--- title: I Built A SaaS App With ONE PROMPT | daily.dev description: A creator demonstrates building a custom SaaS-style analytics dashboard using OpenAI's Codex app and its new 'Sites' feature, prompted from within ChatGPT. The... canonical: https://daily.dev/posts/i-built-a-saas-app-with-one-prompt-ul6zegahg twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: I Built A SaaS App With ONE PROMPT | daily.dev og:description: A creator demonstrates building a custom SaaS-style analytics dashboard using OpenAI's Codex app and its new 'Sites' feature, prompted from within ChatGPT. The... og:url: https://daily.dev/posts/i-built-a-saas-app-with-one-prompt-ul6zegahg og:image: https://api.daily.dev/og/posts/uL6ZEgaHG.png og:image:alt: I Built A SaaS App With ONE PROMPT og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # I Built A SaaS App With ONE PROMPT **[Matt Wolfe](https://daily.dev/sources/mreflow)** · 1 min read · 0 upvotes · 0 comments ## Summary A creator demonstrates building a custom SaaS-style analytics dashboard using OpenAI's Codex app and its new 'Sites' feature, prompted from within ChatGPT. The dashboard aggregates audience metrics across YouTube, Instagram, TikTok, LinkedIn, X, newsletter, and Facebook into one shareable team view. Sites automatically handles hosting, authentication, database, custom domains, and analytics, and a new web MCP feature lets compatible AI agents perform specific actions on the site instead of blindly navigating the UI. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is the Codex Sites feature in ChatGPT and what does it handle for you? Codex Sites is a feature inside the ChatGPT Codex app that lets you build a working web app from a single prompt, and it automatically manages hosting, authentication, and the database for you. You can also connect a custom domain and view built-in analytics like visitors and page views without setting up separate infrastructure. _Developers weighing prompt-based app builders against traditional stacks can track releases like this on daily.dev._ ### What does web MCP let AI agents do on a website built with Codex Sites? Web MCP lets developers define specific actions within a site that compatible AI agents can call directly, rather than having the agent blindly click around the interface trying to figure out how to use it. This gives AI agents a structured way to interact with custom-built software instead of relying on guesswork navigation. _Anyone building agent-compatible interfaces can follow MCP ecosystem developments on daily.dev._ --- Tags: [#ai-agents](https://daily.dev/tags/ai-agents), [#chatgpt](https://daily.dev/tags/chatgpt), [#nocode](https://daily.dev/tags/nocode), [#vibe-coding](https://daily.dev/tags/vibe-coding) [View this post on daily.dev](https://daily.dev/posts/i-built-a-saas-app-with-one-prompt-ul6zegahg) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"I Built A SaaS App With ONE PROMPT","url":"https://daily.dev/posts/i-built-a-saas-app-with-one-prompt-ul6zegahg","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/i-built-a-saas-app-with-one-prompt-ul6zegahg"},"datePublished":"2026-09-01T14:43:10.061Z","dateModified":"2026-09-01T14:43:29.841Z","description":"A creator demonstrates building a custom SaaS-style analytics dashboard using OpenAI's Codex app and its new 'Sites' feature, prompted from within ChatGPT. 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