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What is Kotlin?

Kotlin is crafted for user-friendliness, enabling developers to create powerful applications from the outset. Its seamless compatibility with the Java ecosystem allows the utilization of favored JVM frameworks and libraries without difficulty. Developers can easily share their application logic across various platforms, including web, mobile, and desktop, while providing users with a native-like experience. This method not only conserves time but also grants unrestricted access to features specific to each platform. The Kotlin community is robust, with a swiftly growing international network of contributors enhancing the language's capabilities. An extensive range of community libraries supports developers, readily offering assistance through various community channels or direct queries to the Kotlin team. For those developing mobile applications for both iOS and Android, Kotlin Multiplatform Mobile functions as an SDK, effectively combining the benefits of cross-platform development with native app creation. By keeping a single codebase for critical elements such as networking, data storage, and analytics, developers can optimize the creation process for their Android and iOS applications. This streamlining of development not only boosts productivity but also cultivates an environment ripe for innovation in various projects, leading to more efficient workflows and enhanced application quality.

What is Javalin?

In Javalin, classes are rarely extended, and interfaces are seldom implemented, reflecting the framework's minimalist approach. Built upon Jetty, Javalin comprises only a few thousand lines of code, which enables it to achieve performance levels comparable to Jetty's native implementation. Its concise codebase facilitates an easy understanding of the source material for developers. Unlike numerous other web frameworks in Java and Kotlin, which typically offer distinct versions for each language, Javalin is designed for seamless interoperability, allowing developers to create applications in a consistent manner across both Java and Kotlin. Operating on Jetty—one of the most trusted and widely used web servers for the JVM—Javalin provides extensive configuration options, including support for SSL, HTTP/3, and all the features inherent to Jetty. Additionally, while many lightweight web frameworks in Java and Kotlin often lack OpenAPI support, Javalin incorporates this capability, making it a more flexible choice for developers. This unique combination of features positions Javalin as an exceptional option for efficiently building contemporary web applications that can easily adapt to various requirements.

Media

Media

Integrations Supported

Alan AI
Axon Framework
Claude Sonnet 4.5
CodeConvert
DeepSeek Coder
ERNIE Bot
Falcon Mamba 7B
GPT‑5-Codex
Gemini 2.0 Pro
Gemini 3 Flash
JetBrains Datalore
JetBrains Projector
Klocwork
Llama 3.3
Llama 4 Maverick
Mesta
Paylode
ProGuard
Qwen3
Vert.x

Integrations Supported

Alan AI
Axon Framework
Claude Sonnet 4.5
CodeConvert
DeepSeek Coder
ERNIE Bot
Falcon Mamba 7B
GPT‑5-Codex
Gemini 2.0 Pro
Gemini 3 Flash
JetBrains Datalore
JetBrains Projector
Klocwork
Llama 3.3
Llama 4 Maverick
Mesta
Paylode
ProGuard
Qwen3
Vert.x

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Trial Offered?
Free Version

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Kotlin

Company Location

United States

Company Website

kotlinlang.org

Company Facts

Organization Name

Javalin

Company Website

javalin.io

Categories and Features

Categories and Features

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