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
DragTimes.com
The DragTimes application for iPhone, iPod, and iPad - The density altitude calculator will obtain the current weather data for your location and calculate the DA for you instantly
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.4
5 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.
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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 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 DragTimes.com: 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
Add more detailed performance metrics and insights.
Assumption to check: Limited functionality for advanced analytics
Validate with people who use this workflow before building.
Hypothesis 2
Focus on improving the user interface and onboarding experience.
Assumption to check: Poor user reviews indicate usability issues
Validate with people who use this workflow before building.
Hypothesis 3
Implement social sharing and leaderboards to engage users.
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 4
Create a more guided and consistent form for entering times.
Assumption to check: Inconsistent data entry process
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 DragTimes application for iPhone, iPod, and iPad - The density altitude calculator will obtain the current weather data for your location and calculate the DA for you instantly. You can also browse through the DragTimes.com data quickly and easily to compare you cars against others from around the world. Whether you are in the stands or at the tree, the DragTimes.com application is the ideal for anyone that spends time at the track. The DragTimes.com application for iPhone and iPod Touch includes: - 1/8 Mile to 1/4 Mile Time Calculator - 1/8 Mile to 1/4 Mile Speed Calculator - Rear Wheel Horsepower (RWHP) Calculator - RPM Calculator - 1/4 Mile Time Calculator (based on Vehicle Weight and Horsepower) - 1/4 Mile Speed Calculator (based on Vehicle Weight and Horsepower) - Miles Per Gallon (MPG) Calculator - Cubic Inch Displacement (CID) Calculator - Density Altitude Calculator - Injector Maximum Horsepower Calculator - Altitude in Feet and Meters, based on actual device location - Local Weather information based on actual device location, including Current Weather Conditions (includes Temperature, Conditions, Heat Index, Humidity, Dew Point, Wind Speed and Direction, Wind Gusts, Barometric Pressure and much more!), Local and Regional Radar, Extended Forecast and Warnings - About the application information and link to the support website Specifically designed for the Apple iPhone and iPod Touch, the DragTimes application for iPhone and iPod Touch is an easy-to-use and fully functional application that provides the most common calculators used by Drag Racer's, plus real time local weather information based on the actual location of your iPhone or iPod touch. We're constantly working to improve the DragTimes application for iPhone and iPod Touch and User Feedback is a key driver for what we do. Feel free to send your feedback and suggestions to and help us make this application better for you!
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
react-navigation
react-native-chart-kit
formik
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.
