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
Lineup - Football Squad
Lineup - Football Squad for iOS allows you to create your own Football lineups and save them as images.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
109 ratings · Top 15%
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 Lineup - Football Squad: map the core Sports 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
Implement more intuitive navigation with clear labels and icons.
Assumption to check: Users report difficulty in navigating between screens.
Validate with people who use this workflow before building.
Hypothesis 2
Offer extensive player editing features including stats and abilities.
Assumption to check: Limited player customization options.
Validate with people who use this workflow before building.
Hypothesis 3
Provide clear information and previews of premium features before users encounter paywalls.
Assumption to check: In-app purchases are not clear.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize performance with better data handling and loading states.
Assumption to check: App can be slow with large data sets.
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
Lineup - Football Squad for iOS allows you to create your own Football lineups and save them as images. You can set up five teams by using your players from your own team, professional players or even your favourite ever 11 from your favourite club. - Rearrange the players by dragging the images anywhere on the pitch or to the subs bench below. - Players can be changed by tapping the image and selecting a new player. - Press and hold to select a Captain. - Images for players can be imported from your camera, photos app or from a web search. - When your squad is complete, tap the share button and choose where to save/share the image. - Images can be saved to your photos app, shared via SMS/Email/Facebook etc or opened in another app. I hope you enjoy using Lineup - Football Squad for iOS. Please leave a review. All feedback is welcome and can be sent from within the app. Credits for images in screenshots. Nick Pope - Charltonkyle, CC BY-SA 4.0 , via Wikimedia Commons Dean Henderson - Jrppezza, CC BY-SA 4.0 , via Wikimedia Commons Sam Johnstone - Catherine Kõrtsmik, CC BY 2.0 , via Wikimedia Commons Kyle Walker - Кирилл Венедиктов, CC BY-SA 3.0 GFDL, via Wikimedia Commons Ben Chilwell - Дмитрий Пукалик, CC BY-SA 3.0 GFDL, via Wikimedia Commons John Stones - Chensiyuan, CC BY-SA 4.0 , via Wikimedia Commons Harry Maguire - Кирилл Венедиктов, CC BY-SA 3.0 GFDL, via Wikimedia Commons Kieran Trippier - Oleg Bkhambri (Voltmetro) [CC BY 3.0] Conor Coady - Catherine Kõrtsmik, CC BY 2.0 , via Wikimedia Commons Reece James - James Boyes from UK, CC BY 2.0 , via Wikimedia Commons Eric Dier - Oleg Bkhambri (Voltmetro) [CC BY 3.0] Tyrone Mings - Jon Candy from Cardiff, Wales, CC BY-SA 2.0 , via Wikimedia Commons Luke Shaw - Jon Candy, CC BY-SA 2.0 , via Wikimedia Commons Declan Rice - Steindy (talk) 16:18, 29 August 2019 (UTC), CC BY-SA 4.0 , via Wikimedia Commons Phil Foden - Brad Tutterow, CC BY 2.0 , via Wikimedia Commons Kalvin Phillips - Rccousins, CC BY-SA 4.0 , via Wikimedia Commons Mason Mount - Brian Minkoff London-Pixels, CC BY-SA 4.0 , via Wikimedia Commons Jesse Lingard - Oleg Bkhambri (Voltmetro) [CC BY 3.0] Jude Bellingham - By Struway2, CC BY-SA 4.0 Harry Kane (captain) - Антон Зайцев [CC BY-SA 3.0 GFDL] Raheem Sterling - Антон Зайцев [CC BY-SA 3.0 GFDL] Dominic Calvert-Lewin - Everton Football Club, CC BY 3.0 , via Wikimedia Commons Mary Earps - EL Loko, CC BY 4.0 via Wikimedia Commons Ellie Roebuck - James Boyes from UK, CC BY 2.0 via Wikimedia Commons Alex Greenwood - James Boyes, CC BY 2.0 via Wikimedia Commons Millie Bright - James Boyes from UK, CC BY 2.0 via Wikimedia Commons Rachel Daly - James Boyes from UK, CC BY 2.0 via Wikimedia Commons Lotte Wubben-Moy - Night10591995, CC BY-SA 4.0 via Wikimedia Commons Niamh Charles - Katie Chan, CC BY-SA 4.0 via Wikimedia Commons Gabby George - joshjdss, CC BY 2.0 via Wikimedia Commons Esme Morgan - Katie Chan, CC BY-SA 4.0 via Wikimedia Commons Leah Williamson - James Boyes from UK, CC BY 2.0 via Wikimedia Commons Keira Walsh - EL Loko, CC BY 4.0 via Wikimedia Commons Georgia Stanway- Granada, CC BY-SA 4.0 via Wikimedia Commons Ella Toone - James Boyes from UK, CC BY 2.0 via Wikimedia Commons Katie Zelem - James Boyes from UK, CC BY 2.0 via Wikimedia Commons Nikita Parris - EL Loko, CC BY 4.0 via Wikimedia Commons Chloe Kelly - James Boyes from UK, CC BY 2.0 via Wikimedia Commons Lauren James - James Boyes from UK, CC BY 2.0 via Wikimedia Commons Ebony Salmon - James Boyes from UK, CC BY 2.0 via Wikimedia Commons
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
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.
