Page 2 | Best AI Coding Assistants for Java

Ona

Ona, formerly Gitpod, is a modern development platform that provides mission control for software projects and engineering agents. It allows developers to keep momentum on any device by offering sandboxed, API-first environments in the cloud or within a company’s VPC. These environments come pre-configured with tools, dependencies, and controls, ensuring a consistent and secure setup for professional software engineering. Ona Agents further enhance productivity by assisting with tasks like scoping, writing, reviewing, and documenting code across the entire development lifecycle. Enterprise-ready guardrails deliver fine-grained permissions, policies, and audit trails, giving organizations full control over compliance and security. Trusted by millions of developers and Fortune 500 companies, Ona integrates seamlessly with tools like GitHub, GitLab, AWS, Copilot, and Amazon Bedrock.

Starting Price: $20/month

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CodeSandbox

CodeSandbox is a cloud development platform that empowers development teams to code, collaborate, and ship projects of any size from any device in record time. Run your code in powerful microVMs and build anything without limits. We configure your environment for you and keep your code always ready, behind a URL. Boxy, the CodeSandbox AI coding assistant, is also now available to all Pro subscribers.

Starting Price: $12 per month

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Safurai

Safurai is an AI-based IDE extension designed to assist developers by speeding up coding, debugging, refactoring, documentation and many more tasks. It acts as a virtual assistant, providing solutions and suggestions for any issues that may arise during the software development process. With Safurai, developers can improve their workflow and code quality, making the development process more efficient and streamlined. Safurai AI is made up of a set of non-proprietary Large Language Models optimized for programming and performing all the functions. The models we use are trained with synthetic data only, we do not retain or reuse user codebase data for model improvement purposes. For Safurai, "Transparency" is not only a vogue word. We care a lot about transparency.

Starting Price: $0

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$Refraction$

Refraction

Refraction is a code-generation tool for developers. It uses AI to generate code for you. You can use it to generate unit tests, documentation, refactor code, and more. Generate code using AI in 34 languages — Assembly, C#, C++, CoffeeScript, CSS, Dart, Elixir, Erlang, Go, GraphQL, Groovy, Haskell, HTML, Java, JavaScript, Kotlin, LaTeX, Less, Lua, MatLab, Objective-C, OCaml, Perl, PHP, Python, R Lang, Ruby, Rust, Sass / SCSS, Scala, Shell, SQL, Swift, and TypeScript. Join thousands of developers around the world using Refraction to generate documentation, create unit tests, refactor code, and more using AI. Use the power of AI to automate the tedious parts of software development like testing, documentation, and refactoring, so you can focus on what matters. Refactor, optimize, fix and style-check your code. Generate unit tests for your code with various test frameworks. Explain the purpose of your code to make it easier to understand.

Starting Price: $8 per month

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Hacker AI

Hacker AI is an artificial intelligence system that scans source code to identify potential security weaknesses that may be exploited by hackers or malicious actors. By identifying these vulnerabilities, organizations can take steps to fix the issues and prevent security breaches. Hacker AI is created by a French company based in Toulouse that uses a GPT-3 model. Please compress your project source code into a single Zip archive and upload it. Check your email, as you will receive the vulnerability detection report within 10 minutes. The Hacker AI is in the beta phase and the results it provides are not useful without the guidance of a cybersecurity expert with a background in code analysis. We do not sell or use your code source for malicious purposes. It is strictly used for the detection of vulnerabilities. If necessary, you can request a dedicated non-disclosure agreement (NDA) from us. You can also request a private instance.

Starting Price: Free

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SpellBox

With SpellBox, you can say goodbye to hours of frustrating coding and hello to quick, easy solutions. SpellBox creates the code you need from simple prompts, so you can solve your toughest programming problems in seconds. No more time wasted on syntax errors, debugging, or scouring the internet for answers. With SpellBox, you'll have the code you need right at your fingertips, allowing you to focus on what really matters, delivering top-quality results. With the code explanation feature, you can save time by quickly gaining a deep understanding of the code you are working with, without having to spend hours researching or studying documentation. It's the perfect tool for anyone looking to improve their coding proficiency and maximize their productivity. With code bookmarking, you can save your code snippets, and quickly find what you retrieve them later. This feature is especially useful for developers who work on multiple projects and need to access their code snippets frequently.

Starting Price: $40 per month

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Refact.ai

Refact AI

Refact.ai is a cutting-edge, open-source AI coding assistant designed to enhance developer productivity through intelligent code completion, real-time code reviews, and personalized support. By integrating with popular IDEs like VS Code, JetBrains, and PyCharm, Refact.ai provides a seamless development experience, offering personalized auto-completion, code refactoring, and AI-driven suggestions based on your unique codebase. With the ability to fine-tune models using company-specific data, Refact.ai optimizes its performance for better accuracy and faster code generation. Whether you're building new features or improving existing code, Refact.ai ensures your development process is more efficient, secure, and aligned with best practices.

Starting Price: $0

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Cody

Sourcegraph

Cody, Sourcegraph’s AI code assistant goes beyond individual dev productivity, helping enterprises achieve consistency and quality at scale with AI. Unlike traditional coding assistants, Cody understands the entire codebase, enabling deeper contextual awareness for smarter autocompletions, refactoring, and AI-driven code suggestions. It integrates with IDEs like VS Code, Visual Studio, Eclipse, and JetBrains, providing inline editing and chat without disrupting workflows. Cody also connects with tools like Notion, Linear, and Prometheus to enhance development context. Powered by advanced LLMs like Claude Sonnet 4 and GPT-4o, it optimizes speed and performance based on enterprise needs, and is always adding the latest AI models. Developers report significant efficiency gains, with some saving up to six hours per week and doubling their coding speed.

Starting Price: $59

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Lightly

Develop your apps efficiently with Multilingual cloud IDE - Lightly. Create high-quality code in no time with AI-generated code and collaborative development features. Lightly is a powerful cloud IDE that supports multiple programming languages, including Java, Python, C++, HTML, JavaScript. Write, run, and debug code on iPad, anywhere, anytime. The AI-generated code feature helps you quickly generate code. Collaborative development enables easy team collaboration in real-time. Lightly can deploy and host your projects without managing infrastructures. We'll provide project images to efficiently help you deploy on AWS, Azure, GCP, or any other cloud provider. You focus on your creativity and ideas, and let the AI programming assistant do the rest for you!

Starting Price: $9 per month

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BotCity

With the proliferation of user-created Python scripts and AIs outside of IT governance, companies face increasing risks of Shadow IT, such as security breaches, compliance issues, and loss of operational control. BotCity solves this scenario with a centralized governance platform, enterprise orchestration, and real-time visibility into all Python automations, including AI-driven ones. In addition, it enables you to accelerate hyperautomation initiatives with RPA and AI, reduce costs (up to 5x lower than low-code platforms), and run bots flexibly on VMs, containers, and serverless environments, with support for systems such as SAP, Citrix, Windows, and Linux. Free 30-day trial available.

Starting Price: 30-day trial

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DevGPT

Elevate your development game. with DevGPT We handle the routine coding, you focus on more complex and fulfilling tasks, by turning tasks to code. Click below and start transforming your coding experience in just 40 seconds. Generate custom code trained on your own repository and sync effortlessly. A new level of personalized automation in coding. Our AI model generates code in an average of 40 seconds, allowing for rapid prototyping and quicker go-to-market times. Achieve more with fewer resources. With automatically generated unit tests and AI-powered debugging, DevGPT ensures your code meets the highest quality standards. Reduce errors and elevate your end product. Code smarter, not harder. DevGPT understands your code base to deliver precise, ready-to-deploy solutions. Say goodbye to the stress of disorganization and hello to a more focused, efficient, and successful you

Starting Price: $15.99 per month

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Cosine Genie

Cosine

Whether it’s high-level or nuanced, Cosine can understand and provide superhuman level answers. We're not just an LLM wrapper – we combine multiple heuristics including static analysis, semantic search and others. Simply ask Cosine how to add a new feature or modify existing code and we’ll generate a step by step guide. Cosine indexes and understands your codebase on multiple levels. From a graph relationship between files and functions to a deep semantic understanding of the code, Cosine can answer any question you have about your codebase. Genie is the best AI software engineer in the world by far - achieving a 30% eval score on the industry standard benchmark SWE-Bench. Genie is able to solve bugs, build features, refactor code, and everything in between either fully autonomously or paired with the user, like working with a colleague, not just a copilot.

Starting Price: $20/month

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McAnswers AI

McAnswers is an AI tool specifically designed for coders to simplify their coding journey. Quickly find and fix code errors and get precise suggestions for code improvement. McAnswers AI supports multiple programming languages. Our AI chatbot for programmers is designed to be a virtual assistant that can help you with a wide range of programming-related tasks.

Starting Price: $8.33 per month

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Fine

Fine.dev

Fine is an AI-powered development platform designed to assist startups by automating tasks throughout the software development lifecycle. It offers a range of AI agent workflows for coding, debugging, testing, and code review, allowing teams to ship daily improvements and resolve pull requests faster. Fine can autonomously create and implement code, conduct pull request reviews, generate tests, and handle common issues without constant human input. The platform integrates seamlessly with GitHub and supports asynchronous work, making it particularly suitable for fast-paced startups. With real-time feedback and live previews, Fine improves productivity and streamlines the development process.

Starting Price: $15 per month

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Codestral

Mistral AI

We introduce Codestral, our first-ever code model. Codestral is an open-weight generative AI model explicitly designed for code generation tasks. It helps developers write and interact with code through a shared instruction and completion API endpoint. As it masters code and English, it can be used to design advanced AI applications for software developers. Codestral is trained on a diverse dataset of 80+ programming languages, including the most popular ones, such as Python, Java, C, C++, JavaScript, and Bash. It also performs well on more specific ones like Swift and Fortran. This broad language base ensures Codestral can assist developers in various coding environments and projects.

Starting Price: Free

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MarsCode

MarsCode: A highly intelligent, ready-to-use AI development tool. With its 'out-of-the-box cloud AI IDE' and 'powerful AI assistant', MarsCode comprehensively facilitates efficient learning and smooth operations for developers. Key Features include: 1. An out-of-the-box cloud AI IDE, liberating development from device and location constraints. 2. Extensions for local IDEs, bring the experience of AI intelligence to traditional development. 3. Boasting features for code completion and generation, bug fixing, code optimization and more, provides intelligent assistance across the full development process to developers. 4. Repository-level intelligent Q&A feature, allowing developers to focus more. 5. Supports different kinds of applications deployment, including websites, AI plugins, and APIs, etc.

Starting Price: Free

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Monica Code

Monica

One-stop AI Coding Assistant for favorite code editor. Supports GPT-4o and Claude 3.5 Sonnet. Realtime code suggestion based on cursor location and comments while you coding. Select any code and update them with a simple prompt. Easily modify a function or rewrite the whole class. Chat with active file or whole indexed codebase using best models like Claude 3.5 Sonnet or GPT-4o, or send a screenshot to help debugging. Simply ask Monica Code to create or modify multiple files, and navigate through different composed versions. By describing your requirements in natural language, Monica Code can assist in generating appropriate code snippets or structure in your chosen language. This AI-assisted capability applies to various programming tasks, from simple scripts to more complex application structures.

Starting Price: $16.60 per month

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Restack

A framework built specifically for the challenges of autonomous intelligence. Continue to write software using your language practices, libraries, APIs, data and models. Your proprietary autonomous product that adapts and scales with your development. Autonomous AI can automate video creation by generating, editing, and optimizing content, significantly reducing manual tasks in the production process. By integrating with AI tools like Luma AI or OpenAI for video generation, and scaling text-to-speech on Azure, your autonomous system can produce high-quality video content By integrating with platforms like YouTube your autonomous AI can continuously improve based on feedback and engagement metrics. We believe the most promising path to AGI is in the orchestration of millions of autonomous systems. We are a small group of passionate engineers and researchers dedicated to building autonomous artificial intelligence. If this sounds interesting to you, we would love to hear from you.

Starting Price: $10 per month

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16x Prompt

Manage source code context and generate optimized prompts. Ship with ChatGPT and Claude. 16x Prompt helps developers manage source code context and prompts to complete complex coding tasks on existing codebases. Enter your own API key to use APIs from OpenAI, Anthropic, Azure OpenAI, OpenRouter, or 3rd party services that offer OpenAI API compatibility, such as Ollama and OxyAPI. Using API avoids leaking your code to OpenAI or Anthropic training data. Compare the code output of different LLM models (for example, GPT-4o & Claude 3.5 Sonnet) side-by-side to see which one is the best for your use case. Craft and save your best prompts as task instructions or custom instructions to use across different tech stacks like Next.js, Python, and SQL. Fine-tune your prompt with various optimization settings to get the best results. Organize your source code context using workspaces to manage multiple repositories and projects in one place and switch between them easily.

Starting Price: $24 one-time payment

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GitLab Duo

GitLab

Ship more secure software faster with AI throughout the entire software development lifecycle GitLab Duo is an AI-powered assistant integrated into the GitLab platform, designed to enhance software development productivity and collaboration. It provides intelligent code suggestions, helps refactor and debug code, and streamlines workflows by automating repetitive tasks. GitLab Duo also supports natural language queries for project management and development insights, enabling developers to interact with their repositories more intuitively. Integrated with popular IDEs like JetBrains and Neovim, GitLab Duo ensures seamless assistance within developers' preferred environments. By combining AI-driven efficiency with GitLab’s robust DevSecOps features, GitLab Duo empowers teams to deliver high-quality software faster and more collaboratively.

Starting Price: $19/user/month

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Cline

Cline AI Coding Agent

Autonomous coding agent right in your IDE, capable of creating/editing files, running commands, using the browser, and more with your permission every step of the way. Cline can handle complex software development tasks step-by-step. With tools that let him create & edit files, explore large projects, use the browser, and execute terminal commands (after you grant permission), he can assist you in ways that go beyond code completion or tech support. While autonomous AI scripts traditionally run in sandboxed environments, this extension provides a human-in-the-loop GUI to approve every file change and terminal command, providing a safe and accessible way to explore the potential of agentic AI.

Starting Price: Free

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Fynix

Fynix is an AI-powered platform designed to boost software development productivity through intelligent coding assistance and agent-based code reviews. It integrates directly into popular IDEs like VS Code and offers features such as context-aware autocomplete, natural language commands for code fixes and translations, and automatic code flow visualizations. Fynix’s Code Assistant helps developers write cleaner, more efficient code faster, while its upcoming Code Quality Agent will automate bug detection and enforce coding standards. With support for multiple programming languages and frameworks, and integrations with tools like Jira, Fynix is a versatile platform for improving coding efficiency and collaboration.

Starting Price: Free

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Codespell.ai

Codespell.ai is an AI-powered coding assistant that enhances code quality and productivity. Its key feature, Design Studio, automates project setup by generating structured designs and starter-kit codebases, streamlining development from concept to deployment.

Starting Price: $15/month/user

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Codex CLI

OpenAI

Codex CLI is an open-source, lightweight coding agent that integrates directly into your terminal, designed to help developers write, edit, and understand code efficiently. By pairing with Codex CLI, developers can leverage the power of AI to streamline their workflow, get real-time code suggestions, and improve their coding accuracy, all from within their command line interface. It provides a seamless, accessible way to enhance coding productivity while staying in the environment developers are already comfortable with.

Starting Price: Free

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ZZZ Code AI

ZZZ Code AI is an AI-powered coding assistant designed to support developers across various programming tasks. It offers a suite of tools, including AI Code Generator, AI Bug Detector, AI Code Explainer, AI Code Refactor, AI Code Review, AI Code Converter, and AI Code Documentation. It supports multiple programming languages such as Python, C#, C++, Java, JavaScript, HTML, CSS, SQL, and Excel formulas. Users can input their coding requirements or questions, and the AI provides instant responses, code snippets, explanations, or conversions as needed. Specialized tools are available for specific languages and frameworks, including Dapper and Entity Framework Core. It is accessible online without the need for account creation, although character limits apply to prevent abuse. ZZZ Code AI aims to enhance productivity and reduce errors for both novice and experienced developers by automating routine coding tasks and providing immediate assistance.

Starting Price: Free

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Kiro

Amazon Web Services

Kiro is an AI‑powered integrated development environment that brings structure to AI‑driven coding by converting natural‑language prompts into clear requirements, system designs, and discrete implementation tasks validated by robust tests. Built from the ground up for agentic workflows, it features spec‑driven development, multimodal chat, “agent hooks” that trigger background tasks on events like file saves, and an autopilot mode that autonomously runs large scripts while keeping you in control. With smart context management, Kiro reduces repetitive prompts and helps implement complex features across large codebases. Native MCP integrations let you connect to documentation, databases, and APIs, and you can guide development with images of UI designs or architecture diagrams. Enterprise‑grade security and privacy ensure safe deployment, while support for Claude Sonnet models, Open VSX plugins, and existing VS Code settings delivers a familiar yet AI‑supercharged experience.

Starting Price: $19 per month

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Qoder

Qoder is an agentic coding platform engineered for real software development, designed to go far beyond typical code completion by combining enhanced context engineering with intelligent AI agents that deeply understand your project. It allows developers to delegate complex, asynchronous tasks using its Quest Mode, where agents work autonomously and return finished results, and to extend capabilities through Model Context Protocol (MCP) integrations with external tools and services. Qoder’s Memory system preserves coding style, project-specific guidance, and reusable context to ensure consistent, project-aware outputs over time. Developers can also interact via chat for guidance or code suggestions, maintain a Repo Wiki for knowledge consolidation, and control behavior through Rules to keep AI-generated work safe and guided. This blend of context-aware automation, agent delegation, and customizable AI behavior empowers teams to think deeper, code smarter, and build better.

Starting Price: $20/month

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Brokk

Brokk is an AI-native code assistant built to handle large, complex codebases by giving language models compiler-grade understanding of code structure, semantics, and dependencies. It enables context management by selectively loading summaries, diffs, or full files into a workspace so that the AI sees just the relevant portions of a million-line codebase rather than everything. Brokk supports actions such as Quick Context, which suggests files to include based on embeddings and structural relevance; Deep Scan, which uses more powerful models to recommend which files to edit or summarize further; and Agentic Search, allowing multi-step exploration of symbols, call graphs, or usages across the project. The architecture is grounded in static analysis via Joern (offering type inference beyond simple ASTs) and uses JLama for fast embedding inference to guide context changes. Brokk is offered as a standalone Java application (not an IDE plugin) to let users supervise AI workflows clearly.

Starting Price: $20 per month

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Codacy

Codacy is an automated code review tool that helps identify issues through static code analysis, allowing engineering teams to save time in code reviews and tackle technical debt. Codacy integrates seamlessly into existing workflows on your Git provider, and also with Slack, JIRA, or using Webhooks. Users receive notifications on security issues, code coverage, code duplication, and code complexity in every commit and pull request along with advanced code metrics on the health of a project and team performance. The Codacy CLI enables running Codacy code analysis locally, so teams can see Codacy results without having to check their Git provider or the Codacy app. Codacy supports more than 30 coding languages and is available in free open-source, and enterprise versions (cloud and self-hosted). For more see https://www.codacy.com/

Starting Price: $15.00/month/user

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IntelliCode

Microsoft

Visual Studio IntelliCode: AI-assisted development. IntelliCode saves you time by putting what you’re most likely to use at the top of your completion list. IntelliCode recommendations are based on thousands of open source projects on GitHub each with over 100 stars. When combined with the context of your code, the completion list is tailored to promote common practices. IntelliCode isn’t limited to statement completion. Signature help also recommends the most likely overload for your context. IntelliCode can provide recommendations based on your code and seamlessly share them across your team. With this preview feature, you can build a team model to provide recommendations on code that isn’t in the open source domain, such as methods on your own utility classes or domain specific library calls. Integrate our build task into your pipeline to keep your team completions up to date with repository changes.

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Best AI Coding Assistants for Java - Page 2

Compare the Top AI Coding Assistants that integrate with Java as of December 2025 - Page 2