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 Knots
22 OF THE MOST POPULAR ANDS USEFUL SAILING KNOTS!
$0.99 · In-app purchases
PRICE
$0.99
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's included14 files
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 Knots: 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
Include animated knot tying tutorials.
Assumption to check: Limited interactivity with knots
Validate with people who use this workflow before building.
Hypothesis 2
Add sharing and community features for users.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline knot access and saving.
Assumption to check: No offline access
Validate with people who use this workflow before building.
Hypothesis 4
Enhance design with modern aesthetics and user-friendly navigation.
Assumption to check: Basic UI/UX design
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
22 OF THE MOST POPULAR ANDS USEFUL SAILING KNOTS! • #1 Sports app in 2 Countries! • Top 5 Sports app in 11 Countries! ******* Sailing Knots provides easy-to-follow, step-by-step instructions for tying 22 of the most popular and useful sailing knots. The precisely designed and detailed graphics emphasize key steps and clearly show critical overlapping elements, arrows and other guides to help you tie tricky knots. Follow along with the written steps or rotate your phone to the side for a zoomed view. • Sailing Knots includes these great knots and a visual glossary Bends ▸ Anchor Bend ▸ Carrick Bend ▸ Double Fisherman's ▸ Sheet Bend ▸ Square Knot Hitches ▸ Buntline ▸ Cleat Hitch ▸ Clinch Knot ▸ Constrictor Knot ▸ Rolling Hitch ▸ Round Turn Cleat Hitch ▸ Round Turn Two Half Hitch ▸ Tautline Hitch ▸ Trucker's Hitch Tie a Loop in the Line ▸ Bowline Knot ▸ Butterfly Knot ▸ Double Loop Bowline ▸ Slipknot Quick Release ▸ Slipped Buntline ▸ Mooring Hitch Stoppers ▸ Figure Eight ▸ Heaving Line • SUPPORT: fissionmedia.com
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
react-native-share
expo-router
BUILD KIT DIFFICULTY
Starter
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.
