Cmd J – ChatGPT for Chrome
Use ChatGPT on any tab without copy-pasting
Codex by OpenAI
AI that writes code for you
Updated July 2026
| Cmd J – ChatGPT for Chrome | Codex by OpenAI | |
|---|---|---|
| Rating | 5.0★ | 5.0★ |
| Reviews | 3 | 20 |
| Pros | 0 | 0 |
| FactScore™ | 30.1 | 66.1 |
FactScore™ Comparison
FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.
Pros & Cons
Only in Cmd J – ChatGPT for Chrome — Pros
No unique pros listedBoth tools — Pros
—Only in Codex by OpenAI — Pros
No unique pros listedOnly in Cmd J – ChatGPT for Chrome — Cons
—Both tools — Cons
—Only in Codex by OpenAI — Cons
—Details
| Cmd J – ChatGPT for Chrome | Codex by OpenAI | |
|---|---|---|
| Categories | AI Coding Agents, Writing assistants, Chrome Extensions | AI Coding Agents |
| Platforms | Web | Web |
| Added | February 21, 2023 | August 10, 2021 |
| Website | cmdj.app | openai.com |
Who Should Pick Which?
Choose Cmd J – ChatGPT for Chrome if...
- No unique pros listed
Choose Codex by OpenAI if...
- No unique pros listed
With a FactScore™ of 30.1 vs 66.1, Codex by OpenAI leads in community reception. Cmd J – ChatGPT for Chrome uniquely offers No unique pros listed, while Codex by OpenAI stands out for No unique pros listed.
What Users Say
Cmd J – ChatGPT for Chrome
I previously used Merlin, but it required manually copy/pasting, this extension does the job faster and is also free haha
Works really well, nice design. Love it.
I totally agree with this apps. Thank you so much.
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...
Related Comparisons
Frequently Asked Questions
Which is better, Cmd J – ChatGPT for Chrome or Codex by OpenAI?
Based on FactScore™, Codex by OpenAI leads with a score of 66.1 vs 30.1. Codex by OpenAI has a higher rating of 5.0★ compared to 5.0★.
What are the pros of Cmd J – ChatGPT for Chrome compared to Codex by OpenAI?
Cmd J – ChatGPT for Chrome uniquely offers: No unique pros listed.
What are the pros of Codex by OpenAI compared to Cmd J – ChatGPT for Chrome?
Codex by OpenAI uniquely offers: No unique pros listed.
Is Cmd J – ChatGPT for Chrome better rated than Codex by OpenAI?
Cmd J – ChatGPT for Chrome is rated 5.0★ from 3 reviews. Codex by OpenAI is rated 5.0★ from 20 reviews.
What is the FactScore™ of Cmd J – ChatGPT for Chrome and Codex by OpenAI?
FactScore™ weighs rating and review volume together. Cmd J – ChatGPT for Chrome scores 30.1 and Codex by OpenAI scores 66.1.
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