How I Built an AI SaaS App in 24 Hours – And You Can Too!

Published on April 4, 2025

The world of AI-driven Software as a Service (SaaS) is booming, with the global SaaS market projected to reach $374.5 billion by 2028, according to Statista. One inspiring example of this trend is Siraj Raval’s recent success in building an AI legal document generator, InstantLegalAI, in just 24 hours while caring for his newborn son. His journey, detailed in this X post, shows how accessible AI tools can empower anyone—yes, even without coding skills—to launch a profitable SaaS app in record time.

What Did Siraj Do?

Siraj leveraged a team of AI tools to create InstantLegalAI:

• Claude 3.7 Sonnet for business strategy (acting as his CEO).
• V0 for designing a high-converting landing page.
• Cursor for full-stack development (building the app with a single prompt).
• ChatGPT for marketing strategy, including Google Ads optimization.

The result? Over $2,345 in revenue and a 9% click-through rate (3x the industry average) in just 24 hours, with a net profit of $1,843 after ad spend.

How You Can Build Your Own AI SaaS App

Inspired by Siraj’s approach, why not explore a niche like AI-powered resume builders? According to LinkedIn, 85% of job seekers need help optimizing their resumes for Applicant Tracking Systems (ATS). An AI tool could generate tailored resumes in minutes, saving users time and boosting their job prospects.

Here’s how you can get started:

1. Use Claude or ChatGPT to identify a high-demand niche (e.g., resume building).
2. Design a sleek landing page with V0, incorporating conversion elements like tiered pricing, scarcity timers, and trust badges.
3. Deploy the app with Cursor, using a prompt like: “Build a fully functional AI resume builder with Stripe payments, email notifications, and backend systems.”
4. Drive traffic with Google Ads, targeting keywords like “AI resume generator” or “free resume template.”

Important Considerations

While AI tools make development faster, the 2024 FTC report warns that AI-generated legal or critical documents (like resumes for sensitive industries) may lack compliance. Always consult professionals for high-stakes use cases to ensure accuracy and legality.

Check his source code for InstantLegal dot AI!

For hosting, consider Netlify—it’s free, supports custom domains, and auto-scales, making it perfect for testing your AI SaaS idea.