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
History for Kids - Vikings
History for Kids - Vikings is the perfect companion for young explorers who love learning about the past
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for History for Kids - Vikings: map the core Travel 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 interactive games and quizzes alongside stories.
Assumption to check: Lack of engaging content for kids
Validate with people who use this workflow before building.
Hypothesis 2
Implement a clearer tab navigation and onboarding tutorial.
Assumption to check: Difficulty in navigation
Validate with people who use this workflow before building.
Hypothesis 3
Add features such as voice narration and video content.
Assumption to check: Limited interactivity
Validate with people who use this workflow before building.
Hypothesis 4
Clearly display premium content and benefits to users.
Assumption to check: In-app purchase confusion
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
History for Kids - Vikings is the perfect companion for young explorers who love learning about the past. Designed for children and their parents, this app brings the fascinating world of the Vikings to life through fun stories, audio narrations, and surprising facts. Explore 9 exciting sections covering the best of Viking history: - Viking Ships: Discover the legendary longships that carried Vikings across oceans. Learn how they were built and why they were the most advanced vessels of their time. - Warriors and Weapons: Step into the world of Viking warriors. Explore their weapons, armor, battle tactics, and the code of honor that guided them. - Norse Gods: Meet Odin, Thor, Freya, and other powerful Norse gods. Explore the myths and legends that shaped Viking culture and beliefs. - Daily Life: Find out what ordinary Vikings ate, wore, and did for fun. Discover how Viking children lived and played in the Norse world. - Exploration and Discovery: Follow the Viking explorers who sailed to Iceland, Greenland, and even North America. Learn about their incredible journeys across unknown seas. - Food and Feasts: Discover Viking recipes, grand feasts, and the surprising foods that Vikings enjoyed every day in their longhouses. - Runes and Writing: Explore the mysterious world of Viking runes. Learn how Vikings used these ancient symbols to write messages and tell stories. - Games and Entertainment: Discover the games, sports, and storytelling traditions that Vikings enjoyed during long winter nights and festive gatherings. - Famous Vikings: Meet legendary figures like Ragnar Lothbrok, Leif Erikson, and other famous Vikings who shaped history with their daring adventures. With 46 illustrated guides and 26 fun "Did you know?" curiosity cards, your kids will learn while having a blast. Every page comes with audio narration so children can listen to the stories being told. Available in 7 languages: English, Spanish, French, Italian, German, Chinese, and Portuguese. Why families love this app: - Works completely offline. No internet needed, ever. - No advertisements of any kind. - No tracking, no analytics, no data collection. - No in-app purchases. - No external links or social media. - Safe for children to use independently. - Beautiful illustrations for every section and page. - Audio narrations bring every story to life. - Fun curiosity cards with surprising facts. - Available in 7 languages with full translations. Download History for Kids - Vikings and turn learning into an unforgettable adventure.
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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.
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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.
