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
RV Tow Check
The RV Tow Check app is the first "Before You Buy an RV" towing capacity calculator that conforms to manufacturers' weight safety and warranty warnings.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.0
36 ratings · Below Average
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 included16 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 RV Tow Check: map the core Utilities 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
Add more towing-related calculations and features.
Assumption to check: Limited functionality and features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Focus on a more modern and user-friendly design.
Assumption to check: Poor user interface and design
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate user feedback options and support channels.
Assumption to check: Lack of user support and feedback options
Validate with people who use this workflow before building.
Hypothesis 4
Enable sharing of results via social media or messaging apps.
Assumption to check: No sharing options for results
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 RV Tow Check app is the first "Before You Buy an RV" towing capacity calculator that conforms to manufacturers' weight safety and warranty warnings. With 100% accuracy, RV Tow Check answers the most often asked questions, "How much can my truck tow?" or "How much can my SUV tow?" or "How much can my motor coach tow?" However, the accuracy of one's input is not guaranteed. RV Tow Check uniquely complies with the SAE J2807 trailer weight rating (TWR) calculation methodology. RV Tow Check requires four weight inputs from the tow vehicle. The required entries are gross combination weight rating (GCWR), gross vehicle weight rating (GVWR), gross vehicle weight (GVW), and trailer weight ratings (TWR). RV Tow Check provides instant max towing capacity results as the user selects various kingpin or tongue weight percentages. RV Tow Check simplifies the process of obtaining the realistic vehicle towing capacity (RVTC) for any vehicle towing a trailer. The app's math calculations are as accurate as the weights entered into it. RV Tow Check displays realistic vehicle towing capacity for a fifth wheel, gooseneck, and conventional trailers (bumper pull) simultaneously. RV Tow Check users have the option to select a fifth wheel hitch if it is not already installed in the truck. RV Tow Check users may include any additional unscaled weight for cargo, aftermarket equipment, and passenger weight. The app does not assume everyone weighs 150 or 175 pounds as the manufacturers do. RV Tow Check can assist RV buyers and dealers in ensuring tow vehicles are appropriately matched to any type of trailer towed. RV Tow Check provides users with the choice of beginner or expert mode of operation. The app's initial mode is Beginner. Beginner mode has detailed step-by-step instructions. Once the user has learned the correct use, they may switch to "Expert Mode." Expert users will view a streamlined single-page calculator without the instructions. RV Tow Check is a must-have tool for anyone owning or considering a tow vehicle less than a late-model one-ton dually truck. RV Tow Check is a small price to pay, considering it can save one from a very costly mistake.
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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
@react-native-async-storage/async-storage
Styled Components
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.
