What You'll Build
- A flashcard study app with:
- Card flip animation showing question on front, answer on back
- Multiple decks organized by subject
- Progress tracking (mastered vs. still learning)
- Spaced repetition logic to resurface difficult cards
- Ability to add custom cards and decks
- Clean, distraction-free study interface
Tool: Lovable (no coding needed) Difficulty: Beginner Time: ~25 minutes Coding required: None
Flashcard apps are one of the most effective study tools ever made, and you're about to build your own. This app lets you create decks of cards, flip through them with a satisfying animation, and mark each card as "Got it" or "Still learning." Cards you struggle with come back more often thanks to built-in spaced repetition logic.
This project is ideal for vibe coding beginners because it covers core app patterns — state management, user interaction, data persistence — but the functionality is simple enough that AI tools nail it on the first try. You'll go from zero to a working study app in about 25 minutes.
What You Need
The Founding Prompt
Go to lovable.dev and start a new project. Paste this prompt:
Build a flashcard study app with the following features: DECK MANAGEMENT: - Home screen shows a grid of flashcard decks - Each deck has a title, card count, and progress indicator (e.g., "12/20 mastered") - Include 3 pre-built decks: "World Capitals" (15 cards), "Spanish Basics" (15 cards), "Science Facts" (15 cards) - Button to create a new deck with a custom title STUDY MODE: - Clicking a deck opens study mode showing one card at a time - Card displays the question/term on the front - Clicking the card flips it with a smooth 3D flip animation to reveal the answer - After flipping, show two buttons below the card: "Got it" (green) and "Still learning" (orange) - Clicking either button advances to the next card - Cards marked "Still learning" appear more frequently (simple spaced repetition) - Progress bar at the top showing cards reviewed out of total CARD MANAGEMENT: - Inside each deck, a button to add new cards (front text + back text) - Ability to edit or delete existing cards - Show card count in deck view UI DESIGN: - Minimal, focused design with a white/light gray background - Cards should be large, centered, with rounded corners and a subtle shadow - Use smooth transitions for all interactions - Purple accent color for buttons and progress indicators - Top navigation with back arrow and deck title during study mode - Responsive layout that works well on both desktop and mobile DATA PERSISTENCE: - Save all decks, cards, and progress to localStorage so nothing is lost on refresh - Track which cards are mastered vs. still learning per deck
Click Generate and wait for Lovable to build your app.
Step 1: Test the Core Study Flow
Open the preview and click into one of the pre-built decks. Flip through several cards, marking some as "Got it" and others as "Still learning." Verify the flip animation is smooth, the progress bar updates, and cards marked "Still learning" reappear. Go back to the home screen and check that progress persists.
Step 2: Add Spaced Repetition Logic
The basic "still learning" repeat is fine, but real spaced repetition is more effective. Let's upgrade the algorithm.
Improve the spaced repetition system: each card has a confidence level from 1 to 5. New cards start at 1. "Got it" increases confidence by 1. "Still learning" resets confidence to 1. Cards with lower confidence appear first in the study queue. Cards at confidence 5 are marked as "mastered" and only appear once every 10 study sessions. Show the confidence level as small dots (filled/unfilled) on the bottom of each card during study mode.
Step 3: Add a Deck Creation Wizard
Let's make it easy to create decks with multiple cards at once instead of one by one.
Add a deck creation wizard: when creating a new deck, show a form where the user can add multiple cards at once. Each row has a "Front" and "Back" text field. Include a "+ Add another card" button to add more rows. Minimum 3 cards per deck. Add a "Quick Import" textarea option where the user can paste cards in "front | back" format (one card per line) for bulk creation. Show a preview count: "12 cards ready to add."
Step 4: Improve the Card Flip Animation
The flip works, but let's make it feel premium with better visual details.
Enhance the card flip animation: add a slight 3D perspective tilt, the card should have a different background color on front (white) vs back (light purple). Add a subtle shadow that shifts during the flip. The front of the card should show a small "?" icon in the corner, the back should show a "✓" icon. Add a swipe gesture for mobile: swipe right for "Got it" and swipe left for "Still learning" with a color indicator showing green or orange as the user swipes.
Step 5: Add Sound Effects
Subtle audio cues make the app more engaging during long study sessions.
Add sound effects using the Web Audio API (no external files). Play a soft "flip" sound when the card turns over, a positive ding when marking "Got it", a neutral tap when marking "Still learning", and a celebration chime when all cards in a deck reach mastered status. Add a sound toggle button (speaker icon) in the top navigation. Sounds should be off by default.
Step 6: Add Study Statistics
Tracking study habits keeps users motivated and coming back.
Add a statistics screen accessible from the home page. Show: total cards studied today, total study time today, cards mastered this week (bar chart with 7 days), longest study streak (consecutive days), and overall mastery percentage across all decks. Store all stats in localStorage. Show a small "🔥 3 day streak" badge on the home screen if the user has studied on consecutive days.
Step 7: Deploy and Share
Your flashcard app is ready to share. Click the Publish button in Lovable to deploy your app to a live URL. You can share the link with classmates or study groups. Lovable provides a free subdomain, or you can connect a custom domain from your project settings.
Level Up Your Game
Try these follow-up prompts to make your app even better:
Add difficulty levels:
Add a difficulty tag to each card (Easy, Medium, Hard) that the user can set when creating cards. Add a filter in study mode to study only cards of a specific difficulty. Show difficulty as a colored dot on each card: green for Easy, yellow for Medium, red for Hard.
Add a timer:
Add an optional timed study mode: the user sets a study duration (5, 10, 15, or 30 minutes) before starting. Show a countdown timer at the top. When time runs out, show a summary of cards reviewed, correct answers, and cards remaining. Save the session to statistics.
Add animations:
Add entrance animations: cards should slide in from the right when advancing and slide out to the left. The progress bar should animate smoothly. When a card reaches mastered status, show a brief golden glow animation around the card. Add a subtle bounce animation to the "Got it" and "Still learning" buttons on hover.
Add high score saving:
Track study session scores in localStorage. A session score is the percentage of cards answered "Got it" on the first try. Show a "Personal Best" badge on the deck card if the last session beat the previous best. On the statistics page, show the best score per deck.
Add deck sharing via URL:
Add an "Export Deck" button that generates a shareable URL containing the deck data encoded in the URL hash. When someone opens that URL, the app imports the deck automatically and shows a confirmation: "Imported deck: World Capitals (15 cards)." Also add a manual import option with a text field for pasting exported URLs.
Want persistent high scores? Follow our leaderboard guide to connect your game to a database.
Common Errors
Blank screen after prompt If Lovable generates a blank screen, add to your prompt: "Make sure the game renders immediately on page load with no user setup required."
Game not responding to keyboard Add to your prompt: "Ensure keyboard event listeners are attached to the document, not a specific element. Auto-focus the game container on load."
Mobile touch controls not working Add to your prompt: "Add touch event handlers for mobile. Include visible on-screen buttons for all controls on screens under 768px wide."