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.
What is the best age to start your Social Security benefits? What if you start at 62 with reduced benefits, but invest and get compound interest? Or is it a good idea for you to wait until 70 for increased benefits?
$0.99 · 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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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 Social Security 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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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: Limited user customization options for input fields
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app purchases for basic features can frustrate users
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of visual explanations for calculations
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No social sharing options for results
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.
What is the best age to start your Social Security benefits? What if you start at 62 with reduced benefits, but invest and get compound interest? Or is it a good idea for you to wait until 70 for increased benefits? The Social Security Calculator is a powerful estimating tool that can answer these questions and help you plan for retirement. [ Features ] • Estimates the most profitable starting age for your benefits based on your income and life expectancy • Calculates your potential lifetime net income for all benefit starting ages so you can easily compare the results • Your date of birth and benefit amount at full retirement age are all you need to know (benefits at FRA can be found on your Social Security statement or by creating an account on SSA.gov) • Optionally include other monthly income, an interest rate for income, monthly expenses, and an interest rate for expenses • Optionally disable paying down expenses (potentially useful in situations when compounding income exceeds compounding expenses) • Detailed results are presented in interactive Summary, Spreadsheet, and Graph formats • Calculation inputs can be labeled and saved for quick retrieval and comparison • Robust in-app help via information buttons, getting started guide, glossary, and links to additional resources [ Interactive Results ] • Summary - a table of life expectancy ages with their most profitable starting ages for benefits. Rows can be expanded to show your estimated lifetime net income for every life expectancy age. The lifetime net income rows can be tapped to highlight the corresponding cell in the Spreadsheet. • Spreadsheet - detailed spreadsheet format showing your estimated lifetime net income for all Social Security starting ages and life expectancy ages. Each lifetime net income cell can be tapped to show more detailed information. The differences in lifetime net income amounts can be easily examined for all benefit starting ages. • Graph - calculation results displayed as lines depicting estimated lifetime net income for each Social Security starting age. Clearly illustrates the differences in lifetime net income for all benefit starting ages. Any starting age line can be toggled on or off. Tapping a point on the graph will display more detailed information. Supports zooming to show increased granularity. [ Disclaimer ] We have carefully followed the benefit rules from the Social Security Administration and have tested to ensure that our calculations are as accurate as possible. However, since we are not affiliated with the SSA, this app is only intended to be used for reference. Before making a retirement decision we strongly recommend reviewing SSA.gov and other resources for more information. (The app links to several useful resources in Help > Additional Resources.) Also please be aware that this app currently does not calculate spousal benefits or survivor benefits. If you would like us to add this functionality or have any other ideas to improve the app please let us know. [ Credits ] • App Design / Development - Denton Kollar • Original Concept / Consulting - Paul Cichocki
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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.