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
R-navi
R-navi makes cheering at running events easier and more fun!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
1,119 ratings · Top 15%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 R-navi: 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
Implement an intuitive route editor with drag-and-drop functionality.
Assumption to check: Users report difficulty in customizing routes.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance GPS accuracy with better algorithms or integration with wearables.
Assumption to check: Inaccurate GPS tracking during runs.
Validate with people who use this workflow before building.
Hypothesis 3
Add features for sharing runs and achievements with friends.
Assumption to check: Limited social features for sharing runs.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the UI with a more streamlined design focusing on essential features.
Assumption to check: Cluttered interface with too many options.
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
R-navi makes cheering at running events easier and more fun! When your family or friends are running a race, you probably wonder, "Where are they now?" or "When will they pass by?" But waiting by the roadside without knowing can be tough. With R-navi, you can see the runner's predicted location on a map based on official race timing data. You'll know roughly how many minutes it'll take for them to reach your spot –– so you can cheer at just the right moment! Can't make it to the course? No problem! You can send supportive messages or tap the virtual drum to cheer from anywhere. Runners can also enjoy the app by reviewing their race results and sending thank-you messages to their supporters. (If you registered for the race through RUNNET, you'll get access to even more features!) Now supporting around 100 races per year — Join in and make cheering (and being cheered for) more special than ever! Tablet support is not guaranteed.
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-navigation
react-native-maps
Zustand
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.
