Read at your pace
PDF chapters let you move between an explanation and an example without following a class schedule.
A library for the Kotlin curious
Small concepts.
Thoughtful
code.
Get to know Kotlin through written guides, annotated examples and room to practise. From your first val to the shape of an application.
PDF formatEnglishYour own pace
A CLOSER LOOK AT THE LANGUAGE 01 / 10
Ideas into expressions
// A place to begin.
val language = "Kotlin"
fun explore(topic: String) {
println("Learning $topic")
}
explore(language)↳ Learning Kotlin
{ }
Read the idea.
Try it in code.
↗Try it in code.
Built around the languageval & varfun()String?List<T>suspend{ practice }
01 / Our approach
Understand the idea.
Then work through the code.
Voryqelto is a collection of focused Kotlin study guides. We connect language concepts to small, readable examples, then give you questions and exercises to work through in your own time.
More about our approach02 / The collection
Find your next
line of thought.
Begin with the basics or look closer at a particular topic. Each guide has its own scope and prerequisites.
Loading the collection…
All prices are in EUR. One-time purchases. Review any applicable tax and the final total on the payment page before confirming.
03 / Made for independent study
A little structure
for your study time.
Written materials you can pause, annotate and revisit as you work through a topic.
See the reasoning
Annotated examples explain the role of a language feature and the choices made in the code.
Put ideas to work
Practice prompts ask you to change an example, predict its behaviour or model a small problem.
Know the scope
Review the modules and prerequisites before you choose. Each guide is a separate purchase.
A first page, at no charge
Curious about Kotlin?
Free Kit introduces values, types and a first function.
Read the outline and see where it begins.
What do I receive?
Each item is an English-language PDF guide with explanations, annotated code examples, practice prompts and review notes. The module list on the guide page describes its scope. These are written materials, not live classes or individual tutoring.
Where should I begin?
Start with Free Kit if Kotlin is new to you. For a longer introduction, read the Axis Guide outline. Every guide lists its prerequisites so you can choose by topic rather than price. You do not need to buy earlier guides.
How are the materials delivered?
We email the PDF or a download link to the address supplied with your order within two business days after payment is confirmed. There is no physical shipping or delivery charge. Check your spam folder, then contact us if the delivery has not arrived.
Is this a subscription?
No. Each paid guide is a separate, one-time purchase in EUR. There are no recurring charges. Free Kit is listed at €0 EUR and does not begin a paid subscription.
Can I read the guide offline?
Yes. Save the delivered PDF on a device with a PDF reader. Practising the code requires a suitable Kotlin development setup; development tools are not included with the guide.
What if I need a refund?
You can request a refund within 14 calendar days of purchase, including if you have opened the PDF. We also review missing deliveries, duplicate charges and faulty files. See the refund policy for the process and timing. Your statutory rights are unaffected.