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What Is Replit Agent? How to Use This AI Development Tool and What It Can Do [Latest 2026]
機械翻訳 / Machine-translated
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AI Friends
2026年5月11日・12分で読める
機械翻訳 / Machine-translated
@aifriends
AI Friends（https://aifriends.jp）のクロスポスト公式アカウント。AIツールの紹介・使い方・できることを、中学生でもわかるやさしい日本語で届けます。
Wouldn't it be convenient if you could build apps even without any programming knowledge?
Replit Agent is a development tool that uses AI to write code for you automatically.
Just give instructions in plain language, and a full-featured web app is ready in minutes.
This article explains everything from the basics of Replit Agent to how to use it, in a way that's easy to understand even for beginners.
Replit Agent is an AI feature built into Replit, a cloud-based development environment.
With traditional programming, you had to write code line by line.
With Replit Agent, all you need to do is give instructions in natural language, such as Japanese or English.
The AI automatically generates the necessary code and completes the app for you.
Since it runs entirely in the browser, there's no need to install any special software.
It's a groundbreaking tool that lets even non-engineers turn their ideas into reality.
Replit Agent supports the development of a wide variety of applications.
Here are five of its main capabilities.
Just type something like "Create a to-do list app" in plain language, and the AI will write all the necessary code for you.
It can also automatically handle development that combines multiple languages, such as HTML, CSS, and JavaScript.
You can add or modify app features by chatting with the AI.
Instructions like "Change the button color to blue" or "Add a login feature" let you make fine-grained adjustments through conversation.
The AI will automatically configure the database needed to store your data.
This is normally a task that requires specialized knowledge, but with Replit Agent, all it takes is a simple instruction.
Replit Agent automatically tests the app it creates.
It also features a reflection loop function that finds issues and fixes them on its own to improve the app.
Once your app is complete, you can publish it to the internet with the click of a button.
No complex server configuration is needed — your app can be used by anyone around the world right away.
Here is a step-by-step guide to the basic usage of Replit Agent.
Visit the official Replit website (replit.com).
Click the "Sign Up" button and register with your email address or Google account.
The basic features are available on the free plan, so start by trying it out for free.
After logging in, look for the "Create Repl" or "Start with Agent" button.
Click it to launch Replit Agent and open the chat screen.
Type a description of the app you want to build into the chat field.
Example: "Please create a simple to-do list app. I'd like to be able to add and delete tasks."
The more specific you are, the more accurate the generated app will be.
Once you send your instruction, the AI will automatically start writing the code.
A working app will be ready in anywhere from a few seconds to a few minutes.
The code is displayed on screen in real time, so you can track the progress as it happens.
Check the generated app, and if anything needs changing, simply request modifications through the chat.
You can make as many adjustments as you like — "Make the button design more stylish," "Change the background color," and so on.
When you're satisfied, click the "Deploy" or "Publish" button.
A URL will be generated immediately, turning your project into a web app that anyone can access.
Replit Agent has many benefits, but there are also a few things to keep in mind.
Replit Agent is especially recommended for the following types of people.
On the other hand, if you want to learn serious engineering skills or develop large-scale systems, it's best to use Replit Agent in combination with traditional learning methods.
Replit Agent is a tool that uses the power of AI to significantly lower the barrier to programming.
Let's recap the key points from this article.
Even if you've always thought "programming looks too hard," Replit Agent makes it easy to get started.
Why not take the plunge with the free plan and try building a simple app?
Your ideas just might become reality with the help of AI.
This article is a cross-post from AI Friends.
