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
Rally: Voice Notes on Race Day
Rally: Voice Notes on Race Day
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
955 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 included16 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 Rally: Voice Notes on Race Day: map the core Health & Fitness 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
Include features for trimming and enhancing voice notes.
Assumption to check: Limited editing options for voice notes
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing options for users to share their notes easily.
Assumption to check: No social sharing capabilities
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize how race data is displayed and sorted.
Assumption to check: Lack of customization for race statistics display
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with popular health and fitness apps for a more comprehensive user experience.
Assumption to check: No integration with fitness tracking apps
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
Rally: Voice Notes on Race Day Get personalized voice notes from friends and family that play automatically at every mile during your race! WORKS FOR ALL DISTANCES: • Marathons (26.2 miles) • Half marathons (13.1 miles) • 10K races (6.2 miles) • Any race with mile markers HOW IT WORKS: • Join your upcoming race in the Rally app • Share your unique race link with supporters • Friends record voice notes for specific mile markers via web browser • Hear their messages automatically as you pass each mile during your race KEY FEATURES: • GPS-triggered voice note playback at mile markers • Works with races worldwide • No app required for supporters - simple web recording • Background audio with automatic music ducking • Secure voice message storage and playback • Real-time location tracking during races PERFECT FOR: Any runner who wants to stay motivated and connected with their support network throughout their entire race journey. Turn every mile marker into a moment of encouragement from the people who matter most. Download Rally and never run alone again.
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
zustand
expo-av
react-navigation
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.
