Every AI tool can now generate a web page. The harder question is where that page should live: who hosts it, whose domain it loads on, who can see it, and who keeps the record. That question is where most "just ship it from the AI tool" workflows quietly create problems for the people who have to approve them.
OpenAI's Codex Sites, launched in preview in June 2026, is a clear example of the pattern. It's a good product, and looking at exactly what it does (and doesn't do) is the cleanest way to explain what a hosting-and-distribution layer like HTMLVault is actually for.
What Codex Sites does
Codex Sites turns a prompt (or a compatible existing project) into a hosted web app with its own URL. You describe what you want, Codex builds it, validates the build, and deploys it. There's no separate hosting account to wire up and no deploy pipeline to babysit. The output runs on OpenAI-operated infrastructure, with optional storage for apps that need to remember things. For internal dashboards, planners, and review tools, it removes a real source of friction: the backlog where small internal apps go to die.
That convenience is genuine. If your goal is a workspace-private internal tool that your team opens and iterates on, Codex Sites is a reasonable way to get one fast.
What it doesn't do, and why that matters
Three properties of Codex Sites decide whether it fits a given job. None of them are flaws; they're design choices that define its lane.
It hosts on the AI vendor's infrastructure, not your domain. A Sites URL lives on OpenAI-operated hosting. There's no white-labeling onto your own domain, which matters for two reasons: branding, and email deliverability. A proposal or landing page that loads on a generic vendor host doesn't carry your brand, and links sent from your domain to a third-party host don't build your domain's sending reputation.
There's no static-HTML export. The Codex Sites verbs are create, save, deploy, and inspect, all inside the hosting environment. A deployed Site is a live app tied to a versioned build, not a portable file you can take somewhere else. If you ever want that work to live on infrastructure you control, there's no "download the HTML" button to hand you the artifact.
Access is gated and vendor-scoped. The preview is available to specific business and enterprise plans, and on enterprise an admin has to switch it on through role-based access controls before anyone can use it. The audience and the access model are defined by the AI vendor's account structure, not yours.
Generate anywhere, host where you own it
HTMLVault doesn't compete on generating HTML. Codex, and every other AI tool, can do that. It competes on the layer after: taking a finished HTML artifact and turning it into a link you control.
That means the page loads on your own domain (white-labeled), so it carries your brand and sends from your sending reputation rather than a vendor's. It means the content is scanned for personally identifiable information before it goes live. It means you get native interaction analytics (views, unique views, repeat views, scroll depth, time on page), plus the ability to inject your own tracking codes. And because the unit is a real HTML artifact, the work isn't trapped in any one vendor's account.
Notably, HTMLVault never has to be the thing that wrote the page. It's the thing that decides where the page lives once it exists. That's a deliberate split: the AI tools are interchangeable generators; the hosting and distribution layer is the part you don't want to re-decide every time you switch models.
Who this distinction is for
Sales and RevOps teams sending proposals, pricing, and dashboards to prospects need those links on the company domain, not a vendor host, and they need to know who opened them. Marketing teams building landing pages and email assets need deliverability tied to their own domain. And the IT and security stakeholders who sign off on all of it need PII scanning and an access record they can point to during a review. A workspace-private app inside an AI vendor's account answers none of those three.
The honest caveat
If what you want is a private, interactive internal app (one with stored state, sign-in tied to your AI workspace, and no need to live on your own domain), a vendor-hosted builder like Codex Sites may simply be the better tool, and HTMLVault isn't trying to be that. HTMLVault's unit is a hosted HTML document you distribute and measure, not a stateful multi-user application. Pick the layer that matches the job: a generator for building, an owned host for anything that needs your domain, your compliance record, and your analytics on it.
The reason this distinction exists as a product at all is a simple one. The convenient, unsanctioned way to share AI-generated work is always one click away. The version your IT team would actually approve, scanned, owned, logged, on your domain, usually isn't. HTMLVault is the second one.