Try the best online AI for code writing, built by the Refact.ai team. Our tool easily generates, optimizes, and explains the code of different programming languages. With its help, you can generate code using the best generative AI models currently available in the market: GPT-4o mini, GPT-4o, Claude 3.5 Sonnet and others.
You don't need to be a skilled engineer - this free tool is straightforward and extremely simple to use. Just choose a programming language, then pick a type of AI code helper, explain your task and get the answer in seconds.
Choose coding language and preferred AI model
Briefly describe what you want AI to help you with
Tap the button to get the job done!
How It Works
Using our AI code helper is pretty easy. Whether you are a skilled engineer seeking a function that slipped your mind or the one who just started learning coding, by following these simple steps you will get covered.
Select the lang: choose between a wide range of programming languages to find the one you want the code snippet to be written.
Select the AI model: you can start with GPT-4o mini, fast and smart OpenAI model, or choose another option in the dropdown menu.
Describe the task: Briefly explain what you want AI to help you with.
Clarify the output: Add extra instructions on whether you want to generate, optimize, or explain the code.
Push the button! In a few seconds, you'll get your task resolved.
For instance, you can use this AI tool to create a code of a website and then download it, or use it as AI to write Swift code for your app, or as HTML code generator - solve any task of your choice.
Key features and advantages
At first glance it is simple, but covers a wide range of coding needs:
Supports more than 25 programming languages and their libraries: You can generate code in Python, PHP, Java, or even specify your custom option.
Uses the best AI code models: all top programming LLMs, from GPT-4 to Claude 3.5 Sonnet, are available for you. Some of them may require you to sign in for access;
More than code writing: Our AI helper can not only write the code for you but also clarify it and add notes, optimize your code, and even suggest the most efficient solution. It's up to you.
Syntax highlighting: In the output, source code displayed in different colors for better readability.
You can сopy code snippets with one click and transfer them to your preferred code editor.
If you want your AI Coding Assistant to fully understand your project context and access more functionality, download Refact.ai. We bet you'll be satisfied.
Supported coding languages
There are so many programming languages that it becomes too easy to mix them all up. Let's define those supported by our AI code gen.
Python is widely used in data analysis and web development, especially for back-end applications with frameworks like Django and Flask. Coders love it for its versatility. It is also an easy-to-read language, which makes Python a great option for beginners.
C++: one of the members of the C programming language family that is known for its object-oriented features. Widely used in gamedev and programming of different software.
Go (also known as Golang): it's a simple but efficient language by Google, known for its speed and excellent abilities in concurrent programming.
Java: Android app developers like this one! Java is a language supported by multiple platforms and is popular for building software at scale.
JavaScript: if you need to enhance the functionality of your website and build some interactive web pages: this is your choice.
React: not a language, but a special library for JavaScript that is very good at building user interfaces, especially for single-page applications with complex UI.
TypeScript: same as React, it is not clearly a language rather an extension of JavaScript. It helps to make the code easier and more stable by defining code variable types in advance.
PHP: backend engineers use PHP because it helps build and manage the server part of web applications.
Rust: liked by many for its focus on performance and safety. Good error handling, fewer bugs and crashes - in other words, in Rust we trust!
Examples: Free AI Coder in action
Now, let's explore a few practical examples of how our virtual engineering assistant works.
Function Generation with AI Python code generator
Write a function that generates the Fibonacci sequence up to a specified number of terms and returns it as a list. Additionally, include error handling for invalid input.
Language: PythonAl Model: Claude 3.5 SonnetTask: Generate code
Generated Code:
Java AI code generator with code explanation
Create a class that represents a simple bank account with methods to deposit and withdraw funds.
Language: JavaAl Model: GPT 4o miniTask: Generate and explain code
Generated Code:
FAQ
Frequently asked questions - collected and clearly explained.
Can I use an AI Code Generator for free?
Yes, our AI Code Helper is absolutely free to use. Moreover, if you want to write the code with the GPT-4 mini model, you don't even need to sign up for our platform.
How many languages does the code generator support?
Our AI code helper supports more than the 25 most popular programming languages, including Python, Go, React, PHP, Java, C++ with its variations, and more.
How can I access the other AI models besides GPT-4o mini?
The fact that the code or code snippet was written by AI doesn't necessarily mean it's illegal. In fact, what you write is much more important than how it was written. Wouldn't you agree that a useful AI-gen software is more beneficial than a human-written but malicious program, right?
Of course, some universities and corporations prohibit using AI to write code, so please stick to internal rules set in your organizations and use AI responsibly.
What AI models are the best for coding in 2025?
It's disputable though we can share the Refact.ai choice. Currently, in 2025, we would pick Claude 3.5 Sonnet, GPT-4o mini and GPT-4o - all available on Refact.ai. Stay with us to be sure you have access to all the newest coding AI models in one place.
Is ChatGPT good for coding?
We would say Yes. Some OpenAI models, such as GPT-4, are exceptionally good at coding tasks. However, ChatGPT remains to be a platform for everyone, from marketers to coders, thus it can be as convenient as some coding-focused platforms with different AIs available.
How to tell if the code is AI generated?
That's pretty difficult, and you can never be 100% sure. Don't fully rely on automatic AI code detectors and plagiarism checkers, because almost all of them are AI-based as well, which means the AI is trying to find another AI.
If you want to check if code is AI-generated, try looking for consistency and simplicity in the code style, and look for generic comments that lack depth. If you see that a specific code snippet drastically differs from other parts of the code, that might be suspicious
This free mini app is fine, but I'm interested in more advanced coding AI solutions. Can you help?
Of course! If you want to delve into coding with AI to speed up your programming tasks, try out Refact.ai advanced coding assistant - and all the top code LLMs will be right at your fingertips.
Useful links and resources
Our team has prepared for you a list of resources that you may find useful.