OpenAI Codex
OpenAI's coding agent that writes, reviews and runs code from terminal, IDE, desktop or cloud
Freemium
Replit
Describe an app in plain language and build, test and publish it in one browser workspace
Freemium
Verdict
OpenAI Codex and Replit are both Coding AI tools. OpenAI Codex scores higher in FinderAtlas's editorial review (8.5 vs 8.3 out of 10). Both have a free plan or trial. Only OpenAI Codex is available on Windows, macOS and Linux and offers an API. Only Replit is available on iOS and Android.
Best overall
OpenAI Codex
- Software developers
- Engineering teams
- Enterprise engineering organizations
- Open-source maintainers
Choose OpenAI Codex if
- You want a tool built for delegating coding tasks to an agent.
- Included with ChatGPT plans, with a free tier and an $8 Go tier.
- Open-source CLI under the Apache-2.0 license.
Choose Replit if
- You want a tool built for prototyping web apps from a prompt.
- Builds, tests and publishes an app from one chat, with no local setup.
- Free Starter plan with daily Agent credits and one published app.
- Best for beginners
- Replit
- Best for business
- OpenAI Codex
Features
19 features compared.
- Codex CLIOpenAI CodexAvailableReplitNot available
- IDE extensionOpenAI CodexAvailableReplitNot available
- Desktop appOpenAI CodexAvailableReplitNot available
- Cloud tasksOpenAI CodexAvailableReplitNot available
- Code reviewOpenAI CodexAvailableReplitNot available
- Non-interactive modeOpenAI CodexAvailableReplitNot available
- MCP, skills and pluginsOpenAI CodexAvailableReplitNot available
- Subagents and web searchOpenAI CodexAvailableReplitNot available
- Session resume and imagesOpenAI CodexAvailableReplitNot available
- Mobile remote controlOpenAI CodexAvailableReplitNot available
- Replit AgentOpenAI CodexNot availableReplitAvailable
- Multiple artifact typesOpenAI CodexNot availableReplitAvailable
- Design CanvasOpenAI CodexNot availableReplitAvailable
- Plan ModeOpenAI CodexNot availableReplitAvailable
- One-click publishingOpenAI CodexNot availableReplitAvailable
- Built-in databases and storageOpenAI CodexNot availableReplitAvailable
- Connectors and MCPOpenAI CodexNot availableReplitAvailable
- CollaborationOpenAI CodexNot availableReplitAvailable
- Mobile appOpenAI CodexNot availableReplitAvailable
Pricing
Plans as listed by each vendor. Check their sites for current prices.
- Pricing modelOpenAI CodexFreemiumReplitFreemium
- Free planOpenAI CodexYesReplitYes
- Starting priceOpenAI Codex$0Replit$0
- PlansOpenAI Codex7 plansReplit4 plans
OpenAI Codex plans
Free
$0
Quick coding tasks
- GPT-6 Luna in the desktop app
- Subject to rollout
Go
$8/month
Lightweight coding tasks
- GPT-6 Luna in the desktop app
Plus
Most popular$20/month
Focused coding sessions
- Web
- CLI
- IDE and iOS access
- Automatic code review and Slack
- GPT-6.1 Sol and GPT-6 Luna
- Can add credits
Pro
$100/month
Plans at $100, $200 or $500 per month
- Everything in Plus
- No five-hour limit currently
- Ultrafast mode on the $500 plan
Business
$25/user/mo
2 or more users; $20 per user per month when billed annually
- Desktop and mobile apps
- Larger cloud VMs
- Add-on credits
- SAML SSO and MFA
- No training on business data by default
Enterprise & Edu
Custom/user/mo
Contact sales
- Priority request processing
- SCIM
- EKM and RBAC
- User analytics
- Compliance API audit logs
- Retention and residency controls
API Key
Pay-as-you-go/usage
Billed at OpenAI API pricing
- Codex in the CLI
- SDK and IDE extension
- No cloud features
- Models depend on the API key
Replit plans
Starter
$0
Free plan with daily Agent credits and one published app
- Daily Agent credits up to a monthly cap
- Lite build
- 1 published app that goes down after 30 days
- Monthly cloud credits
- Design Canvas
Core
Most popular$20/month
For individual builders, with up to 5 builders per Workspace
- Full build
- Paid Agent modes
- Unlimited published apps
- Plan Mode
- Connectors
- Replit AI Integrations
- Made with Replit badge removal
- Monthly credits
Pro
$100/month
For teams that have outgrown Core, with up to 15 builders
- Everything in Core
- Up to 10 parallel tasks
- Tiered credits with two-month rollover
- Priority support
- 28-day database recovery window
Enterprise
Custom/custom
For organizations that need SSO, governance and dedicated support
- Everything in Pro
- SAML SSO and SCIM
- Audit logging
- Admin governance controls
- Unlimited seats
- Dedicated support
Our ratings
Scored out of 10 by the Finder Atlas editorial team. Last reviewed October 2026.
- OpenAI Codex
- 8.5overall
- Replit
- 8.3overall
OpenAI Codex leads in 0 categories and Replit in 1.
Code Generation
- OpenAI Codex
- 9.0
- Replit
- Not rated
Agentic Autonomy
- OpenAI Codex
- 8.8
- Replit
- Not rated
Ease of Use
Replit leads by 0.7- OpenAI Codex
- 8.3
- Replit
- 9.0
Value for Money
- OpenAI Codex
- 8.0
- Replit
- Not rated
Ecosystem & Integrations
- OpenAI Codex
- 8.5
- Replit
- Not rated
App Generation
- OpenAI Codex
- Not rated
- Replit
- 8.6
Deployment & Hosting
- OpenAI Codex
- Not rated
- Replit
- 8.8
Cost Predictability
- OpenAI Codex
- Not rated
- Replit
- 6.8
Collaboration
- OpenAI Codex
- Not rated
- Replit
- 8.2
Scores weigh documented features, plan value, platform coverage, integrations and user feedback. A missing score means we have not rated that area yet.
Pros and cons
OpenAI Codex
Pros
- Included with ChatGPT plans, with a free tier and an $8 Go tier
- Open-source CLI under the Apache-2.0 license
- Available in the terminal, VS Code-based editors, the ChatGPT desktop app and the cloud
- Supports MCP, skills, plugins and subagents
- API-key option lets teams pay at API rates instead of a subscription
Cons
- Plus has message limits per five hours that vary widely by model
- Cloud features are not available on the API Key plan
- Higher usage needs Pro, which starts at $100 per month
- Free and Go plans offer only GPT-6 Luna in the desktop app
Replit
Pros
- Builds, tests and publishes an app from one chat, with no local setup
- Free Starter plan with daily Agent credits and one published app
- Managed databases, Secrets and publishing are built into the workspace
- Handles web apps, mobile apps, slide decks, dashboards and videos
- iOS and Android apps for building and publishing from a phone
- Enterprise plan adds SAML SSO, SCIM and audit logging
Cons
- Agent and cloud usage are billed from credits, so monthly costs can exceed the plan price
- Starter published app goes down after 30 days and shows a Made with Replit badge
- Starter lacks Full build, Plan Mode, connectors and Replit AI Integrations
- Pro purchases and native iOS app builds require the website rather than the mobile app
Platforms
- WebOpenAI CodexSupportedReplitSupported
- WindowsOpenAI CodexSupportedReplitNot supported
- macOSOpenAI CodexSupportedReplitNot supported
- iOSOpenAI CodexNot supportedReplitSupported
- AndroidOpenAI CodexNot supportedReplitSupported
- APIOpenAI CodexSupportedReplitNot supported
- Browser ExtensionOpenAI CodexNot supportedReplitNot supported
- LinuxOpenAI CodexSupportedReplitNot supported
- CLIOpenAI CodexSupportedReplitNot supported
- VS Code ExtensionOpenAI CodexSupportedReplitNot supported
- JetBrains PluginOpenAI CodexSupportedReplitNot supported
Integrations
OpenAI Codex
8 integrations- GitHub
- Slack
- Visual Studio Code
- Cursor
- Windsurf
- Xcode
- JetBrains IDEs
- MCP
Replit
6 integrations- GitHub
- Stripe
- Linear
- MCP servers
- PostgreSQL
Company
- CompanyOpenAI CodexNot listedReplitReplit, Inc.
- FoundedOpenAI CodexNot listedReplit2016
- HeadquartersOpenAI CodexNot listedReplitFoster City, CA
- Monthly usersOpenAI Codex4M+ weekly usersReplitNot listed
- ListingOpenAI CodexNot claimedReplitClaimed
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Frequently asked questions
Is OpenAI Codex better than Replit?
It depends on your workflow. OpenAI Codex is built for delegating coding tasks to an agent. Replit is built for prototyping web apps from a prompt.
What are the key feature differences between OpenAI Codex and Replit?
OpenAI Codex: OpenAI's coding agent that writes, reviews and runs code from terminal, IDE, desktop or cloud. Replit: Describe an app in plain language and build, test and publish it in one browser workspace.
Does OpenAI Codex or Replit have a free plan?
Yes, both do. OpenAI Codex is freemium and Replit is freemium, and each has a free plan or trial.
Which is cheaper, OpenAI Codex or Replit?
Both can be used for free. Paid plans differ in limits and features, so compare the tiers in the pricing table above.