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
DF95 & DF65 Sailboat Tuner
The Ultimate DF95 and DF65 Tuning Diary
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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 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 DF95 & DF65 Sailboat Tuner: 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
Allow users to save custom tuning profiles.
Assumption to check: Limited customization options for tuning preferences.
Validate with people who use this workflow before building.
Hypothesis 2
Implement sharing capabilities for tuning settings.
Assumption to check: Lack of community features or user sharing.
Validate with people who use this workflow before building.
Hypothesis 3
Add live tracking of performance metrics during tuning.
Assumption to check: No real-time performance tracking.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a freemium model or trial period for new users.
Assumption to check: High price point for an app with basic features.
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
The Ultimate DF95 and DF65 Tuning Diary Stop relying on memory or messy paper notes. The tuning Tool is a precision logbook designed specifically for the DF95 and DF65 restricted classes. Whether you are tuning for light-air A-Rig conditions or survival B/C-Rig breezes, this app helps you replicate your "fastest" boat setup every time. Key Features: Rig-Specific Logging: Store separate data for A, B, C, and D rigs. Precision Tuning: Record Mast Rake, Forestay Tension, Backstay settings, and Sheet Bowsie positions. Sail Trim Notes: Log your foot depth, twist, and slot measurements. Condition Tracking: Save settings alongside wind speed (knots), water state, and location. Fast Reference: Quickly pull up your "Gold Medal" settings when the wind shifts 10 minutes before the start. Compare your sessions to identify trends and opportunities for improvement Built by a DF95 skipper for the global racing community. No more guessing—just faster sailing.
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
Firebase
TypeScript
react-navigation
react-native-paper
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.
