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
INDYCAR
The INDYCAR App is your official source for the pulse-pounding excitement of the NTT INDYCAR SERIES and INDY NXT by Firestone — right at your fingertips.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
3,934 ratings · Top 30%
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
Make this idea yours
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 included18 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 INDYCAR: 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 optimized data fetching and caching.
Assumption to check: Slow loading times for live updates.
Validate with people who use this workflow before building.
Hypothesis 2
Add user preferences for notifications and content.
Assumption to check: Limited personalization options for users.
Validate with people who use this workflow before building.
Hypothesis 3
Offer an ad-free premium subscription tier.
Assumption to check: In-app ads disrupt user experience.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify onboarding and improve navigation flow.
Assumption to check: Difficult navigation for new users.
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
The INDYCAR App is your official source for the pulse-pounding excitement of the NTT INDYCAR SERIES and INDY NXT by Firestone — right at your fingertips. Powered by NTT DATA, the INDYCAR App puts you behind the wheel, keeping you connected to your favorite drivers and teams. Never miss a lap with the latest news, schedule, championship standings, video highlights, flag-to-flag coverage and more — all for free. Key Features: • Select your favorite drivers and teams with one touch • Real-time leaderboard with an interactive, full-field track map and live car telemetry • Live onboard camera streaming for select drivers • NEW FOR 2026: Never miss a moment with 'Up to Speed' — real-time on-track updates delivering every key moment to keep you caught up throughout the race • Live driver and pit crew radio transmissions • Follow the stars of tomorrow with full INDY NXT by Firestone driver and team coverage • INDYCAR Radio powered by OnlyBulls audio streaming during each race weekend • Play the INDYCAR Fantasy Challenge driven by Firestone, the official fantasy game of the NTT INDYCAR SERIES • Browse the latest gear from the Official INDYCAR Shop • Set push notifications for breaking news and key INDYCAR updates Features and content within the INDYCAR App are subject to change. © 2026 Penske Entertainment Corp
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.
