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
Tactical Sailing Tips 2.0
Sailing on the go – Tactical Sailing Tips
$2.99 · In-app purchases
PRICE
$2.99
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 included15 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 Tactical Sailing Tips 2.0: 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
Integrate community features for user interaction.
Assumption to check: Lack of user engagement features like comments or forums.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a content management system for regular updates.
Assumption to check: Limited content updates may lead to stagnation.
Validate with people who use this workflow before building.
Hypothesis 3
Design an engaging onboarding experience with tutorials.
Assumption to check: Inadequate onboarding process for new users.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to download content for offline reading.
Assumption to check: No offline access to tips or articles.
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
Sailing on the go – Tactical Sailing Tips Whether a rookie or a professional sailor, everyone interested in the sport of sailing can find a selection of the most important tips needed to steer your boat the "Right of Way", to take the wind from the best side and to also make use of tactical maneuvers while racing against other opponents. The main purpose of this app is to visualize the paths sailed in 16 tips overall as animated video clips for following advanced racing tactical situations: - speed of boats, - position of sails, as well as direction and strength of wind, - for tactical maneuvers against the wind, - basic Right of Way Rules (ISAF / World Sailing). All animations are presented as video clips, comments can be printed out (pdf) as an extension to the tips and their simulated scenes, which you should watch on your iPhone or iPad. After downloading you can use the tips without internet access to take with you on your yacht. In 2012 these tips were awarded winner of the "European Award for Technology Supported Learning - Best Media Didactics!“ iPhone and iPad: This App, however, is only the first step into the world of sailing. Designed for iPad, it will also display on iPhone, but of course in smaller sizes of videos. The first three tips are with sound, the others are without sound, it is because of memory allocation restrictions (150 MB). Therefore the text is a useful extension for iPhone because of its small font size, print and read the comments in a .pdf file. The video clips are sized to be presented on Apple TV. These tips - and further 40 tips - are part of a game: "Tactical Sailing - A Game Against the Wind" and “Boat Against Boat” and "Coach´s Toolbox". If you want to have fun with a powerful Tactic and Strategy game, see a demo for free and order it on our website: www.Tacticalsailing.com - runs on Mac and PC. Keep in touch with other Tactical Sailors Lounge and coaches, see the race board, news and Info online. © Photo front page: Fried Elliott.
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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
React Navigation
Axios
React Query
Shadcn/UI
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.
