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
ProMasters Only
Welcome to the ProMasters Only App version 2.0
$69.99 · In-app purchases
PRICE
$69.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
21 ratings · Top 15%
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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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 ProMasters Only: 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
Provide a wider variety of tools and features.
Assumption to check: Limited tool options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a free tier or trial period.
Assumption to check: High initial cost may deter users.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize tool settings.
Assumption to check: Lack of customization options for tools.
Validate with people who use this workflow before building.
Hypothesis 4
Create a resource hub with tutorials and community forums.
Assumption to check: No community support or tutorials.
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
Welcome to the ProMasters Only App version 2.0. This is a phone or tablet app written specifically for the Ram ProMaster. Covers Promaster 1500, 2500, and 3500 all years. App requires hardware purchase of an OBD dongle ($15-30 on Amazon). Approved dongles and links to them are in the demonstration video: https://youtu.be/XWhNLE6Peno New and Improved for 2.0: * Gauge Alarms * One-touch Login * Wake Lock * Heads Up Display Mode * Gauge explanation videos * Oil Change/Repair log book * Repair Shop Finder * Technical Library of videos covering ALL topics * Fluids and Consumables Specs This app features a trouble code reader, and if any of the common codes for ProMaster come up it provides a link for a detailed explanation of that code, what causes it, and how to fix it. Gauges for Voltage, Oil Pressure, Coolant Temperature, Engine power, and Fuel trims. Plus the ALL IMPORTANT Transmission fluid temperature gauge - monitoring transmission temps may save your transmission! Note: transmission temp gauge does not work on 2022-later vans, but is not as important on those newer transmissions. Note: app not fully implemented for the diesel ProMasters. App is free upgrades for life.
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 Navigation
expo-clipboard
BUILD KIT DIFFICULTY
Advanced
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.
