Building in the browser
Replit Agent is the AI builder inside the cloud development service Replit. Describe what you want and it plans the work, writes the code, and checks that it runs while assembling an application or a site.
Code, a runtime, previews, a database, and publishing all sit in the browser, so nothing has to be installed. Beyond starting fresh, it can load an existing project from GitHub and continue working on it.
What you can delegate
- Prototyping web and mobile applications
- Planning the screens, data, and processing required
- Writing, explaining, and debugging code
- Verifying behavior through a preview
- Deploying the result to the cloud
Plan mode lets you review the implementation steps before files are changed. When a change goes wrong, checkpoints restore an earlier state, which makes iterating through conversation comfortable.
Compared with Lovable and Codex
Lovable is strong at assembling a web app — screens, authentication, database — and finishing it while previewing. Replit Agent covers more ground: several languages and frameworks, various file types, and a cloud runtime.
Codex suits development on your own machine and in existing repositories; Replit Agent keeps everything from environment setup to deployment inside the browser. Choose by whether you are modifying existing code, prototyping from nothing, or want the hosting handled too.
Cautions
An app the agent produced still needs review before release. Sign-in, data visibility, external APIs, and payments can all lead to unintended access or disclosure. Read the changes and test the main flows yourself.
The AI’s work and the cloud runtime may each incur credits or charges. Being specific, reviewing the plan before large features, and returning to a checkpoint rather than stacking failed fixes all keep consumption down.