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
Friday Night Funkin' Mobile
Want to spend some time with your Girlfriend? Too bad, your rhythmic skills are being challenged by just about every nasty goon on planet earth
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
68,293 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 included17 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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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 Friday Night Funkin' Mobile: 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
Regularly add new songs and user-generated content.
Assumption to check: Limited song selection and updates
Validate with people who use this workflow before building.
Hypothesis 2
Implement adjustable difficulty settings for new players.
Assumption to check: High difficulty levels can frustrate new players
Validate with people who use this workflow before building.
Hypothesis 3
Offer cosmetic items instead of pay-to-win options.
Assumption to check: In-app purchases can feel intrusive
Validate with people who use this workflow before building.
Hypothesis 4
Optimize game performance for lower-end hardware.
Assumption to check: Occasional performance issues on older devices
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
Want to spend some time with your Girlfriend? Too bad, your rhythmic skills are being challenged by just about every nasty goon on planet earth. So you'll need to flex your skills and hit notes in time with the music, or the only place you'll be spending your friday is the hospital. DADDY DON'T PLAY NICE In this story you play as BOYFRIEND who's trying to spend some time with no other than GIRLFRIEND. Bummer her evil, twisted freak of a father would sooner put you to rest than ever allow it. And it's not just him, go through the story and meet the many disturbed and backwards dopes who'd try to stand in your way. BANGIN' SOUNDTRACK Enjoy the music that's made waves online, and learn it to a T as you put your rhythm to the test hitting notes in time. Largely composed by KawaiSprite and Saruky, with industry talent collaborations like Lotus Juice of 'Persona 3' fame and Kohta Takahashi of 'Ridge Racer 4' fame. With over 60+ original songs currently in the game, there's plenty to master. INTERACTIVE CARTOON EXCELLENCE Hand drawn, lovingly made 2D visuals. Every stage unique, every enemy special, and made right in Adobe Flash. The art and animations of PhantomArcade bring the Newgrounds spirit to phones in full force. And with more levels, cutscenes, and playable characters on the way... the amount of eye candy The Funkin Crew will bring has no end in sight. The internet classic with 200+ million players is finally here on the App Store, in its best form yet Other features include + Gameplay overseen by Tom Fulp + Code by Ninjamuffin99 + Sky Mod (wait thats not in this) + JohnnyUtah voice acting + Hot(?) characters! + 18 years worth of gameplay
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
react-navigation
@react-native-async-storage/async-storage
redux
BUILD KIT DIFFICULTY
Advanced
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.
