ChatGPT Sites (Codex) vs Replit: Free Hosting vs the All-in-One Builder

If you've heard people say "Codex Spaces" lately, they mean Sites: OpenAI's built-in hosting for things you make with Codex or ChatGPT. You describe a site or small app, Codex builds it, and it gets a live URL on OpenAI's servers. No Vercel account, no deploy step.

That puts it right next to Replit, which has done "describe it, build it, host it" for years. Here's how they compare for a solo builder who wants something live and in front of people.

Short version: Sites is the cheapest way to get a small app live right now (hosting is free through December 31, 2026) if you already pay for ChatGPT. Replit is the more complete all-in-one workspace, but its usage-based billing is the most common complaint we see. Both make it easy to start and take real work to leave.

What Sites is (and what it isn't)

• Launched as a preview in the Codex app on June 2, 2026, then a public beta on July 13 (OpenAI's Jason Liu). OpenAI says people created over 5 million sites in its first three months.
• Same product, three names. "ChatGPT Sites," "Codex Sites" and "OpenAI Sites" all refer to it. There's no separate product called Codex Spaces. (ChatGPT Space, singular, is a different thing: the shared pages-and-files area that replaced Library.)
• What it hosts: websites, dashboards, small web apps and games, with an optional database (up to 10 GB per site) and file storage. It speaks HTTP, HTTPS and WebSockets. OpenAI's own docs say some frameworks, databases and background services aren't supported.
• Who can use it: Plus, Pro, Business, Enterprise and Edu. Not the Free or Go plans.

The sign-in question

This is the part that trips people up.

• New sites are private by default. Only you (and workspace admins) can open them.
• You can make a site public, and then anyone can open it without a ChatGPT account.
• You can share privately with named people, but they have to sign in with the account you invited.
• You can add "Sign in with ChatGPT" to your own app so visitors log in with their OpenAI account.

So "it requires sign-in" is true only until you decide otherwise. Before you post a link anywhere, open it in an incognito window and make sure a stranger can actually see it. Details are in OpenAI's publish and share docs.

Pricing, side by side

Sources: Sites docs, OpenAI Help Center, Replit pricing, Replit Starter plan docs. Prices change often; check before you commit.

Replit's billing is where the frustration is. In r/replit this year, one builder said their average spend had climbed to $60 a day on top of a $100/month plan, and another said they'd been moved from $40 to $100 a month when a promotion they didn't remember signing up for ended. Replit did cut hosting prices for apps at scale by more than 50% in August, but Agent build costs are still the unpredictable part.

To be fair to Replit, leaving doesn't automatically save money. One commercial user switched to Codex plus Claude Code and found they could burn through a five-hour limit in 20 to 30 minutes. Their conclusion: Replit is expensive, and so are the alternatives once you build at the same pace.

Pros and cons

ChatGPT Sites

Pros

• Free hosting for the rest of 2026 if you already pay for ChatGPT.
• No separate account, deploy pipeline or hosting dashboard.
• You build in Codex, so you get Codex's planning, image generation for mockups, and a real repo on your machine.
• Easy private sharing for feedback before you go public.

Cons

• Not on the free ChatGPT plan.
• The runtime is narrower than a general cloud host. Background jobs and some frameworks won't work.
• Hosting pricing after January 1, 2027 is still labeled "proposed" in OpenAI's docs.
• Your site's settings live in an .openai/hosting.json file tied to OpenAI's hosting, and the database and file storage are OpenAI-managed. Moving later means exporting data and re-hosting.
• Sites started as a team and internal-tools product. Public-facing launch features (SEO, analytics) are on you.

Replit

Pros

• The fastest start for a beginner: editor, agent, database, auth, hosting and collaboration in one tab.
• Mature. Lots of tutorials, templates and community help.
• A real free plan you can publish from (with limits).

Cons

• Effort-based Agent billing is hard to predict, and it's the number one complaint in r/replit.
• The more Replit services you use (Replit Auth, Replit's database, Secrets, App Storage), the harder it is to leave. See our guide to moving off Replit.
• Support stories about frozen databases and account issues come up often enough to plan for a backup.

Which should you pick?

• You already pay for ChatGPT and want a small tool or landing page live this week: start with Sites. Make it public, test it signed out, and enjoy the free hosting.
• You're brand new to building and want everything in one tab: Replit is still the gentlest on-ramp. Set a spending limit on day one.
• You expect real traffic, payments or a long life: use either one to prototype, then plan to put the code in GitHub and host it somewhere you control (Vercel, Netlify, Cloudflare, Render) with a standard Postgres database.

Whichever you choose, keep an exit open from day one: connect GitHub, keep secrets in environment variables, and take database exports. And before you share the link anywhere, check the parts no builder does for you: a working signup, analytics, a privacy page, and a site that makes sense to a stranger. The free LaunchBuddy scan reads your live URL, wherever it's hosted, and shows you the gaps.