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
Compound Annual Growth Rate
The Compound Annual Growth Rate Calculator is a powerful and user-friendly iOS app designed to help you visualize the growth of your investments over time
$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 included13 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 Compound Annual Growth Rate: 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 educational tooltips and links to resources.
Assumption to check: Lack of detailed explanations on CAGR
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more robust history feature with sorting and filtering.
Assumption to check: Limited user history tracking
Validate with people who use this workflow before building.
Hypothesis 3
Add graphs to visualize CAGR trends over time.
Assumption to check: No visual representations of growth
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to input multiple investments and compare CAGR.
Assumption to check: May not handle complex scenarios
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 Compound Annual Growth Rate Calculator is a powerful and user-friendly iOS app designed to help you visualize the growth of your investments over time. Whether you're planning for retirement, saving for a big purchase, or simply curious about how your money can grow, this app provides an intuitive way to calculate and track your investment progress. Enter your initial investment, annual contributions, growth rate (CAGR), and number of years to see how your investment grows. View the growth of your investment year by year in a simple graph. See the total value of your investment after the specified number of years, displayed prominently for easy reference. This app is perfect for: Investors: Plan and track your long-term investments. Financial Planners: Quickly calculate and demonstrate growth scenarios for clients. Students: Learn about compound growth and how investments work. Anyone Curious About Savings: See how small contributions can grow into significant savings over time. The app does not contain ads and does not use/store any personal information. The app is not specific to investments. It can be used to calculate growth rates for anything over time. For example, population growth.
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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Expo
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Victory Native
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.
