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OpenAI Codex on new websites

Agentic coding tool from OpenAI that writes, edits and reviews software from natural language instructions.

Sites using OpenAI Codex
7
since Aug 2026
Last 30 days
0.0%
of new sites, to Oct 20
no change on the 30 days before
Last 7 days
0.0%
of new sites, 7-day average
no change on the week before
Rank in Developer Tools
#141
of 509 tools, all time
First seen Aug 22, 2026
Last seen Oct 15, 2026
Website openai.com

What we found

  1. OpenAI Codex appeared on 5 new sites in the last 30 days.[1]

Share of new sites using OpenAI Codex

0.0000% 0.0002% 0.0004% 0.0006% 0.0008% 10 Sep Oct

The line is the 7-day average share of new sites that use OpenAI Codex, since 10 September.

Developer Tools on new sites

# Movement Tool Share of all sites Share of category Bar
1 – Vite 23.7% 98.5%
2 – pywb (Wayback Machine toolkit) 0.1% 0.3%
3 ▲1 Instant.page 0.1% 0.2%
4 ▼1 Weglot <0.1% 0.2%
5 ▲2 Rack CORS <0.1% 0.1%
…
141 ▲48 OpenAI Codex <0.1% <0.1%

All-time shares across the new sites we track: of all of them, and of the sites using any Developer Tools tool. Among September launches it ranked #133 in Developer Tools, up from #181 in August. All 509 in Developer Tools

Recently launched products built on OpenAI Codex

6 of the 7 sites using OpenAI Codex are product launches we list individually. The other 1 are new business and personal sites: they count towards the figures above but are not listed here. A watch sends them to you.

Site Found Also detected
People Data for AI Agents enrich.chat Oct 15 Next.js React Claude Code Cloudflare
Company Registry API - Free Tier companyregistryapi.com · Developer Tools Oct 8 Claude Code Cloudflare Google Analytics Google Search Console
The Last SaaS thelastsaas.com · Developer Tools Oct 7 Amazon SES Cloudflare Google Search Console Purelymail
CoreSpeed corespeed.io · AI Oct 4 Next.js React Anthropic Claude Code
Parallel - Web Infrastructure for AI Agents bestsearchapi.com Sep 29 Next.js React Vercel Claude Code
CaptureWeb · Web Rendering API captureweb.dev · Developer Tools Aug 22 Claude Code Cloudflare Cursor Tailwind CSS

Watches, exports and the API give you all 7 sites using OpenAI Codex, from £15 a month.

Notes

  1. These figures cover websites that went live since April 2026, not the web as a whole.

How this page is made

FirstSited looks at each new website near the day it goes live and records what it was built with. We do not go back later, so these figures describe what sites launch with, not what they run today. A site counts towards OpenAI Codex when we detect OpenAI Codex on it at that look.

Every share on this page is a proportion of the new sites we were tracking at the time. Sites we found across the wider web count towards the figures, but only product launches are listed by name. How we detect technologies · How we find new sites

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.