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
Mechanical Test Trainer
Preparing for a Mechanical Aptitude Test or simply wish to set your mechanical understanding and knowledge to the test? Either way, this app is for you!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.4
20 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
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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 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 Mechanical Test Trainer: 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
Enhance quiz library with user-generated content.
Assumption to check: Limited quiz variety compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify subscription tiers and provide clearer information.
Assumption to check: In-app purchases can be confusing.
Validate with people who use this workflow before building.
Hypothesis 3
Revamp UI with modern design trends and better navigation.
Assumption to check: User interface feels outdated.
Validate with people who use this workflow before building.
Hypothesis 4
Add comprehensive progress tracking with insights and suggestions.
Assumption to check: Lacks detailed performance analytics.
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
Preparing for a Mechanical Aptitude Test or simply wish to set your mechanical understanding and knowledge to the test? Either way, this app is for you! Preparation can be the difference between passing and failing your aptitude test. Give yourself the best preparation possible with the Mechanical Test Trainer. Practice more than 300 questions divided into 4 categories. After each practice session your results with score are displayed, you can review questions and read a detailed explanation of almost every answer. Your results are stored so that you can follow the progress of your training. YOU choose how to prepare: 1: Select practice or test mode 2: Choose one or more categories to train 3: Select the number of questions 4: Start your preparation! Features: - Detailed explanation of the correct answer - 284 different questions - Customized tests - Score progression chart - Answer statistics - Two modes of training - Compare with previous test-takers. - Retake or review all your previous tests. - Advanced algorithm allows for randomized questions and avoids the repetition of questions Categories: - Mechanical Comprehension - Mechanical Knowledge - Electrical Knowledge - Mechanical Tools
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/vector-icons
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.
