Building a Full Twitter Clone With Cursor Using Only Your Voice

Cursor's Composer agent mode lets you build functional web apps without writing code by hand. This walkthrough builds a Twitter clone from scratch, adds Google authentication and a Firebase database, and gets a working profile page running, all through voice prompts and iterative error fixing.

Starting From a Template

Open Cursor, click "Clone Repo," and paste in a starter template URL. This gives you a pre-configured project structure with routing and authentication scaffolding already in place.

Press Command+I to open Composer, then switch to Agent Mode. This is where the AI writes, modifies, and manages your entire codebase. Pair it with a voice-to-text app like Whisper Flow so you can speak your prompts instead of typing them.

Building the Interface

The first prompt asks the agent to recreate the Twitter interface with placeholder accounts for billionaires like Elon Musk, Mark Zuckerberg, Jeff Bezos, and Warren Buffett. The agent writes the code, creates the component files, and installs the necessary packages automatically.

To see the result, ask the agent to "run this locally." Enable YOLO mode so it executes terminal commands without asking for confirmation each time. When the localhost link appears, Command+click to open the app in your browser.

If there are errors (and there will be), copy the error message, paste it back into Composer, and tell it to fix the problem. This copy-paste-fix loop is the core workflow of vibe coding.

Adding a Real Database

To move past placeholder data, create a project on Google Firebase. Copy the project's API keys and paste them into Cursor. Then prompt the agent to connect the app to Firebase, enable Google sign-in, and store posts in Firestore.

After enabling authentication in the Firebase console, the app lets you sign in with Google. Your profile picture pulls from your Google account, and every post saves to the Firestore database in real time.

Adding a Profile Page

The final step adds a profile page where users can edit their bio, add a link, and set goals. One more voice prompt, one more agent run, and the feature is live.

Key Takeaways

• Cursor's Composer agent mode builds full apps from natural language prompts
• Voice-to-text tools like Whisper Flow turn spoken instructions into code changes
• The core workflow is: prompt, review, fix errors by pasting them back in
• Firebase handles authentication and database storage with minimal configuration
• YOLO mode lets the agent run terminal commands without manual approval

Resources

• Cursor -- AI-powered code editor with Composer agent mode
• Google Firebase -- Authentication, Firestore database, and hosting
• Whisper Flow -- Voice-to-text app for hands-free prompting