Replit is a browser-based collaborative IDE and cloud hosting platform that has added AI coding features (Replit AI, previously Ghostwriter) to help developers build and deploy applications entirely in the browser — from writing code to running servers to deploying production apps without any local setup. It's particularly popular in education, competitive programming, and with developers who need a zero-setup environment for prototyping or collaboration. Replit can deploy web servers, databases, and static sites from the same workspace. Apps deployed on Replit are served from *.repl.co or *.replit.app domains with Replit-specific server headers, and the Replit runtime injects platform-specific variables into the environment. Replit's free tier is generous, with Core plans at $20/month for more compute and storage.
Paste any URL to instantly detect whether it was built with Replit AI. Our engine checks 7 technical signals.
Replit AI is used across many industries. These are the most common website types built on this platform:
Solo founders
Build and ship full-stack apps from natural language prompts
Early-stage startups
Validate ideas with working prototypes instantly
SMBs
Create internal tools without hiring developers
Developers
Bootstrap projects faster with AI assistance
Every Replit AI website leaves distinctive technical fingerprints. Here's what to look for:
CDN Domains
Network requests to these domains are a reliable indicator:
repl\.coreplit\.comJavaScript Patterns
2 script patterns linked to Replit AI
HTML Attributes
2 HTML patterns in the page source
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