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
Go Tip – Simple Tip Calculator
Trusted for 10+ years, now better than ever.
$0.29 · In-app purchases
PRICE
$0.29
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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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.
What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Go Tip – Simple Tip Calculator: map the core Food & Drink 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
Add features like custom tip percentages and rounding options.
Assumption to check: Limited functionality compared to full-featured apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement user accounts to save history and preferences.
Assumption to check: No user accounts or history tracking
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI/UX with animations and better visual design.
Assumption to check: Basic UI lacking polish
Validate with people who use this workflow before building.
Hypothesis 4
Add onboarding screens to guide new users.
Assumption to check: No in-app help or tutorial
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
Trusted for 10+ years, now better than ever. Go Tip is here to simplify your tipping experience with its sleek design and user-friendly interface. Key Features: Customizable Color Themes: Express yourself with Go Tip! Choose from a few vibrant color themes to match your mood or style, including a new Valentine theme. Whether you're feeling bold with a neon green or calm with a pale green, Go Tip has the perfect color for you. And more will come! I'm even open to suggestions. Save Your Favorite Settings and recall them using the Tip module feature! Adjustable Decimal Places: Precision matters, and we get it. Customize the number of decimal places for currency to fit your preference. Whether you live in the U.S., or Kuwait, Go Tip has you covered. Effortless Tip Calculation: Planning a group dinner or a night out with friends? Go Tip makes splitting bills a breeze. Enter the total bill amount, adjust the tip percentage, adjust the number of people in your party, and let Go Tip distribute the individual amounts among your companions. Fair and square! Intuitive Interface: Go Tip boasts a clean and intuitive interface that makes tipping a breeze. No unnecessary buttons or confusing menus—just a straightforward tool to help you calculate tips effortlessly. Go Tip is designed with accessibility in mind. The app works well with VoiceOver and features intuitive navigation, clear visuals, and compatibility with accessibility features on your device, ensuring that everyone can enjoy the convenience of effortless tipping. Download Go Tip now and experience the joy of hassle-free, and ad-free tipping.
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
React Native
Expo
Redux
React Navigation
@react-native-async-storage/async-storage
react-native-reanimated
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.
