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 Value Calculator
Stop wondering if you can afford it – see what it REALLY costs in hours of work!
$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 included14 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 Time Value Calculator: map the core Finance 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
Introduce gamified features like achievement badges for frequent calculations.
Assumption to check: Limited user engagement due to lack of gamification.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set default rates and save frequently used calculations.
Assumption to check: No customization options for financial calculations.
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate graphs or charts to visualize financial trends.
Assumption to check: Absence of visual representation of calculations.
Validate with people who use this workflow before building.
Hypothesis 4
Add tutorials or tips on financial concepts related to time value of money.
Assumption to check: Lack of educational content for users unfamiliar with finance.
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
Stop wondering if you can afford it – see what it REALLY costs in hours of work! Time Value Calculator transforms the way you think about spending. Instead of just seeing price tags, instantly discover how many hours you need to work to afford any purchase. Why You'll Love It: - Know Your Real Costs – See purchases in hours and minutes, not just dollars - Lightning Fast – Type a price, get instant results - Family Profiles – Track separate rates for multiple income earners - After-Tax Calculator – Find your true take-home hourly rate from your paycheck - Smart Breakdown – View costs as work hours, days, and percentage of daily wages - Auto-Save – Your rates are saved automatically Perfect For: - Making smarter shopping decisions - Couples managing household budgets together - Anyone wanting to understand the true cost of purchases - Teaching financial awareness to teens and young adults Transform "Can I afford this?" into "Is this worth X hours of my life?" Download now and start making money decisions with clarity!
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.
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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.
