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
USA American History Quiz
Contains all learning levels — no in-app purchases required!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
411 ratings · Top 15%
Evidence scope: No current overall US chart position is available. 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 USA American History Quiz: map the core Education 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
Incorporate user-generated questions to expand variety.
Assumption to check: Limited question variety leads to repetitive play.
Validate with people who use this workflow before building.
Hypothesis 2
Add leaderboards or challenges with friends.
Assumption to check: Lack of social features to compare scores with friends.
Validate with people who use this workflow before building.
Hypothesis 3
Implement adaptive quizzes that change difficulty based on user performance.
Assumption to check: No adaptive learning based on performance.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clear descriptions and previews of additional quiz content.
Assumption to check: In-app purchases can be confusing for users.
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
Contains all learning levels — no in-app purchases required! The US History Game For Kids app lets you practice facts about US history that are typically part of the curriculum for kids and students in 6th through 8th grade. This is a fun way to practice history facts in an interactive quiz format and learn a lot about American history. U.S. History Quiz Features: - Correct answers are highlighted if students get answers wrong - The US History questions get progressively harder - Option to adjust level of difficulty - Smart Learning review levels offer practice to make learning really stick - Kids win medals and points for completing educational sections of the quiz - Fully integrated in Game Center with seven educational achievements - Play the first five levels for free up to the Bronze medal - Option to purchase additional levels with new learning questions Practicing the questions on this US History quiz game will not only teach important educational facts, but also make it easier to complete the games on the fun online learning sites Always-Icecream.com and Clever-Dragons.com, where kids earn virtual currency for each level they complete. With this currency, children can unlock fun and creative games.
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 Navigation
Zustand
Expo
React Native Vector Icons
Axios
BUILD KIT DIFFICULTY
Starter
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.
