Kotlin vs Java: Which is the Best Language to develop your mobile app in 2020?

  • Anita Gigoo
  • Apr 20, 2020

Kotlin vs Java: Which is the Best Language to develop your mobile app in 2020?
Anita Gigoo Mobile App Development Apr 20, 2020 877

While creating a mobile business device, Android is a popular tool for a variety of developers because of its incredible benefits. Some of the benefits this model provides include low investment, strong ROI, a large user base and quicker delivery period.

And because of Android's positive influence on business growth, a range of aspiring business people plan to develop an Android app that incorporates up-and-coming technologies and makes mobile app cost lesser for everyone.

Nevertheless, it is still a mystery what programming language to use when creating an Android app. particularly two programming languages are used to build an Android app–Java and Kotlin.

Java is an ancient player in Android although Kotlin was published by Jetbrain in 2011. In the last few years Google declared it as the official language for Android application development, the Kotlin-against-Java battle begins as Kotlin was tracked among the developers. Nonetheless, in the near future, Java can be fully replaced.

But right now, what programming language should you choose to build your business application? Let's get to know the players first to find an answer to this question.

What is java?

Java is a general-purpose PL which follows the rule OOP and Write Once Run Anywhere. Java is used to develop phone, cloud, business, and mobile apps. Nevertheless, it is not a language alone. The Java development kit, Java Runtime Environment and integrated development environment are a resource set that encompasses almost all of what you might need for Java creation.

Wherever you go, Java can be downloaded. It is the language of Android creation but is used in web apps, shared software and big data technology such as Apache Storm and Hadoop. It can also be used for high-end projects involving new technologies, such as the analysis of natural languages, machine science, and IA.

Advantages of Java

  • It is easy to understand.
  • It can be worked in a virtual machine or browser window that is beneficial during application reuse.
  • To cross-platform applications it is great.
  • Android SDK adds a lot of Java application libraries to its support.
  • It is a large open-source platform, as the JVM or Java virtual machine is implemented by Google.

Disadvantages of Java 

  • The limitations of the architecture of the Android API can trigger mistakes.
  • The risks of glitches and failures increase significantly due to the addition of code lines in Java.
  • Java is a bit slow and takes a lot of memory in contrast to other programming languages.

What is Kotlin?

Kotlin is a JVM (Java Virtual Machine) programming language and can, therefore, be found everywhere that Java is used today. It involves the creation of software, computers, websites, and iOS. This is developed by JetBrains, which is trying to make Kotlin a one-stop-language solution for all the apps and also embedded frameworks.

The simple language architecture and amazing capabilities of Kotlin render it so popular among developers. This strives not merely to introduce new ideas in development, but to integrate programming language functionality beneficial to large-scale businesses.

It's a combination of both practical and object-funded functionality, which is one of the best things about this term. For the production of a wide range of applications, Kotlin can be used from the server, consumer or Android hand.

Advantages of Kotlin

  • For designing stable APIs, Kotlin has use robust extension functions.
  • It has none in its type scheme, which is Java's biggest suffering.
  • Similar to Android, it is more succinct.
  • The Java-Kotlin hop is simple.
  • With the aid of IDEs, developers in Kotlin can efficiently write.

Disadvantages of Kotlin

  • Compared to Java, its compilation pace is a bit slow.
  • Kotlin applications aren't lightweight.
  • It's a little difficult to find a competent Kotlin creator.

Now that we know what Java and Kotlin are, and what their benefits and inconveniences are, let's speak about which device you need to create.

Java VS Kotlin

Altogether, in a number of situations, Kotlin is like Java. But when we equate Kotlin to Java explicitly, the variations are more obvious. To see which language you should use when building your mobile application, the following are several considerations in a detailed analysis of these two programming languages:

1. App Performance

Software efficiency is largely based on a number of variables, such as the complexity of the operating system for which it is built, the consistency of the application, the developer experience, etc. By contrasting Kotlin and Java, they are almost on the same basis by evaluating the performance of apps built-in. There is no big difference since they have the same bytecode layout.

2. Android Studio 3.0 Support

Java is not that popular in the Android ecosystem. Android Studio 3.0 supports Java 7 successfully and some Java 8 functionality, but the current Java release is SE 10, with Android Studio software.

As a result, app development firms are more geared towards Kotlin as the promise of the latest versions is fully appreciated. Android studio also is based on Kotlin's marvelous JetBrains ' IntelliJ IDEA.

3. Code Quality

Concision is one of the strengths of Kotlin. For fewer lines of code, you get more features. Therefore, the less coding you use, the fewer errors you create.

In Java, though, it is difficult to make sure you compose such a broad code in order to do a simple job.

In Kotlin, you only need to write a single line of code if you have to write the same function.

4. Popularity

Java is the most common programming language according to the TIOBE index for February 2019, because of the numerous advantages it offers but the top 20 programming languages are not in Kotlin anymore.

Tiobe takes into account factors such as online training, the number of technically designed developers worldwide, and third-party suppliers when describing the most common programming languages shown above.

5. Adoption Cost

Kotlin is open source and can be used free of charge. Only by converting the language using a converter will you begin exploring. In all Java frameworks and libraries, even those that rely on the compilation of annotations, Kotlin is compatible. It also incorporates magnificently in construction devices such as Maven, Gradle, Ant or Kobalt. You only need a Kotlin module to add.

Kotlin is quick to get going and can be quickly applied to existing businesses, which means retention of your current technology expertise and expenditure.

6. App Security

Kotlin implementations are considered safer and stable without the possibility of an interface crashing as a consequence of NullSafety. Application Kotlin is simpler than application Java, as it avoids routine programming bugs, which results in fewer glitches and computer crashes.

Many bugs and failures are bound to occur when using Java. Kotlin allows developers to take their design directly into consideration potential issues, which will now enable them to develop stronger technology.

7. Support for Complex Structure

While designing complicated applications, the amount of code needed can be served far more by Java than by Kotlin.


Nonetheless, the final response to which is best between Java and Kotlin is to start digging in both languages, to talk on the two sides of Kotlin vs Java. It is focused on the specifics of your project. There are programs in which Kotlin is equivalent to Java and the contrary.

At Mobileappdiary we provide you updates consistently about Java and Kotlin which will help you achieve your goals at a fair mobile app development cost.


  • Anita Gigoo

    Anita Gigoo

    Apr 20, 2020

    Anita Gigoo is a Senior Content Writer at Mobileappdiary who has written on various topics related to mobile app development, Mobile app design, web development, and social media platforms for the past 5 years. Having a strong academic background in writing makes her a creative, sharp, thoughtful, and intellectual writer. Being an expert she loves to explore new ideas related to mobile technology.

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