Codex by OpenAI
AI that writes code for you
Replit
Idea to app, fast.
Updated February 2026
| Codex by OpenAI | Replit | |
|---|---|---|
| Rating | 5.0★ | 4.6★ |
| Reviews | 20 | 42 |
| Pros | 0 | 8 |
| FactScore™ | 66.1 | 74.6 |
FactScore™ Comparison
FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.
Pros & Cons
Only in Codex by OpenAI — Pros
No unique pros listedBoth tools — Pros
—Only in Replit — Pros
Easy to use AI agent Fast deployment Prototype creation No setup required Browser-based IDE Collaborative development HostingOnly in Codex by OpenAI — Cons
—Both tools — Cons
—Only in Replit — Cons
Pricing complaints Buggy AI Limited free plan Confusing interface Not recommended for beginnersDetails
| Codex by OpenAI | Replit | |
|---|---|---|
| Categories | AI Coding Agents | AI Coding Agents, Vibe Coding Tools |
| Platforms | Web | Web · iOS · Android |
| Became Popular | August 10, 2021 | August 3, 2021 |
| Website | openai.com | replit.com |
Who Should Pick Which?
Choose Codex by OpenAI if...
- No unique pros listed
Choose Replit if...
- Easy to use
- AI agent
- Fast deployment
With a FactScore™ of 66.1 vs 74.6, Replit leads in community reception. Codex by OpenAI uniquely offers No unique pros listed, while Replit stands out for Easy to use and AI agent.
What Users Say
Codex by OpenAI
Even with new models around, Codex remains one of the most reliable AI coding assistants—fast, structured, and still very useful.
Still the fastest way to get a working regex or a complex utility function from a single-line comment.
OpenAI Codex has become an essential part of our development workflow. With our AGENTS.md providing project context, Codex understands our monorepo architecture and coding conventions, autonomously...
Replit
The best tool for coding with AI, especially for semi-technical talent like myself! When this idea was presented to me I could explain the basics of what it would require, but I was nowhere near pr...
We used Replit to power our Developer Kit, as it was easy-to-use and powerful. You can literally spin up your own DIMO integrated app in under 60 seconds.
Replit made it easy to go from code to launch, including a super simple database, SSL, and everything else needed for an MVP.
Related Comparisons
Frequently Asked Questions
Which is better, Codex by OpenAI or Replit?
Based on FactScore™, Replit leads with a score of 74.6 vs 66.1. Replit has a higher rating of 4.6★ compared to 5.0★.
What are the pros of Codex by OpenAI compared to Replit?
Codex by OpenAI uniquely offers: No unique pros listed.
What are the pros of Replit compared to Codex by OpenAI?
Replit uniquely offers: Easy to use, AI agent, Fast deployment, Prototype creation, No setup required.
Is Codex by OpenAI better rated than Replit?
Codex by OpenAI is rated 5.0★ from 20 reviews. Replit is rated 4.6★ from 42 reviews.
What is the FactScore™ of Codex by OpenAI and Replit?
FactScore™ weighs rating and review volume together. Codex by OpenAI scores 66.1 and Replit scores 74.6.
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