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
2026 TCS London Marathon
The TCS London Marathon App is your ultimate companion for the 2026 TCS London Marathon on Sunday 26 April
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 2.1
8 ratings · Below Average
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 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 2026 TCS London Marathon: 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
Introduce social sharing features and community forums.
Assumption to check: Limited features for user engagement and interaction
Validate with people who use this workflow before building.
Hypothesis 2
Focus on optimizing performance and improving stability.
Assumption to check: Inconsistent performance and crashes
Validate with people who use this workflow before building.
Hypothesis 3
Gather user feedback to iterate on the UI/UX and address pain points.
Assumption to check: Poor user reviews indicating dissatisfaction
Validate with people who use this workflow before building.
Hypothesis 4
Enhance runner tracking with real-time updates and notifications.
Assumption to check: Minimal information on runner tracking
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 TCS London Marathon App is your ultimate companion for the 2026 TCS London Marathon on Sunday 26 April. Download it now to explore all its features and get marathon‑day ready. For Supporters Track runners live progress along the route View recommended cheer points, including estimated arrival times Send a TCS Marathon Boost message to appear on big screens Follow the live Leaderboard and full Results For Participants Get yourself Start Line ready with the handy Marathon Checklist Retrieve your Event Pass, including your QR code for pack collection Plan your visit to the Running Show Invite friends and family to track your progress Access Finisher items such as your Certificate and virtual Medal …and much more. Make the most of your marathon experience - download the TCS London Marathon App and get ready for an unforgettable day.
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
Supabase
react-native-paper
expo-router
Zustand
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.
