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
TimerCubed
TimerCubed is a modern, customizable speedcubing timer for iOS built to be easy to use and have lots of features
$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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 TimerCubed: 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
Add customizable themes and sound options.
Assumption to check: Users find timer apps lack unique features.
Validate with people who use this workflow before building.
Hypothesis 2
Ensure seamless notification support for alerts.
Assumption to check: Timers often do not integrate well with notifications.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a detailed history view with reusability options.
Assumption to check: Limited history tracking for timers.
Validate with people who use this workflow before building.
Hypothesis 4
Create an engaging onboarding flow with tutorial.
Assumption to check: Poor user onboarding experience.
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
TimerCubed is a modern, customizable speedcubing timer for iOS built to be easy to use and have lots of features. It includes saves, statistics, themes, scrambles, support for external timers through bluetooth and wired, and a customizable timer. ----- Some of our features: • Simple but customizable timer with support for mouse and keyboard on iPad and Mac • Themes and customization with font options, color choices, and background customizability, with support for custom images • Statistics and insights in the app to show your solving progress across sessions • Sessions and backups, with multiple import and export options to keep your solves organized and safe • Support for quality scrambles for 2x2 through 7x7 as well as megaminx, pyraminx, skewb, square-1, clock, and even FTO • Smart timer and typing input support for timing • Apple Watch app with syncing to iPhone • Widgets for Home Screen that can show you stats, quick actions, and your time trend ----- No tracking, and the only purchase you will make is buying the app. For support/feedback, reach out to [email protected]
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
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expo-notifications
expo-router
react-native-gesture-handler
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.
