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
Game Dev Tycoon
"It’s the perfect sort of game for mobile devices and there’s so much to do here [...]" -
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
23,901 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included19 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 Game Dev Tycoon: 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 more complex gameplay elements and deeper resource management.
Assumption to check: Limited game mechanics and depth compared to modern games
Validate with people who use this workflow before building.
Hypothesis 2
Add variety in projects and challenges to keep gameplay fresh.
Assumption to check: Repetitive gameplay can lead to boredom
Validate with people who use this workflow before building.
Hypothesis 3
Implement online leaderboards and cooperative gameplay.
Assumption to check: No social or multiplayer features
Validate with people who use this workflow before building.
Hypothesis 4
Offer cosmetic upgrades or optional content without affecting core gameplay.
Assumption to check: In-app purchases can feel intrusive
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 perfect sort of game for mobile devices and there’s so much to do here [...]" - 5/5 - Toucharcade Game Dev Tycoon is a casual business simulation game where your success depends on your creativity and willingness to experiment. The game does *not* contain any in-app purchases or ads. Slip into the role of a game developer: start your own company, design your own games and make your way to the top to become a Game Dev Tycoon. - Start your own game development company in the 80s - Replay gaming history - Design and create your own games - Hold your breath and wait for reviews to come in - Research new technologies - Hire and manage a world-leading development team - Become the leader of the market - Gain worldwide fans Game Dev Tycoon for iPhone and iPad introduces: - An updated story line - New topics to enable even more varied games - A challenging (but optional) ‘pirate mode’ - Built-in screen recording and streaming support Game Dev Tycoon does not require an internet connection so go ahead and build your gaming empire in Airplane Mode.
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.
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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.
