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.
Tip Simple is a convenient, easy-to-use tip calculator application with a Simple and Custom tipping mode
$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.
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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 Tip Simple: 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 customization options for tip percentages
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No history tracking for past calculations
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lacks multi-currency support
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No dark mode feature
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.
Tip Simple is a convenient, easy-to-use tip calculator application with a Simple and Custom tipping mode. Additionally we've included tipping standards for the United States to help with common questions about tip etiquette. Simple Mode: Use simple mode to handle more common restaurant scenarios where there is a party from 1 - 6 and you'd like to select from a standard set of tip percentages. The key here is speed--just enter your bill amount, tap a few settings and you're done! Custom Mode: When you've got a larger party or would like to fine tune the tip percentage, or provide a tip percentage not available in Simple Mode, Custom is the way to go. Just click the tip percent or number in party and a wheel will appear letting you select a custom percentage or party count. Tipping Standards: We've included information about standard tipping practices for different types of services. The standards information is currently United States only but we are working on information for Europe in the next release. Receipt Capture: Needs to capture your receipts for expense purposes? We've got you covered with our receipt capture feature.
Written user reviews are not shown here. Check current App Store reviews >
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.