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
Vertex: Cube Trainer
A modern cube timer that helps you train all aspects of your solves
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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/
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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 Vertex: Cube Trainer: 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
Implement a detailed analytics page to visualize progress.
Assumption to check: Users find it challenging to track progress over time.
Validate with people who use this workflow before building.
Hypothesis 2
Add more settings for timers and sessions.
Assumption to check: Limited customization options for practice settings.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social sharing features to compare scores.
Assumption to check: Difficulty in sharing results with friends.
Validate with people who use this workflow before building.
Hypothesis 4
Provide a clear value proposition for premium features.
Assumption to check: In-app purchases may feel unclear or unnecessary.
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
A modern cube timer that helps you train all aspects of your solves. Don't just track your times, train your mind to solve even faster. "Vertex: Cube Trainer" makes it easy to train on-the-go, with or without your cube. Take your cubing to the next level. Universal purchase means buy once and use across iPhone, iPad, and MacOS. Includes: F2L, OLL, PLL, COLL, ZBLL aglorithm sets. Last-layer recognition trainer with spaced repetition system and quiz functionality. Flash cards to train algorithm recall. Cross and xcross solutions within your selected number of moves with hints for pair and first-move. Simulate competition with inspection mode that announces at 12 and 8 seconds. Bluetooth Support: Supports Particula GoCube Edge bluetooth cubes. Keeps track of all OLL/ZBLL/PLL cases with recognition and execution time, so you can track which need most improvement. Shows you F2L stats including pause time per F2L pair. Automatically starts and stops the timer, and validates your scrambles. Works for iPhone, iPad, and macOS so that you can train on your preferred device. CloudKit integration stores your session across all of your synced devices.
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
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.
