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
Five Nights at Freddy's 4
NOTE: Remastered version from the PC version
$2.99 · In-app purchases
OVERALL US RANK
#98
Paid · all categories
REVENUE (Est)
$114K/mo
$62K - $167K
RATING
★ 4.6
11,755 ratings · Top 15%
Evidence scope: #98 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.
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Five Nights at Freddy's 4: 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 procedurally generated levels or endless mode.
Assumption to check: Limited replayability after completing the game.
Validate with people who use this workflow before building.
Hypothesis 2
Implement difficulty settings to cater to different player skills.
Assumption to check: Difficulty spikes can frustrate players.
Validate with people who use this workflow before building.
Hypothesis 3
Offer cosmetic upgrades instead of gameplay advantages.
Assumption to check: In-app purchases can disrupt gameplay flow.
Validate with people who use this workflow before building.
Hypothesis 4
Add a multiplayer mode for cooperative or competitive gameplay.
Assumption to check: Lack of multiplayer options.
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
NOTE: Remastered version from the PC version. A device with at least 2 GB of RAM is required for this game to run properly. In this last chapter of the Five Nights at Freddy's original story, you must once again defend yourself against Freddy Fazbear, Chica, Bonnie, Foxy, and even worse things that lurk in the shadows. Playing as a child whose role is yet unknown, you must safeguard yourself until 6am by watching the doors, as well as warding off unwanted creatures that may venture into your closet or onto the bed behind you. You have only a flashlight to protect yourself. It will scare away things that may be creeping at the far end of the hallways, but be careful, and listen. If something has crept too close, then shining lights in its eyes will be your end. NOTE: Interface and audio in English. Subtitles in English, French, German, Dutch, Spanish (Latin America), Italian, Portuguese (Brazil), Russian, Japanese, Chinese (Simplified), Korean. #MadeWithFusion
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
Supabase
Zustand
react-navigation
expo-av
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.
