprises depend on, and products that define their categories.
Not demos. Not prototypes. Every product is a live, production-grade platform built by specialists who understand the domain from the ground up - researched, engineered, and battle-tested at scale.
whennotesfly.com
WhenNotesFly is Kalenux's editorial publication for in-depth, expert-written reads on concepts, technology, culture, work and skills, and ideas. Articles are primary-sourced and built to hold up over time. Built with Go, PostgreSQL, Redis, Docker, and a multilingual publishing workflow.
The most rigorous free IQ assessment on the internet. Developed with psychologists and cognitive researchers to measure 10+ cognitive domains with real breakdowns, percentile rankings, and adaptive difficulty. Available in 15+ languages and trusted by users who demand more than a parlor trick.
The file converter that privacy professionals actually use. 30+ formats, zero uploads, 100% client-side. Your files never touch a server. Engineered by our security team and trusted by 100,000+ users every month who refuse to hand their documents to a stranger's cloud.
For professionals who can't afford to fail. Expert-written study guides, adaptive practice tests, and interview playbooks for AWS, Azure, CompTIA, Cisco, and more. Built for the people who need a pass, not a participation trophy.
The authority on specialty coffee and work-friendly spaces. Curated by people who actually know their espresso from their cold brew. Detailed venue profiles, expert-written guides, and filtering that finds you the right table in any city.
The internet's most obsessive wildlife content platform. Deep expert-written dives into the most bizarre, extreme, and extraordinary animals on Earth - mammals, reptiles, marine life, insects, and beyond. Content that makes people stop scrolling.
The professional writing resource serious communicators rely on. Expert-written templates, grammar mastery guides, business writing playbooks, and deep-dive tool reviews. When the email, proposal, or letter matters - this is where you start.
The definitive guide to starting a company anywhere in the world. Country-by-country formation playbooks, corporate tax breakdowns, free zone comparisons, and compliance checklists - written by experts who've navigated the actual process.
The QR tool businesses in 40+ countries actually run on. QR, Code 128, EAN, UPC, Data Matrix - all formats, custom styling, camera scanning, and CSV batch mode for teams that print at scale. Offline-capable as a PWA. Built for ops, not demos.
From single landing pages to complex, distributed multi-service architectures - our senior engineers, designers, and domain strategists own the entire process, from first spec to production deployment and beyond.
Full-stack platforms engineered to scale from day one. Our team ships production-grade web apps - landing pages to complex SaaS - using React, Next.js, Go, and Node.js. Architecture decisions are made by senior engineers who've shipped products with hundreds of thousands of users.
5 published apps. 60,000+ downloads. Our mobile team has shipped real products on Google Play - not test apps, not internal tools. We handle every layer: UX design, native Android, React Native, Play Store submission, compliance, and post-launch. Results, not releases.
Backends that don't collapse under pressure. Every API we build is production-ready: proper indexing, Redis caching, structured logging, and Docker orchestration from the first commit. Built to absorb real traffic, real failures, and real growth - not just to pass a demo.
A single week with the right senior engineer can save months of the wrong direction. Architecture reviews, deep code audits, and strategic technical guidance from principals who've built and scaled real systems. Talk to someone who's solved the problem you're about to have.
Every project is led by a senior Kalenux engineer. No account managers, no outsourcing, no handoffs to anyone. You work directly with the people building your product.
Founded in Istanbul in 2021, Kalenux is a multidisciplinary powerhouse of engineers, domain researchers, product designers, and specialists who build software that hundreds of thousands of people depend on daily. We don't just write code - we solve real problems with the depth they deserve.
Our team spans the entire stack: Go, React, Node.js, Python, Java/Kotlin for Android, PostgreSQL, Redis, Docker, and AWS. For every product we build, we go deep into the domain - working with psychologists for our cognitive platforms, content strategists for our editorial properties, and security engineers for our privacy tools.
We also contribute back. Kalenuxer, our in-house Node.js build framework, powers every Kalenux web property and is publicly available to the developer community. We build tools we believe in, and we share them.
A Node.js-based website build system powering all Kalenux projects. Template-based, multilingual, incremental builds, and automated deployment - built in-house because nothing else did everything we needed.
Only rebuilds changed files - CSS, JS, and HTML are tracked separately with timestamp-based invalidation. On large sites this cuts build time from minutes to seconds.
Built-in i18n with JSON data files per language, supporting 15+ languages without any external dependency or translation service. Adding a new language is a matter of adding a JSON file.
Component includes, variable substitution, and automatic minification are all built in with no plugin configuration required. Reuse headers, footers, and any partial across an entire site from a single source file.
SSH/SCP deployment scripts handle build, sync, and ship in a single command - with separate modes for frontend-only changes and full container rebuilds. No CI service required for small teams.
Kalenuxer-built frontends integrate natively with Go backend templates, allowing server-side rendering with Go's html/template package alongside the static build pipeline. This makes it straightforward to mix static pages with dynamic, data-driven routes.
Every figure below is a live product in production. Not a demo. Not a stat inflated by a marketing team. Real users, real traffic, real scale - built and maintained by our team.
Kalenux is the force behind every one of these products. Each was conceived, engineered, and deployed entirely by our in-house team. No outsourcing. No white-labelling. No shortcuts. We build what we stand behind - and we keep standing behind it in production.
From solo developers to enterprise teams managing global logistics - what real users say about what Kalenux actually delivers.
"The IQ test is the most thorough free assessment I've found. The domain breakdown actually tells you something meaningful, not just a single number. I've recommended it to everyone on my team."
"File Converter Free is the only tool I trust with sensitive documents. Knowing the files never leave my browser is a game-changer for our compliance team. Clean, fast, and it just works."
"We use the QR tool across our entire retail network for product labelling and campaign tracking. The batch CSV mode alone saves us hours every week. Genuinely enterprise-ready."
"When Notes Fly is my go-to for staying sharp. The depth of content and the way it's organized across topics is unlike anything else I've read regularly. It's clearly built by people who actually read."
"Kalenux built our entire platform from scratch. What impressed me most was how they handled complexity. The architecture was clean, documented, and we could hand it to our own devs without issues."
"The QR Scanner app has over 50K downloads for a reason. It's fast, offline-capable, and handles every format I throw at it. No ads, no nonsense. Exactly what a utility app should be."
Whether you need a platform built from scratch, a specific system engineered by specialists, or honest senior technical direction - our team is ready. Every message gets a real response within one business day, from a real engineer, not an automated queue.
No sales pitches. No account managers. Direct access to the people who will build your product.