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
Box Box Club: Formula Widgets
Join 3M+ Racing Fans With The Best F1® Widgets & App
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
3,231 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.
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 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 Box Box Club: Formula Widgets: 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
Provide more detailed customization features and previews.
Assumption to check: Limited widget customization options
Validate with people who use this workflow before building.
Hypothesis 2
Implement real-time news updates for better user engagement.
Assumption to check: Inconsistent news updates
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI by categorizing widgets and improving filtering.
Assumption to check: Cluttered interface with too many widgets
Validate with people who use this workflow before building.
Hypothesis 4
Offer more free features or a trial period to attract users.
Assumption to check: Paywall blocks important features
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
Join 3M+ Racing Fans With The Best F1® Widgets & App We’ve got Lock Screen & Home Screen widgets for live F1 race updates, race schedules, and in-depth stats. Box Box is the most trusted app for Formula 1, F2, F3, and F1 Academy fans worldwide! Our stand-out app features: → Personalised Widgets and Notifications → ‘Head to Head’- select and compare drivers’ season and career stats → Race Weekend schedule and weather updates (in your local time) → Track driver and constructor championship standings → In-depth circuit and driver stats → Breaking motorsport news, education, glossary, and facts Our specialised widgets (Home Screen, Lock Screen, Apple Watch): → Live activity- F1 race updates and standings in real time → Race Schedule- dates, time, countdown, season progress → WDC/WCC standings → Favourite team & driver- points & position → Driver and team badges, photo widget Widgets available in small, medium, & large sizes Dark, Light, Clear and Tinted Modes supported for iPhones & iPads Available in 175+ countries with multilingual support in: Spanish | Italian | French | German | Dutch | Portuguese | Arabic | Russian | Chinese | Japanese | Korean | Turkish | Hungarian | Czech Download Box Box now and bring the thrill of F1 to your fingertips! ------------ *Box Box Club app is unofficial and is not associated in any way with Formula One companies, any specific Formula 1 team, or any Formula 1 driver. F1, FORMULA ONE, FORMULA 1, FIA FORMULA ONE WORLD CHAMPIONSHIP, GRAND PRIX and related marks are trade marks of Formula One Licensing B.V. All assets used, including logos, images, and other copyrighted materials, are owned by the respective teams, drivers, and other entities. Box Box Club is an independent entity and does not claim to have any official relationship or partnership with Formula One companies, any specific Formula 1 team (McLaren, Mercedes AMG Petronas, Scuderia Ferrari, Williams, Alpine, Red Bull, VCARB, Stake, Kick, Aston Martin, Haas), or any Formula 1 driver (Lewis Hamilton, Max Verstappen, Charles Leclerc, Lando Norris, Carlos Sainz, Fernando Alonso, Sebastian Vettel, George Russell, Sergio Perez, Daniel Ricciardo). Any references to Formula One, F1®, FORMULA ONE, FORMULA 1, FIA FORMULA ONE WORLD CHAMPIONSHIP, GRAND PRIX, or related marks are made solely for editorial purposes and do not imply any endorsement, sponsorship, or affiliation by Formula One companies, any specific Formula 1 team, or any Formula 1 driver. For details on our Privacy Policy and Terms of Use, please visit: - https://boxbox.club/Privacy.html - https://boxbox.club/Terms.html
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
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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.
