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
Sailing Companion
Key Features:
$1.99
PRICE
$1.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 Sailing Companion: 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
Key Features: - GPS Tracking: Continuous recording with background support. Pause and resume any time. - Navigation: Set and edit waypoints and navigate along the route, with sound and voice notifications. - Digital Logbook: Capture position, weather, maneuvers, engine readings, photos and voice notes — all on the timeline of your trip. - Live Cockpit: Customize your own digital cockpit and select from 12 sailing metrics — large, glanceable digits that work in bright sunlight. - Anchor Alarm: Drop a virtual anchor, set a radius, and let the app watch for drift — even when your phone is asleep. Power-saving function in low battery mode. - Export & import your trips for backup and sharing with other Sailing Companion users via an open archive file format (.sca) - also works via AirDrop - Export your trip data as printable PDF logbook or as GPX, CSV or JSON for importation in your favorite map tools and apps (e.g. Google Maps). - Social media content generation: Create stunning trip sharing cards or videos with trip data overlay - for your favorite social channels. - MOB functionality with immediate switch to emergency navigation mode and safety relevant extra. features. - Dark Mode: Switch to Dark Mode to save energy and reduce overheating of displays in bright sunlight. - NEW: Apple Watch support with a subset of above features, optimized for the use on your wrist.
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
Implement offline mode to access essential features without internet.
Assumption to check: Limited offline functionality in sailing apps
Validate with people who use this workflow before building.
Hypothesis 2
Integrate multiple weather APIs for more reliable data.
Assumption to check: Inaccurate weather forecasts
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate user-generated content such as trip logs or reviews.
Assumption to check: Poor user engagement with static content
Validate with people who use this workflow before building.
Hypothesis 4
Simplify navigation with intuitive gestures and clear icons.
Assumption to check: Complicated navigation in map interfaces
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
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Axios
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@react-native-maps
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.
