Notes that became guides.
Nuvyreqox is a small, independent publisher of PDF guides to Kotlin. We don't have a course platform, a certificate, or a community forum — just guides, written to be read once and kept as reference.
Where this started
The first guide we wrote was for two developers moving from Java to Kotlin mid-project. Most tutorials we found either treated Kotlin as a shorthand for Java or jumped straight to coroutines without covering what came before. We wrote something more deliberate instead, and kept doing that as the topics got harder.
What we actually sell
Ten PDF guides, priced individually, covering Kotlin from your first script through to generics, inline functions, and Kotlin Multiplatform. Nothing is bundled behind a subscription, and nothing is sold on urgency — the catalogue looks the same today as it will next month.
What we don't promise
We don't promise a job, a salary figure, or a timeline for "becoming a Kotlin developer." What each guide promises is narrower and more honest: a specific set of topics, explained clearly, with working code you can run yourself.
A small detail
We set code and prices in JetBrains Mono — the typeface JetBrains, Kotlin's creator, designed and released for free. It felt like the right typeface for guides about their language.
How the guides are written
Every guide starts as working code, not prose. We write and test the examples first, then write the explanation around them. If an example doesn't run cleanly on a current, supported Kotlin release, it doesn't go in the guide.