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
Cargo Decoder Plus
Cargo Decoder is your guide to what is in the truck or tanker next to you on the highway
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
6 ratings · Top 30%
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 included17 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 Cargo Decoder Plus: map the core Reference 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
Expand database and allow user submissions for codes.
Assumption to check: Limited cargo code database
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the purchase process and clarify premium features.
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 3
Add features like favorites and history to enhance interaction.
Assumption to check: Minimal user engagement
Validate with people who use this workflow before building.
Hypothesis 4
Optimize backend queries and implement caching.
Assumption to check: Slow loading times for code decoding
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
Cargo Decoder is your guide to what is in the truck or tanker next to you on the highway. Enter the 4 digit number from the DOT placard to learn about a material. See details from both the 2024 Emergency Response Guidebook (ERG 2024) If you need them, ERG 2020, ERG 2016 and ERG 2012 are available too. Powerful search capabilities will help you quickly find information by matching just part of the UN/NA placard number or material name. Protective distance information, toxic inhalation hazards, and ERG2020 reference pages are just a touch away for emergency responders and HazMat personnel. A simple touch quickly gets you to the information you need. Cargo Decoder Plus uses no network bandwidth so information will always be available even if your network is not. - Find safety information on hazardous cargo - Search by name or input DOT number - View ERG2024, ERG2020, ERG2016, or ERG2012 reference pages - Access directly on device, no network connection required - Share information with friends and colleagues - Learn about the Globally Harmonized System of Classification and Labeling of Chemicals (GHS)
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
TypeScript
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.
