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
ReverseMyTrailer
ReverseMyTrailer is a driving simulator program designed to help you learn how to reverse-manoeuvre any kind of towed trailer (eg caravan, boat trailer, horse trailer etc).
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.6
9 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 included17 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 ReverseMyTrailer: map the core Education 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 the content library with diverse scenarios.
Assumption to check: Limited tutorial variety leading to user disengagement
Validate with people who use this workflow before building.
Hypothesis 2
Ensure high-quality video production and editing.
Assumption to check: Inconsistent video quality affecting learning
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more detailed progress tracking and rewards system.
Assumption to check: Poor user feedback on progress tracking
Validate with people who use this workflow before building.
Hypothesis 4
Introduce forums or chat features for user collaboration.
Assumption to check: Lack of community interaction or support
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
ReverseMyTrailer is a driving simulator program designed to help you learn how to reverse-manoeuvre any kind of towed trailer (eg caravan, boat trailer, horse trailer etc). The simulator gives you a bird's-eye view, along with multiple rear mirror views of the reversing operation. It has an 'autopilot mode' that will demonstrate how to reverse into areas such as gateways and parking spaces and a 'guidance mode' to help you try it for yourself. You can select from a range of towing vehicles and trailers, each of which have different turning characteristics. A range of scenes are available which offer different manoeuvres, including a caravan site, a stable yard and the B+E reversing test. There is also a recording feature that provides an analysis of how well you completed each manoeuvre. If you're feeling competitive, you can even compare your scores to others online!
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-video
zustand
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.
