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.
Compoundee is the best compound interest calculator for the iPhone.
$2.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Compoundee: 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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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
Assumption to check: Users find it difficult to track multiple accounts efficiently.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Transaction categorization can be inaccurate.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: The app lacks detailed analytics and reporting.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Users desire better notifications for important events.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Compoundee is the best compound interest calculator for the iPhone. Solving compound interest, annuity, and time value of money problems is easy with Compoundee! Use this financial calculator for your savings and investments to see how much money you’re going to make, or change variables to figure out what you need to achieve a goal. You don’t have to be a financial whiz to use it, either. You have a financial goal in mind; you know where you want to be in order to retire early. Unfortunately, you’re just not sure if your initial investment is enough to get you there. When you have Compoundee on your iPhone, those types of questions are answered. In no time at all, you’ll have the answer to how much an investment will be worth over a specific period of time, know what the necessary rate would be and the amount to make your periodic deposits in order to reach your time and money goals. You would think that a calculator that handles complex equations like these would be difficult to use but it’s not. The app’s interface is super simple, very user-friendly. No previous exposure to financial calculations is necessary to put Compundee to work for you. Everyone can take advantage of what this application has to offer. Very quickly and easily, you will have your compound interest, annuity, and time value of money (TVOM) equations solved for your savings and investments. Amortized interest totals per period, inflation and tax amounts, it’s all here. You can email your calculations to your accountant, spouse, investment broker – whoever you want. Check out the important features you get when you download Compoundee: • Clean, user-friendly interface • Solve for any of 5 different investment variables • Compound daily, quarterly, annually, & more • Periodic deposits or withdrawals • Inflation and tax adjusted amounts • Amortization shows per period interest • Account for extra annual deposits • Specify deposits at beginning or end of period • History of most recent entries for each input • Send calculations through email • Bookmark saved calculations for easy retrieval • See all your results in itemized detail • Two day-counting options • Offline user guide built right into the app. • Supports extremely large values • Supports long durations (thousands of years) • Doubles as a loan-payment calculator (select deposits tab; enter total as 0) • Passode lock with Touch ID • See results as you type • Optional number pad for input • Native iPad interface That early retirement may be closer than you think. Download Compoundee onto your iPhone now to find out.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.