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
Queen Elizabeth II
On 9 September 2015, Elizabeth II, Head of State of the UK and other Commonwealth Realms, surpassed the reign of her great-great-grandmother, Queen Victoria
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 ratings · Top 5%
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 Queen Elizabeth II: map the core Reference 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
Include quizzes or trivia to engage users.
Assumption to check: Limited interactive content compared to similar apps
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate videos or audio clips related to the Queen.
Assumption to check: Lack of multimedia elements
Validate with people who use this workflow before building.
Hypothesis 3
Add options for users to share content on social media.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Offer more diverse premium content to attract users.
Assumption to check: In-app purchase limitations
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
On 9 September 2015, Elizabeth II, Head of State of the UK and other Commonwealth Realms, surpassed the reign of her great-great-grandmother, Queen Victoria. Learn about this most respected of rulers - Her Royal Highness reigned for 70 years and 214 days, with a life of devotion and dignity. The year 2022 saw the Platinum Jubilee celebrations for her reign – the first British monarch to reach this milestone. This app is a tribute to Her Majesty and her life devoted to public service. It contains all sorts of interesting information about her reign. All of the information is stored locally, but there are wiki hyperlinks throughout allowing access to more detailed information. > Learn about the spectacular events that took place in the 2012 Diamond Jubilee celebrations. > Read about the life of Queen Elizabeth. > Find out about other monarchs who have celebrated Jubilees. > Discover what life was like in Britain 70 years ago. > Read about the music charts and food prices when Queen Elizabeth came to the throne. > See which 15 Prime Ministers have served under The Queen during the 70 years. > Study a list of all of the Kings and Queens who went before her. > Read the list of the next 100 people in the line of succession.
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
Expo
Axios
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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.
