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
TRACX - The Event App
TRACX is the ultimate event app for athletes who push their limits at the world’s largest sports events
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.8
759 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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Combine features and design from your favorite apps.
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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 included
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 TRACX - The Event App: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
TRACX is the ultimate event app for athletes who push their limits at the world’s largest sports events. The app provides an overview of all the events we support worldwide. Athletes can easily find sports events, while fans can follow any athlete, anywhere, live. Ready? Set. Go! Key features for athletes: - View all event information; - Receive the latest event updates; - Share your live location with friends and family during the event; - Check your performance on the leaderboards and compare your results with other athletes; - Share your results and finish-selfie with others. Key features for fans: - Follow your friends, family, or other athletes during live events; - Receive the latest event updates; - Activate notifications to receive the latest updates from your favorite athlete. Other features: - Don’t miss anything with the LiveTracking feature. See exactly where your favourite athlete is, how many kilometers they have covered, how many kilometers remain, and what position they hold on the leaderboard; - Create your own profile, which can be used for every TRACX event. Compare your results across different events and build your fanbase; - Your timeline informs you of the latest developments surrounding your events. Discover which athletes you can follow, view countdowns of your upcoming events, and receive updates about your favourite athletes; - Discover the event races and routes. TRACX integrates with all timing systems, including MYLAPS, ChronoTrack, and RaceResults. We work with the best timers to provide the most accurate timing during events, so that we can give athletes and fans the best possible event experience.
Written user reviews are not shown here. Check current App Store reviews >
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
Incorporate chat or messaging features for attendees.
Assumption to check: Limited social interaction features among users
Validate with people who use this workflow before building.
Hypothesis 2
Enhance the search and filter options for better event discovery.
Assumption to check: Difficulty in discovering new events
Validate with people who use this workflow before building.
Hypothesis 3
Implement an algorithm to suggest events based on user preferences.
Assumption to check: Lack of personalized event recommendations
Validate with people who use this workflow before building.
Hypothesis 4
Add notifications and updates for changes to events.
Assumption to check: Poor handling of event updates or cancellations
Validate with people who use this workflow before building.
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-native-reanimated
expo-router
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
