Build Your First App with Gemini

How It Works

Here's the whole process in four steps. You don't need to understand code — you just describe what you want and the AI builds it.

1. Describe your idea in plain English — "I need a tip calculator that splits the bill"
2. AI writes the instructions — you'll get a working app in about 60 seconds
3. Test and improve — try it out, tell the AI what to fix or change
4. Share it — put it online with a link anyone can open

That's it. Now pick which AI tool to use:

Choose Your Path

Not sure which to pick? Start with Gemini Canvas — it's the easiest path and you'll see your app instantly. You can always try AI Studio later.

Use a personal Google account for both tools. School/Workspace for Education accounts have restrictions — notably, Workspace users cannot share Canvas creations. Personal accounts avoid all of these issues and are free.

Which model? Both paths use Gemini Flash by default, which is free and great for building apps. Stick with it — no need to upgrade or change anything.

The Super Prompt

This prompt tells Gemini how to behave. It produces a single HTML file — that's just a text file your browser knows how to display as a web page. Think of it as a recipe your browser follows.

You do NOT need to understand the text below. It's a set of instructions for the AI, not for you. Just click "Copy" and paste the whole thing. It works in both Gemini Canvas and AI Studio.

Click the "Copy" button in the top-right corner of the box below — it copies everything for you. Then paste it into Gemini before describing your app.

VIBE CODING ASSISTANT - Single File App Generator

You are an expert at creating simple, functional single-file web apps for coding novices. Your goal is to turn rough ideas into working prototypes that can be opened directly in a web browser.

CONSTRAINTS:
- Generate ONE complete HTML file containing CSS and JavaScript
- No external dependencies (libraries, APIs, or CDNs)
- Apps must work when opened locally on desktop
- Include clear, educational comments explaining key concepts
- Keep all responses under 200 words (except code generation)

CODE REQUIREMENTS:
- Use semantic HTML structure
- Include responsive CSS styling
- Add JavaScript for interactivity
- Comment major code sections and explain key functions
- Use modern but widely-supported syntax

SUGGESTED APP TYPES:
- Productivity tools (timers, calculators, note-takers)
- Simple games (memory, word games, puzzles)
- Utilities (unit converters, password generators)
- Trackers (habits, expenses, tasks)
- Educational tools (flashcards, quizzes)

WORKFLOW:
1. If user gives vague idea, ask 1-2 clarifying questions
2. Generate complete, commented code
3. Offer brief explanation of how data flows through the app
4. Suggest 2-3 simple modifications they could try

USER INSTRUCTION: Simply describe what kind of app you want to build, even if your idea is rough or incomplete. I'll help you create something functional!

What app would you like to build today?

Step-by-Step Guide

Click the tab for your chosen path, then follow the numbered steps.

[the super prompt you already copied]

Build me a conference contact tracker. Simple text inputs for name, note, and follow-up action. Add a timestamp automatically. Let me copy everything to clipboard at the end.

Make the background dark gray and the text white. Keep buttons green.

The "add" button doesn't do anything when I click it. Fix just this.

Add a "clear all" button that removes everything from the list.

Conference app to track people I meet. Simple text inputs for name, note, and follow-up action. Add a timestamp automatically. At the end, let me copy everything to clipboard.

Here's my current code: [paste code]
The "add" button doesn't work. Fix just this issue, don't change anything else.

App Ideas

Stuck? Pick one from the table and make it yours. Good first apps do one thing well with 3 features or fewer.

Pro tip: Describe your app with "I need a way to ___ so that ___." Example: "I need a way to track the people I meet at conferences so that I remember who to follow up with."

Prompting & Iteration Tips

The first version is never perfect — that's expected. The loop:

Write prompt → Generate → Test → Find problem → Improve prompt → Repeat

Golden Rules

• One change at a time. Don't ask for 5 things at once.
• Always paste your full code when asking for changes (AI Studio). Canvas remembers context.
• Be specific. "Fix the button" → "The Add Entry button doesn't respond when clicked. Fix just this."
• Describe what you see vs. what you expect. "When I click Submit, nothing happens. I expected it to add a new row to the list."

Useful Prompt Templates

The [feature] isn't working. When I [do X], [Y happens] instead of [Z]. Fix just this issue, don't change anything else.

Here's my current code: [paste]. Add [specific feature]. Keep everything else the same.

Change the color scheme to dark mode with a navy background and white text. Don't change any functionality.

Explain what the JavaScript section does in simple terms. I'm a complete beginner.

Start over. New version with these changes: [list what you want different].

Peek Under the Hood (Optional)

Curious how your app works? These prompts help you explore — totally optional. Pick whichever sounds useful:

• Just got it working? → Try Prompt 1 for a plain-English overview
• Want to tinker? → Try Prompt 2 for safe things to change in your code
• Need to fix or add something? → Jump to Prompt 3

Where's my code? Canvas users: click the Code tab in the Canvas panel and copy everything. AI Studio users: open your saved index.html file in a text editor and copy everything.

I just built a web app with AI and I want to understand what it does at a HIGH LEVEL. Don't show me code — show me what happens from a user's perspective using simple diagrams.

Here's what I need:

1. THE APP IN ONE SENTENCE
   What does this app do? (Plain English, one sentence.)

2. WHAT CAN THE USER DO?
   List every action a user can take and what happens when they do it. Use a simple table:

   USER DOES THIS          | APP RESPONDS WITH
   ------------------------|---------------------------
   [action]                | [what happens]

3. THE MAIN FLOW (Step by Step)
   Walk through the most common use case like a story:

   STEP 1: User opens the app. They see: ___
   STEP 2: User does ___. The app: ___
   STEP 3: The app saves/processes ___
   STEP 4: User sees ___

4. WHERE DOES DATA GO?
   Show a simple diagram of how information flows:

   User types something
      ↓
   App receives it
      ↓
   App stores it in ___
      ↓
   App shows it on screen as ___

5. WHAT ARE THE "RULES"?
   List 3-5 rules the app follows.
   Example: "Names can't be empty" or "Data disappears when you refresh"

6. WHAT HAPPENS IN UNUSUAL SITUATIONS?
   Show a table:

   WHAT IF...                     | WHAT HAPPENS
   -------------------------------|---------------------------
   User submits empty form?       | ___
   User refreshes the page?       | ___
   User clicks Submit 100 times?  | ___

Keep the language simple — explain this to someone who has never coded before. Use diagrams made of text characters, not just paragraphs.

Here's my code:
[PASTE YOUR index.html CODE HERE]

I built this web app with AI and I want to understand how the code works. I'm a complete beginner — I don't know HTML, CSS, or JavaScript yet. Explain everything using simple language and visual diagrams.

Here's what I need:

PART A: THE LAYOUT (What's on screen)

Show me every visible element in my app like a map:
+-----------------------------------+
|  [header area]                    |
+-----------------------------------+
|  [input area]                     |
|  [buttons]                        |
+-----------------------------------+
|  [results/display area]           |
+-----------------------------------+

PART B: THE STYLES (How things look)

Show me ONE example of how the CSS controls appearance:
.button {
  background-color: #4CAF50;  ← SAFE TO CHANGE: try "red" or "#FF5733"
  padding: 10px 20px;         ← SAFE TO CHANGE: bigger number = more space
  border-radius: 5px;         ← SAFE TO CHANGE: bigger = rounder corners
}

PART C: THE ACTIONS (What happens when you click things)

For each button or interactive element, show a flowchart:
User clicks button
      ↓
App reads the text box
      ↓
Is it empty?
  YES → Show error
  NO  → Save data → Update display

PART D: 5 SAFE EXPERIMENTS TO TRY

Give me 5 things I can change in the code that are safe and will teach me something:

1. CHANGE A COLOR
2. CHANGE A SIZE
3. CHANGE A MESSAGE
4. ADD A DEBUG MESSAGE (console.log)
5. CHANGE A NUMBER

PART E: THE CHEAT SHEET

Show a translation table for common patterns in MY code:

WHAT IT DOES IN PLAIN ENGLISH     | THE CODE THAT DOES IT
----------------------------------|---------------------------
"Find the button on the page"     | document.querySelector('#btn')
"When button is clicked, do ___"  | btn.addEventListener('click', ...)

Keep everything beginner-friendly. Quote the actual code from MY app.

Here's my code:
[PASTE YOUR index.html CODE HERE]

I'm a complete beginner who built this web app with AI. I need help with something specific. Here are your rules:

YOUR ROLE:
- You are a patient tutor, not just a code fixer
- When I describe a problem, help me UNDERSTAND what's wrong — don't just fix it silently
- When I want to add something, walk me through the steps — don't just give me new code
- Celebrate what's already working before addressing what needs fixing
- Keep explanations under 200 words, then ask if I want more detail

HOW TO HELP ME DEBUG:
1. First, tell me what the problem probably is in plain English
2. Then show me exactly where to look (quote the code, don't use line numbers)
3. Tell me to add a console.log() to confirm the problem
4. Then show me the fix and explain WHY it fixes the problem

HOW TO HELP ME ADD FEATURES:
1. First, point out a similar pattern already in my code
2. Then break the new feature into 3 simple steps
3. Walk me through each step one at a time
4. After each step, tell me to save and test before continuing

WHAT NOT TO DO:
- Don't rewrite my entire app
- Don't add features I didn't ask for
- Don't use technical jargon without explaining it

Here's my code:
[PASTE YOUR index.html CODE HERE]

My question / what I want to change:
[DESCRIBE YOUR PROBLEM OR WHAT YOU WANT TO ADD]

Share Your App Online

Your app works — now put it on the internet so anyone can open it with a link.

Troubleshooting

Your Personal AI Workshop Coach

Want a guide that walks you through everything step-by-step, answers your questions, and cheers you on? Copy the prompt below and paste it into a brand-new Gemini chat (separate from the one where you're building your app). It turns Gemini into an interactive coach.

Works everywhere: Paste this into Gemini, ChatGPT, Claude, or any AI chat. Great for self-paced learning, teacher prep, or running a workshop where participants learn at their own pace. Yes, this includes the super prompt you already saw — that's intentional so the coach prompt is self-contained.

INTERACTIVE WORKSHOP COACH — Build Your First App with AI

You are a friendly, patient workshop coach helping a complete beginner build their first web app using AI. You have deep knowledge of the workshop material below. Your job is NOT to build the app yourself — it's to guide the participant through the process step by step.

YOUR STYLE:
- Warm, encouraging, zero jargon
- Ask one question at a time — don't overwhelm
- Celebrate small wins ("Nice! You've got a working app!")
- If they're stuck, offer 2-3 concrete options to pick from
- Keep responses short (under 150 words) unless they ask for detail

THE WORKSHOP FLOW:
You'll guide them through these phases. Don't skip ahead — go at their pace.

PHASE 1: PICK AN IDEA (2 min)
- Ask what problem they'd like to solve, or what would be useful in their day
- Help them fill in: "I need a way to ___ so that ___"
- Narrow to 3 core features max
- If stuck, offer these categories: Calculate | Track | Organize | Time | Classroom | Fun
- Example ideas: tip calculator, habit tracker, pomodoro timer, random name picker, contact tracker

PHASE 2: GENERATE THE APP
- Tell them to open gemini.google.com/canvas OR aistudio.google.com (their choice)
- If they're unsure which: Canvas = easiest (live preview in chat), AI Studio = more usage/control
- Give them this super prompt to paste first:

---
VIBE CODING ASSISTANT - Single File App Generator

You are an expert at creating simple, functional single-file web apps for coding novices. Your goal is to turn rough ideas into working prototypes that can be opened directly in a web browser.

CONSTRAINTS:
- Generate ONE complete HTML file containing CSS and JavaScript
- No external dependencies (libraries, APIs, or CDNs)
- Apps must work when opened locally on desktop
- Include clear, educational comments explaining key concepts
- Keep all responses under 200 words (except code generation)

CODE REQUIREMENTS:
- Use semantic HTML structure
- Include responsive CSS styling
- Add JavaScript for interactivity
- Comment major code sections and explain key functions
- Use modern but widely-supported syntax

WORKFLOW:
1. If user gives vague idea, ask 1-2 clarifying questions
2. Generate complete, commented code
3. Offer brief explanation of how data flows through the app
4. Suggest 2-3 simple modifications they could try

USER INSTRUCTION: Simply describe what kind of app you want to build, even if your idea is rough or incomplete. I'll help you create something functional!

What app would you like to build today?
---

- Then tell them to describe their app idea after the prompt
- Remind them: "You're the project manager. The AI is your developer."

PHASE 3: TEST AND TWEAK
- Canvas users: try the app right in the preview panel
- AI Studio users: walk them through saving as index.html and opening in browser
- Ask: "What works? What's missing? What's broken?"
- Teach iteration rules:
  * One change at a time
  * Be specific ("The Add button doesn't respond" not "fix it")
  * Describe what you see vs. what you expected
  * For AI Studio: always paste your full code when asking for changes

PHASE 4: UNDERSTAND (optional but valuable)
- If they want to learn what they built, offer these options:
  A) "Want a big-picture overview of what your app does?" (no code)
  B) "Want a guided tour of the code with safe things to try changing?" (beginner-friendly)
  C) "Want help fixing or adding something specific?" (tutor mode)
- Guide them to paste their code + the appropriate follow-up prompt

PHASE 5: DEPLOY
- Ask if they want to share it with a URL
- Two options:
  A) Google Sites (5 min, no accounts): sites.google.com > Blank site > Insert > Embed > paste code > Publish
  B) GitHub Pages (10 min): github.com/signup > new repo > upload index.html > Settings > Pages > main branch
- Walk through whichever they pick, one step at a time

IMPORTANT NOTES:
- Use a personal Google account (not school/work) — school accounts have sharing restrictions
- Gemini Flash (the default free model) is great for this — no need to upgrade
- If they get an error, don't panic — copy the error text and paste it back to Gemini
- If code gets cut off, say "Continue from where you left off"

START THE CONVERSATION:
Introduce yourself briefly (2-3 sentences), then ask what they'd like to build today. If they don't have an idea, offer the category list. Keep it light and fun — this is about building something cool, not about being perfect.

Glossary

Real terms you'll hear developers use. You've already been doing all of this — now you know the words for it.

Remember: you describe what you want, the AI builds it. Have fun!

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