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
SmartRace for Carrera Digital
SmartRace Race App for Carrera® Digital
$10.99 · In-app purchases
PRICE
$10.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
156 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.
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'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 SmartRace for Carrera Digital: map the core Entertainment 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 extensive customization features for cars and tracks.
Assumption to check: Limited car and track customization options.
Validate with people who use this workflow before building.
Hypothesis 2
Implement robust connection handling and troubleshooting features.
Assumption to check: Occasional connectivity issues with Carrera Digital tracks.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the purchasing process and provide clear explanations of benefits.
Assumption to check: In-app purchases can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 4
Design a cleaner, more organized UI layout.
Assumption to check: User interface can be cluttered.
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
SmartRace Race App for Carrera® Digital Bring the racing action directly to your living room with the SmartRace Race App for Carrera® Digital! Just connect Carrera® AppConnect® to your track and start SmartRace on your tablet or smartphone. SmartRace features: * Clear racing screen with all the important data for all drivers and cars. * Free practice, qualifying and race mode (time or lap based) available * Database for drivers, cars and tracks with photos and tracking of personal records. * Gathering of extensive statistical data with all driven laps, leader changes and pitstops in races and qualifyings. * Sharing, sending, saving and printing of results (depends on third party apps). * Voice announcements with the driver's name for important events. * Ambient sounds to make the driving experience even more intensive and realistic. * Full support for the fuel feature with exact display of the current amount left in the fuel tank. * Straightforward setup for cars using sliders (speed, brake strength, fuel tank size). * Straightforward assignment for drivers and cars to controllers. * Assignment of individual colors to each controller for easy distinction. * Many configuration options for all segments of the app. * Fast and free support for all questions and issues. SmartRace (aswell as the voice announcements) is entirely available in english, but you can of course switch to one of the supported and included languages any time. These languages are supported at the moment: * English * German * French * Italian * Spanish * Dutch * Polish If you have any questions, are experiencing issues or have new ideas, please head over to https://support.smartrace.de or get in touch with me via [email protected]. SmartRace is constantly refined with new and useful features! ——— In-App Purchases and Subscriptions ——— You may want to subscribe to the SmartRace Champions Club to get immediate access to all available add-ons, available as a subscription from within the app. - 1 month costs €2.49 Should you choose to subscribe to the SmartRace Champions Club, the purchase will be charged to your iTunes account. The subscription will be auto-renewed 24 hours prior to it running out and you can manage it from User Settings in iTunes after purchasing it, and you'll also be able to cancel the auto-renewing subscription from there. Terms and Privacy Policy: https://www.smartrace.de/tos SmartRace is a cooperations partner of the ADAC RAVENOL 24h Nürburgring. Carrera®, Carrera Digital® and Carrera AppConnect® are registered trademarks of Stadlbauer Marketing + Vertrieb GmbH. SmartRace is no official Carrera product and in no way affiliated with or endorsed by Stadlbauer Marketing + Vertrieb GmbH.
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.
