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
RallyTracks
RallyTracks is a simplified version of the traditional trip computers as used in Rally cars all over the world.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 included15 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 RallyTracks: map the core Navigation 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
Offer downloadable maps for offline access.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their map view and route preferences.
Assumption to check: Lack of user customization options
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social sharing for events and user achievements.
Assumption to check: Inadequate social features
Validate with people who use this workflow before building.
Hypothesis 4
Implement real-time traffic overlay for better route planning.
Assumption to check: No real-time traffic updates
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
RallyTracks is a simplified version of the traditional trip computers as used in Rally cars all over the world. This application is a useful addition when driving a classic or modern vehicle during a rally with a roadbook based on symbols. The distance and average speed counters can be used in kilometers or miles. Main functions: - keep track of the current part of your roadbook. - display totals of the current track. - monitor average speed during a certain period or distance of the track. After completing a track you will be able to view it on a map and send it through e-mail for later use. The created tracklog is a typical gpx-style document. In this application you will not be able to import gpx-files or other types of tracklogs created by others. The application is mainly build to make life easier during an amateur rally with a roadbook and especial for use in cars which lack a speedometer with 100 meter (day)counter. This application has been extensively tested to ensure it meets the regulations for trip computers. Be aware that gps-devices are not allowed in official rally-events. For use on iPhone.
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
axios
react-native-maps
@react-native-community/geolocation
BUILD KIT DIFFICULTY
Intermediate
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.
