Java Tech Popularity Index Q2/2023: Front-End Mobile

Summary for Q2/2023

Here is the scorecard of Flutter (100%), not on the card, vs. React Native (left) and Xamarin (right). The arrows show the trend vs. Flutter.

Flutter gains on its competitors in all categories but installed apps.

Here are my recommendations:

• Don’t build two separate applications with Apple’s and Google’s first-party frameworks. Use a cross-platform framework instead.
• If you already use Flutter or React Native in your project, keep using them. Otherwise, evaluate a migration. In many (most?) cases, such migration doesn’t make business sense.
• If you start a new project or migrate and have used React before, then start with React Native first and use Flutter otherwise.
• If you start a new project or migrate and have not used React, then begin with Flutter first and use React Native otherwise.

Archive

Table Of Contents

• Summary for Q2/2023
• Archive
• Applications
• Choices
• State of the Art
• Popularity
  • Why Popularity - and How?
  • Installed Base
  • Employers: Job Ads
  • Developers
    • Students at Udemy
    • Google Searches
    • Questions at Stack Overflow
• Analysis

Applications

These recommendations are for building native enterprise applications on iOS and Android - forms, data grids, reports. They are not for games or media applications.

Choices

Here are the choices in alphabetical order:

• Google’s Flutter
• JavaFX
• Facebook’s React Native
• Microsoft’s Xamarin

State of the Art

Declarative UIs are state-of-the-art. Learn about it here.

Popularity

Why Popularity - and How?

Picking a popular technology makes our developer life easier: Easier to learn, easier to build, debug & deploy, easier to find jobs/hire, and easier to convince teammates & bosses. Now popularity can make a difference in two situations: When multiple technologies score similarly, we could go for the most popular one. And when a technology is very unpopular, we may not use it.

I measure popularity among employers and developers as the trend between competing technologies. I count mentions in job ads at Indeed for employer popularity. For developer popularity, I use Google searches, Udemy course buyers, and Stack Overflow questions.

Installed Base

The mobile analytics company appfigures analyzes all apps in the Apple App Store and the Google Play Store. That’s why they can publish a list of how many apps use a particular technology. JavaFX isn’t on the list because it has a <1% market share. So here are the results for the other three frameworks:

React Native wins, Flutters is second, and Xamarin is third. React Native and Flutter have the same share on Android. But on iOS, React Native is 50% ahead of Flutter. Xamarin is way behind with 4% on both iOS and Android. All values have been stable for the last seven months.

Employers: Job Ads

The Indeed job search is active in 62 countries. I picked 59 countries representing 69% of the worldwide GDP in 2022, excluding three countries because English word searches proved ineffective there: China, Japan, and South Korea. Job searches demonstrate the willingness of organizations to pay for a technology - the strongest indicator of popularity in my mind. Flutter is the baseline.

React Native wins, Flutters is second, Xamarin is third, and JavaFX last. The number of developer ads is down in Q1/2023. React Native has dropped from a 2.9:1 lead over Flutter to 1.7:1 in the previous year. Xamarin lost a third of mentions against Flutter in the last 1.5 years. JavaFX held steady against Flutter at 6-7%.

Please see here for details, caveats, and adjustments to the job ad mentions.

You can find the detailed search results with links here. They include breakdowns by continents:

Developers

Students at Udemy

Udemy is one of the biggest online learning sites. They publish the number of people who bought a course (beyond a certain threshold, possibly around 100k). This shows how many people evaluate a technology. This time, React Native is the baseline.

Flutter wins, React Native is second, Xamarin is third, and JavaFX is fourth. Flutter steadily increased its lead over React Native and now leads React Native 2:1. Xamarin actually lost students and dropped from 30% of React Native’s values to just 19% — probably some courses were removed. JavaFX has been stable against React Native since September 2021, only losing 1% in the last two months.

Here are the links that show the courses for all and the number of students for some:

• Flutter
• JavaFX
• React Native
• Xamarin

Google Searches

Google Trends demonstrates the initial interest in a technology over time. “More searches = better” to me (chart link).

Google changed its measurement algorithms on January 1, 2016, and January 1, 2022. That caused spikes for all values, especially in 2022.

Flutter wins, React Native is second, Xamarin is third, and JavaFX is fourth. Flutter hit its all-time high in February, React Native a year ago. Since 2022, Flutter has led React Native at 1.9:1. JavaFX and Xamarin have declined for six years.

Questions at Stack Overflow

We can run database queries against the questions, answers, and comments at Stack Overflow with the StackExchange Data Explorer. The number of questions is a proxy for using a technology during evaluation and productive use. “More questions = better” to me.

I used two queries to get the number of monthly questions below because putting all in one query timed out. You can run them in the StackExchange Data Explorer.

DECLARE @StartDate DATE = '2009-01-01';
DECLARE @EndDate DATE = '2023-03-31';

WITH TaggedQuestions AS (
  SELECT
    Id,
    CreationDate,
    CASE WHEN CHARINDEX('<flutter>', Tags) > 0 THEN 1 ELSE 0 END AS FlutterTag,
    CASE WHEN CHARINDEX('<react-native>', Tags) > 0 THEN 1 ELSE 0 END AS ReactNativeTag,
    CASE WHEN CHARINDEX('<javafx>', Tags) > 0 THEN 1 ELSE 0 END AS JavaFXTag
  FROM Posts
  WHERE
    PostTypeId = 1 AND -- 1 for questions
    CreationDate >= @StartDate AND
    CreationDate <= @EndDate
),
MonthlyCounts AS (
  SELECT
    DATEADD(month, DATEDIFF(month, 0, CreationDate), 0) AS Month,
    SUM(FlutterTag) AS Flutter,
    SUM(ReactNativeTag) AS ReactNative,
    SUM(JavaFXTag) AS JavaFX
  FROM TaggedQuestions
  GROUP BY DATEADD(month, DATEDIFF(month, 0, CreationDate), 0)
)
SELECT
  Month,
  Flutter,
  ReactNative,
  JavaFX
FROM MonthlyCounts
ORDER BY Month;

DECLARE @StartDate DATE = '2009-01-01';
DECLARE @EndDate DATE = '2023-03-31';

WITH TaggedQuestions AS (
  SELECT
    Id,
    CreationDate,
    CASE WHEN CHARINDEX('<xamarin>', Tags) > 0 THEN 1 ELSE 0 END AS XamarinTag,
    CASE WHEN CHARINDEX('<maui>', Tags) > 0 THEN 1 ELSE 0 END AS NetMAUITag
  FROM Posts
  WHERE
    PostTypeId = 1 AND -- 1 for questions
    CreationDate >= @StartDate AND
    CreationDate <= @EndDate
),
MonthlyCounts AS (
  SELECT
    DATEADD(month, DATEDIFF(month, 0, CreationDate), 0) AS Month,
    SUM(XamarinTag) AS Xamarin,
    SUM(NetMAUITag) AS NetMAUI
  FROM TaggedQuestions
  GROUP BY DATEADD(month, DATEDIFF(month, 0, CreationDate), 0)
)
SELECT
  Month,
  Xamarin,
  NetMAUI
FROM MonthlyCounts
ORDER BY Month;

Flutter wins, React Native is second, Xamarin is third, and JavaFX is fourth. Flutter leads React Native 2:1. It lost a quarter of its all-time high from last August, while React Native dropped by a third since April 2020. JavaFX and Xamarin have declined for 4-5 years. .NET MAUI, the “Xamarin rewrite”, already leads its predecessor 2.5:1 but still has just a quarter of React Native’s questions.

Analysis

I use the following criteria to recommend one of the two choices - Flutter and React Native:

• Java: Flutter wins here because its language Dart is very similar to Java. React Native uses JavaScript instead.
• Declarative: Declarative is state-of-the-art for front-end development. It’s a draw because both frameworks work this way.
• Safe: Google has the image of killing projects and has multiple competing front-end frameworks. Although I personally think that Flutter will be around, it may be challenging to convince your teammates and your boss! That’s why React Native is my winner here.
• Popular: Flutter leads in three of the four popularity indicators but crucially loses in jobs — globally, there are 1.7 times as many for React Native. That’s why I declare React Native to be more popular.
• Mobile functionality: It’s a draw as both frameworks can build the applications we need.
• Libraries: I don’t know which of these two frameworks has the most and best libraries.
• Speed: Flutter is faster because it has a native render engine. In React Native, rendering has to pass a JavaScript bridge.
• Native Functionality: Flutter is the winner here: It has a lot of plug-ins that provide easy access to native functionality (like the camera or pictures), can show native screens, has channels for publish-and-subscribe communication with native code, and has a C API to top it all off.
• 1 Codebase: It’s a draw because both have one.
• Build, Deploy & Debug: I don’t know which frameworks have the shortest build & deploy cycle and the best debug experience.

Based on these criteria and my ratings, Flutter is the winner, and React Native is second. That’s why my recommendation is:

• If you start a new project and have used React for building web applications, then use React Native.
• If you start a new project and have .NET experience, use .NET MAUI.
• If you start a new project and need to use a library only available in Java, use JavaFX.
• Otherwise, start with Flutter first and use React Native if that doesn’t work out for you.