Agent 3

Agent 3

Replit
+
+

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About

Replit Agent 3 is the most autonomous, AI-powered builder yet for creating production-ready applications entirely through natural-language prompts. You describe the app or website idea, and Agent automatically handles everything: setting up the full-stack environment, designing interfaces, configuring databases, managing dependencies, and integrating authentication or third-party services like Stripe or OpenAI. It offers two development modes: a visual-first “Start with a design” option that generates a clickable prototype in just minutes before enabling full functionality, or a “Build the full app” mode that constructs a functioning application, including frontend, backend, and integrations, in around 10 minutes. Agent 3 also self-tests within a browser workflow, identifying bugs, fixing them, and rerunning tests in a continuous reflection loop that is up to 3x faster and 10x more cost-efficient than traditional testing models.

About

Codex is an AI-powered coding agent from OpenAI designed to help developers build, manage, and ship software more efficiently across the entire development lifecycle. It acts as an intelligent pair programmer that can understand codebases, generate features, and deliver production-ready pull requests. Codex can safely execute commands in sandboxed environments while assisting with debugging, refactoring, and testing. A key advancement is its computer use capability, allowing it to operate your computer by seeing, clicking, and typing across applications. This enables Codex to interact with tools that don’t have APIs, making it useful for tasks like frontend testing and app navigation. The platform also includes an in-app browser and integrations with various developer tools for a more unified workflow. Codex supports automation by handling ongoing tasks such as monitoring, issue triage, and follow-ups.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Supported
On-Premises Not Supported
iPhone Supported
iPad Supported
Android Supported
Chromebook Not Supported

Audience

Product managers in search of a solution to build, test, and deploy fully functioning apps using plain-language prompts, guided development modes, and high-autonomy AI assistance

Audience

Codex is ideal for software developers, engineering teams, and tech organizations that want to automate coding tasks, leverage AI-driven workflows, and utilize computer-based automation to accelerate software development

Support

Phone Support Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$20 per month
Free Version Supported
Free Trial Not Supported

Pricing

$20/month
Free Version Supported
Free Trial Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 5.0 / 5
support 5.0 / 5

Pros & Cons from Real Users

Pros

  • OpenAI Codex feels less like a coding assistant and more like a junior developer that can execute tasks independently. For knowledge workers juggling technical and non technical work, this shift is powerful because it can take a task, work through it, and return with usable results. Its ability to operate across full codebases is a major strength, allowing it to write, debug, test, and manage multiple files in a way that fits real world development workflows. The multi agent and automation capabilities are particularly useful since you can run parallel tasks and orchestrate work efficiently, which significantly improves productivity on complex projects. It is also expanding beyond pure coding with features that allow interaction with software environments, making it feel like a broader work assistant.

Cons

  • Codex can still struggle with very large or highly complex projects without iteration, and outputs often need refinement through multiple passes. The setup and workflow can feel heavier compared to simpler tools, especially when integrating with repositories or managing environments. There is also strong competition, and in some advanced or highly structured coding scenarios other tools may feel more precise.

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Replit
Founded: 2016
United States
replit.com/agent3

Company Information

OpenAI
Founded: 2015
United States
openai.com

Alternatives

Alternatives

Perplexity Computer

Perplexity Computer

Perplexity AI
Bolt.new

Bolt.new

StackBlitz
Codex CLI

Codex CLI

OpenAI
WebSparks

WebSparks

WebSparks.AI
Claude Code

Claude Code

Anthropic

Categories

Agentic AI Supported
AI Agents Supported
AI App Generators Supported
AI Coding Agents Supported
Vibe Coding Supported

Categories

Agentic AI Supported
AI Agents Supported
AI Code Generators Supported
AI Coding Agents Supported
AI Tools Supported
Vibe Coding Supported

Integrations

OpenAI Supported
Slack Supported
Adspirer Not Supported
ChatGPT Images 2.0 Not Supported
Cocuyo Not Supported
Devin Desktop Not Supported
Freckle Not Supported
GPT-5 pro Not Supported
GPT-5.1 Instant Not Supported
GPT-5.1 Pro Not Supported
GPT-5.2 Pro Not Supported
GPT-5.4 mini Not Supported
GPT-5.5 Not Supported
HQ Not Supported
Ornold Not Supported
Semgrep Not Supported
Snyk Not Supported
Wandesk Not Supported
kodwai Not Supported
nono Not Supported

Integrations

OpenAI Supported
Slack Supported
Adspirer Supported
ChatGPT Images 2.0 Supported
Cocuyo Supported
Devin Desktop Supported
Freckle Supported
GPT-5 pro Supported
GPT-5.1 Instant Supported
GPT-5.1 Pro Supported
GPT-5.2 Pro Supported
GPT-5.4 mini Supported
GPT-5.5 Supported
HQ Supported
Ornold Supported
Semgrep Supported
Snyk Supported
Wandesk Supported
kodwai Supported
nono Supported
Claim Agent 3 and update features and information
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Claim OpenAI Codex and update features and information
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