📘 This is Part 3 of a 5-Part Series:
How to Build A SaaS Business In 1 Weekend Using AI
Missed Part 1? Start Here → How to Build a SaaS in 1 Weekend (Part 1)

Part 3: Saturday

Build your SaaS app using your vibe coding prompt

Your goal today

• Build your app

• Test that it works

• Deploy it to a public link

• Stop once the core flow is working

You are not polishing.
You are not designing.
You are building what you already defined.

Step 1: Choose your AI builder (5 min)

You only need one.

If you’re unsure, use Base44.

Action:

• Pick one

• Create an account

• Log in

• Open a new project or workspace
  

Tutorials:

• Base44 Quickstart

• Replit AI Overview

• Lovable Demo

• Cursor Setup

Step 2: Paste your vibe coding prompt (5 min)

Open your builder.

Paste the full prompt you generated in Part 2.
Do not tweak it. Do not shorten it.

Action:

• Paste the full prompt

• Answer all follower up questions

• Wait for the AI to generate your app

• Save or rename the project

• Wait for build to complete
  

You now have a working app draft.

If something is missing, write a new prompt inside Base44.

Examples:

• Add a “Complete Task” button

• Show only completed items in a separate list

• Add a delete button for each item

• Add a “Profile” section that shows user email

One prompt = one change.

Step 3: Test your app’s core flow (10 min)

✅ Use an incognito window

Test:

• Signup

• Login

• Add item

• Use the main feature

• Log out & log back in

• Check if data saved

• Try all the features

• Refresh

✅ Repeat on your phone
Make sure the layout works on small screens.
Write down anything that breaks or feels confusing

Step 4: Fix what’s broken (15 - 30 min)

You’re only fixing what’s broken.
Do not add features. Do not redesign anything.

Copy the issue. Paste it into the chat. Say:

This didn’t work as expected. Here’s what I want it to do: [describe outcome].

Inside your builder, use short prompts like:

• “Fix the form width”

• “Make the button label say ‘Save session’”

• “The list doesn’t refresh when I add a new item.”

• “The layout breaks on mobile.”

If the app feels completely off, re-paste your original prompt and rebuild.

5) Deploy your app (≤20 min)

Most AI Vibe code builders let you host your project instantly: no separate setup needed.

Option 1: Host directly on your Vibe Coding tool
If you’re using Base44, Emergent, Replit, or Lovable, simply click Deploy or Share Live App. The platform will host your project on their domain

Option 2: Deploy to a third‑party host (optional)
If you want more control or plan to keep iterating after launch, export or connect your project to a hosting service like Vercel (free tier).

Steps:

1. Sign up at vercel.com

2. Connect your GitHub or upload your project folder

3. Click Deploy: you’ll get a public URL instantly (e.g. yourapp.vercel.app)

4. Future updates deploy automatically when you push new changes

Custom domain:
You can give your app a personal URL like yourapp.com instead of the free subdomain.

• Buy a domain on Namecheap 

• Or use your builder’s 1‑click domain purchase feature (Replit, Emergent, and Base44 support this)

• Follow their step‑by‑step connection guide (usually just copy/paste DNS records)

Once deployed:

✅ Test the public link on your phone and desktop
✅ Send it to a friend — see if they can use it without help
✅ Save the final link for tomorrow’s launch post

Step 5: Deploy your app (5 min)

All tools have a “Deploy” or “Share” button.

Action:

• Click deploy

• Copy the public link

• Open it in your phone and test again

• Save this link - you’ll use it tomorrow

Send the link to a friend.
See if they can figure it out.

This is your working draft.

Step 6: Clean your layout (10 min max)

Only do this if your core flow works.
Open the live link. Go screen by screen.

Look for:

• Unreadable text

• Misaligned elements

• Missing buttons or states

• Long or confusing labels

• Anything that feels “off”

• Page titles

Write prompts in Vibe Coding app like this:

Fix layout for mobile. Stack elements vertically.  
Use larger text. Add spacing between sections.
Rename “Submit” to “Add Task”.  
Make all button labels action-specific.

Keep layout simple. Use clear language.

Don’t:

• Add new screens

• Add new features

• Tweak fonts or colors

🧠 Practical Tips for Vibe Coding

• Be Clear and Specific: Skip vague commands like “Improve layout.” Tell the AI exactly what to do: for example, “Place the main action button below the form and center it.”

• Start Small: Launch a simple version first. Add features later using one short, clear prompt at a time.

• Test Frequently: Try every button, refresh the page, and use your phone to check the layout. Little tests now prevent big issues later.

• Guide the AI Like a Teammate: Give it feedback: “This doesn’t save correctly” or “The layout overlaps on mobile.”

• Learn from It: Ask, “Can you explain how this part works?” You’ll understand more each time you build.

• Keep Backups: Save or export your project regularly so you can return to a working state anytime.

• Use the Community: Check your builder’s help center, docs, or Discord: most problems have easy copy-paste fixes.

⚙️ Things to Watch Out For

• Bugs & Glitches: AI-generated code may look fine but still misbehave. Always test before showing others.

• Security: Don’t paste private API keys or user data directly into prompts. Use your builder’s “environment variable” feature instead.

• Temporary Storage: Many AI builders use non-permanent databases. Back up important data or connect to a service like Supabase later.

• Context Loss: As your project grows, the AI can forget details. Keep a brief “project summary” note handy to remind it what your app does.

• Code Clarity: Working doesn’t always mean clean. Once everything functions, ask the AI to “simplify and tidy up the code.”

💡 When You Need Extra Help

If you reach the point where you want a security review, custom features, or help deploying your app:

1. Save and export your latest build.

2. Write a short note describing what you’ve done and what you need help with.

3. Send it to a freelancer on platforms like Fiverr, Upwork, or Toptal.

Because you already have a working prototype, you’ll pay a fraction of the normal development cost… most finishing or deployment tasks cost under $50–$200.

Final checklist

You’re done for Saturday when:

• Signup and login works

• Add → view → update flow works

• Mobile version works

• You deployed the app

• You stopped at 3 features

• You saved your public link
  

It’s Real. Now It’s Time to Share It.
» Proceed to Part 4 → Launch and Get Feedback