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
TVM: Time Value of Money
The TVM: Time Value of Money, Financial Calculator app will help you figure several different calculations using the most efficient financial formulas of Present Value, Future Value, Periodic Payment Amount, Number of...
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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 included15 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 TVM: Time Value of Money: 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
Include advanced features like financial projections and investment analyses.
Assumption to check: Limited functionality beyond basic calculations
Validate with people who use this workflow before building.
Hypothesis 2
Add features to export calculations as PDFs or share via social media.
Assumption to check: No export or share options for results
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize themes or save favorite calculations.
Assumption to check: Lack of user customization
Validate with people who use this workflow before building.
Hypothesis 4
Create a community forum or help center for user support.
Assumption to check: No community or support features
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
The TVM: Time Value of Money, Financial Calculator app will help you figure several different calculations using the most efficient financial formulas of Present Value, Future Value, Periodic Payment Amount, Number of Compounding Periods (months or years), and Interest Rate. The idea of interest earned is that money made available at the present is worth more than the same amount of money in the future due to its potential earning capacity through interest. Provided this money can earn interest, any amount of money is worth more the sooner it is received. This App specifically concentrates on solving for 1) Present Value (PV), 2) Future Value (FV), 3) Periodic Payment Amount (PMT), 4) Number of Compounding Periods (Time), and 5) Interest Rate (Rate(%)) For example, Compound Annual Growth Rate (CAGR) can be computed by selecting “%” and entering 3 numbers: PV, FV, and Time, then selecting Annual. This app has built-in documentation with equations. This app features: • Send your calculations or conversions by social media or email • Universal App (iPhone, iPod Touch, and iPad) • Latest version of iOS is supported • Retina Display graphics • Fast app switching • Automatically Saves Your Inputs • Export to CSV • All iPhone and iPad screens are supported No network connectivity required.
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
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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.
