Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Heads Up!
It's the game The New York Times called a "Sensation!" and Cosmopolitan raved “Your existence is dull and meaningless without this life-changing app!”
$1.99 · In-app purchases
OVERALL US RANK
#3
Paid · all categories
REVENUE (Est)
$2.2M/mo
$1.3M - $3.1M
RATING
★ 4.8
295,611 ratings · Top 5%
Evidence scope: #3 is the current overall US Paid chart position. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Heads Up!: map the core Games workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Introduce user-generated content with custom decks and community sharing.
Assumption to check: Limited categories can lead to repetitive gameplay
Validate with people who use this workflow before building.
Hypothesis 2
Add a multiplayer mode for friends to play together.
Assumption to check: No multiplayer feature
Validate with people who use this workflow before building.
Hypothesis 3
Provide clear explanations and previews of premium content.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Offer an ad-free experience for a one-time purchase or subscription.
Assumption to check: Ads can disrupt gameplay experience
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
It's the game The New York Times called a "Sensation!" and Cosmopolitan raved “Your existence is dull and meaningless without this life-changing app!” Get ready for endless fun with Heads Up!, the exhilarating charades-style party game that's taking the world by storm. Guess the words on the screen as your friends and family shout out clues. With diverse categories ranging from Celebrities to Movies and Hilarious Accents, Heads Up! guarantees hours of laughter for everyone involved. How to Play: 1. Select from over 100 themed decks or create your own custom category! 2. Hold the phone to your forehead and let the word guessing commence! 3. Tilt down for correct answers and up to pass on challenging words. 4. Keep the fun rolling with an extensive library of engaging trivia cards! Decks You’ll Get: - Celebrity Quiz - Blockbuster Movies - Animals - Accents - Superheroes - Famous Characters - And lots more! Features: - Enjoy group play with friends, team, or even hundreds of players simultaneously. - Draw new word cards with a simple tilt of your phone. - Keep priceless memories by recording gameplay videos to keep for yourself or share on social media - Entertain everyone from trivia buffs to casual players with various difficulty levels. - Updated frequently with seasonal and topical fun, plus huge brands like Harry Potter, Marvel, Seinfeld, Friends, Star Wars, and much more! Heads Up! is the ultimate party game that combines the best elements of charades, trivia, and light-hearted team competition. Whether you're looking to liven up a family gathering or a game night with friends, this app is your ticket to endless fun. It's your super-affordable way to bring joy and laughter to any occasion. Download Heads Up! now and let the unforgettable guessing games begin!
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
react-navigation
@react-native-async-storage/async-storage
shadcn/ui
expo-linear-gradient
BUILD KIT DIFFICULTY
Intermediate
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
