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Wed, Sep 10, 2025 • Featured

Introducing Agent 3: Our Most Autonomous Agent Yet

We’re excited to introduce Agent 3—our most advanced and autonomous Agent yet. Compared to Agent V2, it is a major leap forward. It is 10x more autonomous, with the ability to periodically test your app in the browser and automatically fix issues using our proprietary testing system—3x faster and 10x more cost-effective than Computer Use models. Even better, Agent 3 can now generate other agents and automations to streamline your workflows. What’s New 1. App Testing: Agent tests the apps it builds (using an actual browser) Agent 3 now tests and fixes the app it is building, constantly improving your app behind the scenes. We are launching two different options here, depending on your needs:

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  • Sun, Sep 13, 2020

    A database for every repl

    Repl.it is already the best place to build your apps. But there was a missing piece: where do you store your data? We’re introducing Repl.it Database: a fast, free, and easy key-value store that’s built into every repl.[](preview end) All you have to do is import one of our packages for Python, Node.js, or Go, and you can instantly start setting keys in your database. Because Database is built-in, there is no setup, provisioning, or configuration. It's the fastest and easiest way to store data on Repl.it.

  • Wed, Aug 26, 2020

    CLUI Command bar and Search

    One of the challenges of adding new functionality to any interface is balancing discoverability with visual clutter. We've written before about how a universal command bar can be a great way to expose features without overloading the UI with buttons. This pattern already works well for us in our mobile interface, so now we're bringing it to desktop! Here's a demo of what it looks like: The new command bar replaces our old shortcuts and file switcher modal. Just like before, you can use keyboard shortcuts (Cmd/Ctrl + P to switch files, Cmd/Ctrl + K to bring up all the options, etc) to interact with it. As we add more commands, power users will be able to have a keyboard centric experience while beginners can learn about features by exploring the different options. Among the new features introduced in the updated command bar is Search! Search indexes the contents of every file in your project (with the exception of hidden files such as node_modules and anything in your .gitignore) and allows you to see every instance of a query across every file in your repl. From there, you can scroll through the results, see which line and file they appear in, and select a result to navigate directly to that line in the code like so:

  • Fri, Aug 7, 2020

    The role of AI in coding

    Update: To stay up to date on Replit and AI, check out our Ghostwriter Beta & AI mode announcement. In it we discuss how we infused state-of-the-art intelligence into nearly all IDE features as well as the future of AI on Replit. In the past decade, we've seen an explosion of innovation in AI and machine learning. However, coding itself was barely touched by AI. The most significant example of AI-powered coding tools is editor autocomplete extensions like Kite or Tabnine. At Repl.it, we believe this is about to change. With the advent of natural language models like GPT, for the first time, we're seeing an ML model that performs shockingly well on all sorts of language-related tasks including coding. I was first introduced to and excited by the applications of natural language models in coding when I read the 2012 paper "On the Naturalness of Software," which leveraged an incredibly simple NLP technique called n-gram to build an autocomplete engine that rivaled industry standards. GPT-3, the newest model from OpenAI, is a multiple order of magnitude in power, making it feel closer to magic. We got access to the new model, which still in beta, and we quickly got to work building coding tools: Reading code is hard! Don't you wish you could just ask the code what it does? To describe its functions, its types. And maybe... how can it be improved? Introducing: @Replit code oracle 🧙‍♀️ It's crazy, just got access to @OpenAI API and I already have a working product! pic.twitter.com/HX4MyH9yjm — Amjad Masad (@amasad) July 22, 2020

  • Tue, Jul 28, 2020

    Shareable Computing

    This is a guest blogpost by GPT-3, the new AI software from OpenAI. We only gave it the title and "Repl.it" and it generated the following post for us For a while, I wondered why it's so hard to share code. Surely sharing webpages is easy, since you can link to them with a URL. But webpages are static. They're basically just text files. Their content never changes, so there's no reason to try to sync it. What changed my mind was the birth of "repl" programming. With repl, you type your program into a text box, press a button, and it runs immediately. A second text box shows its output. Repl turns programming into an activity like writing prose, in which you revise continuously, as many times as you like, and always with access to the latest version. I used to write my first drafts on paper, and then rewrite them in Word, or Google Docs. But repl turns code into the equivalent of a first draft. At first, repl was strictly for "quick-and-dirty" programming. But now that it's become popular, more and more people use it for serious coding. And repl is inherently more social than code sharing has ever been. Even if you're the only person in the world working on a particular program, you can invite your friends to code with you by sharing your repl, and anyone can see the source code.

  • Sun, Jul 26, 2020

    Emmet support

    Emmet is a plugin for many popular text editors which greatly improves HTML & CSS workflow, it's also one that's been requested by many of our users. It works for both HTML and CSS and you can use emmet in any repl as long as you're editing an HTML or CSS file. Please check the Emmet docs to learn more about it, and give it a spin by starting a new HTML repl and let us know what you think.

  • Wed, Jul 22, 2020

    Dear users coming from Glitch

    First, at Replit we're not motivated by competition. What we care about the most is making programming and computing more accessible. That means anyone who wants to code and build things should be able to do so without any hurdles. Recently, Glitch, one of our competitors focusing on JavaScript, has blocked pinging services from reaching user apps. Among other things it means they broke the Discord bot experience for their users. We don't have any insight on why they did that but it seems part of a larger change they're going through which also resulted in layoffs. That resulted in a user influx to Replit so I wanted to write this to welcome you to Replit and tell you a little about us. Replit has existed since 2011 and we've been growing the service in a sustainable way that doesn't result in disruptive changes. Building a service like ours is hard, especially for a small team like ours, and we're constantly improving and making things better. But our absolute top priority is being a place coders can depend on -- we will try our absolute best to never let you down.

  • Wed, Jul 1, 2020

    Multitabs

    Repl.it is a great place for prototyping ideas and starting new projects. However as your projects get bigger, the editing experience starts feeling a little limited. That's why we're exciting to announce that we're adding support for tabs! With the new multitab layout, you can open files in new tabs so that you can quickly switch back to them later. There are a few ways of opening a file in a new tab: Ctrl + Click (or Cmd + Click on MacOS) the file in the filetree Drag the file from the filetree directly onto the header or onto an open tab in the header Right click on the file and hit "Open tab" in the menu

  • Thu, May 21, 2020

    Share where you are in a Repl with Deeplinking

    Oftentimes when we're sharing a repl with a friend we want to link them to exactly where we are in our project. Well now you can with deeplinking! Deeplinking allows you to link to any file in your repl as well as specific lines and columns within that file. You may have noticed that the URL hash now changes as you navigate throughout the different files in your project. For example, if you're in src/index.js, it should look something like this: This means that all you have to do to link to the file that you're currently in is copy the URL! This also affects your browser history so if you hit the back button it'll take you to the last file you viewed rather than away from your repl entirely. If you want more granularity in your links, you can add :line or :line:col to the end of the URL. So linking to the 5th line and 12th column in src/index.js looks like this:

  • Thu, Apr 30, 2020

    Terminal Links

    Terminals make it hard to copy things: Selecting text works differently to what people are used to, and ^C aborts the current program. Links are hard to use. Now you can click on links in the repl.it terminal. It's as simple as starting a repl and printing a URL to the terminal. This is super helpful with languages like Rust, which often print URLs in error messages to help you debug and learn.

  • Tue, Apr 28, 2020

    Improving Repl.it's Mobile UX

    I like the process of writing because of how simple and portable the tools are. Regardless of time or place, a way to write things down is never far away. There's very little friction between inspiration and experimentation. I wish writing code was more like this. In fact, Repl.it is great for quickly experimenting with coding ideas. I can open a tab in my browser and start coding as fast as I can start writing an email. But what if I’m not near my computer? While Repl.it has always worked on phones, it was never optimized for it. That's why we're excited to release our first iteration of a mobile interface! Here's a quick look at running a Go http server using one of our templates: Rather than trying to adapt our desktop layout to a smaller screen we’re building this with native mobile design patterns in mind. We added a tab bar to the bottom of the screen. It acts as the primary navigation for the IDE similar to how native mobile apps do.

  • Fri, Apr 17, 2020

    Bringing Repl.it's Marketing to the Modern Age

    If you've been on the Repl.it landing page recently, you may have noticed a bit of a change! We spent a few weeks revamping our marketing pages and wanted to share a few words about how it went. A lot of design and engineering iteration went into not only making our new pages look great, but also creating a scalable and maintainable system. Our process Motivation & setup Naturally there were a lot of questions about where to start this redesign: the tone and voice of our copy? The visual style? The product we were advertising? Where the product was going to be in a few months? Ultimately this project was primarily motivated by growth and product education. For example, our previous landing page led with "Get your ideas out there", which is a great message and definitely part of our vision, but says nothing specific about the product. We wanted to approach the redesign not only as an opportunity to refine our visual and brand identity, but to get Repl.it out to millions more people and make the product dead-simple to understand.

  • Tue, Apr 14, 2020

    Terminal Search

    When you're deep into a debugging session printing a bunch of here, there, and wat, the output in the terminal can get hard to read. That's when search comes in handy, and that's why we're excited to announce our new terminal search functionality. You can get to it via the small search icon on the top-right corner of the terminal: And here it is in real-life action from one of a recent debugging session:

  • Tue, Mar 24, 2020

    Packaging Support for Java - Try Maven Packages in Your Browser

    Java is one of the most popular languages on Repl.it, and the JVM powers many of our other languages (Java Swing, Clojure, Kotlin). We want to make it as easy as possible to code with other people and build new programs out of programs that already exist. So we've added packaging support for Java! The Universal Package Manager now understands how to add and remove Java packages using Maven. It also can search the Maven central repository for packages. If you'd like to get familiar with the Java ecosystem, I highly recommend Andreas Kull's Awesome Java list. It was while scrolling through this list that I found Yasser Ganjisaffar 's crawler4j, a web-crawling library. Building something with Java + Packages To show you how powerful Java Maven packages could be, we're going to build an app to pull down the most interesting Twitter threads. To start, I made a new Java repl, searched for crawler4j, selected the edu.uci.ics:crawler4j package, added it, copy-pasted the quickstart example in crawler4j's README, and clicked "run." It started crawling the UCI computer science home page. That's not quite what I wanted, so I pointed the crawler at the Threader front page, to see if I could pull down some interesting Twitter threads. Thanks to Yasser's well-documented examples I soon had a directory of popular threads.

  • Thu, Mar 19, 2020

    How to Conduct Remote Interviews

    Remote interviews can be hard, especially if you’ve never done them before. With the COVID-19 crisis, we’re seeing a lot of teams forced to transition to remote interviewing. Luckily, we’ve done hundreds of remote phone screens, and more recently we’ve been doing what we’re calling “remote onsites.” In this post, we'll describe how we and some of our customers leverage Repl.it Multiplayer -- our realtime collaborative development environment -- and other tools to interview candidates remotely. The Phone Screen So much rides on programming interviews. When you're first starting as an interviewee, programming interviews can feel like a performance: you either meet or exceed the bar or you don't. That's much pressure! Teams who interview well do everything they can to put folks at ease so both sides can answer the question: are we excited to work together? At Repl.it, we want to make programming more accessible, which means making it more social, even casual. We introduced Multiplayer mode so that people can collaboratively work together on the same repl with realtime editing and running, which has been a substantial step-up from screen-sharing. Candidates can start coding in their preferred language in just a few seconds, and we can start writing tests right away in the same file. It often feels more like a collaboration session than an interview, which is an excellent sign.

  • Fri, Mar 13, 2020

    Teach Coding Remotely - free for public schools and 80% discount for everyone else

    *Edit: As of March 2022, Teams for Education is free for all educators. You can gain access here. We've been hearing from our teacher community that despite school closings they want to continue teaching their students remotely. Luckily Repl.it was designed to be remote-first and will be a perfect tool for this. We have two products that serve different remote modes: Multiplayer Real-time collaboration. You can invite your entire class into a repl to follow along or even collaborate all together. To that end, we're increasing the number of free collaborators on the free plan to 50 users!