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
Time Unit Calculator
Introducing the Time Unit Calculator - an intuitive, easy-to-use, and powerful time conversion tool designed to simplify your time calculations and improve productivity.
$0.99 · In-app purchases
PRICE
$0.99
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 included14 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 Time Unit Calculator: map the core Business 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 robust algorithm for precise conversions.
Assumption to check: Users often find time converter apps inaccurate for specific conversions.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to save their favorite conversions.
Assumption to check: Limited customization options for users.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance user experience with clear labels and tooltips.
Assumption to check: Some apps lack intuitive navigation.
Validate with people who use this workflow before building.
Hypothesis 4
Add a history feature to track previous conversions.
Assumption to check: Inability to view conversion history.
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
Introducing the Time Unit Calculator - an intuitive, easy-to-use, and powerful time conversion tool designed to simplify your time calculations and improve productivity. Tired of manually converting hours and minutes to decimal hours? The Time Unit Calculator is here to save the day! With just a few taps, you can effortlessly convert between hours, minutes, and decimal hours, making your time tracking and calculations a breeze. Key Features: Easy and user-friendly interface Convert from hours and minutes to decimal hours Convert from decimal hours to hours and minutes Save time and eliminate calculation errors Perfect for professionals, students, and anyone in need of accurate time conversions Compatible with various time tracking and project management systems Why choose Time Unit Calculator? Our app is designed to help you efficiently manage and track your time, whether you're a freelancer, student, or professional. Its user-friendly interface and straightforward conversion process allow you to focus on what truly matters - your work. With the Decimal Hours Calculator, you can say goodbye to tedious manual calculations and hello to a hassle-free time conversion experience. How does it work? Using the Time Unit Calculator is a piece of cake! Simply enter the hours and minutes you want to convert and let the app do the rest. The result will be displayed in decimal hours format, accurate to the second. Alternatively, you can input decimal hours, and the app will provide you with the corresponding hours and minutes. Who can benefit from Time Unit Calculator? The Time Unit Calculator is a versatile tool that can be used by anyone who needs to convert time units accurately and efficiently. This includes: Freelancers and remote workers tracking billable hours Project managers monitoring project timelines Students managing their study schedules Employees keeping track of their work hours Employers calculating payroll hours And many more! Experience the ultimate convenience of time conversion with the Time Unit Calculator. Download now and simplify your time management tasks like never before!
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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
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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.
