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
TipMate – Smart Tip Calculator
TipMate makes tipping quick and stress-free
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 ratings · Top 5%
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 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 TipMate – Smart 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
TipMate makes tipping quick and stress-free. Calculate the tip, split the bill with friends and check how tipping works in other countries, all in one simple app. Key features Smart tip calculator Pick 15%, 18%, 20% or your own default and see the tip and total instantly. Round up or down with one tap. Split the bill Split evenly between any number of people, or set a custom share for each person. International tipping guide See tipping customs for the United States, Canada, UK, France, Japan, Australia and more. Share the summary Send the bill, tip and per-person total to your group in one tap. Private and offline No account and no tracking. Everything stays on your iPhone. Sharing rent and bills with roommates? Try Fairloom from JetRise. Privacy Policy: https://jetriseitsolutions.com/Privacy-Policy/ Terms of Use: https://jetriseitsolutions.com/terms-of-use/ Support: [email protected]
Written user reviews are not shown here. Check current App Store reviews >
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
Implement a more user-friendly slider with detailed options.
Assumption to check: Users may find it difficult to customize tip percentages.
Validate with people who use this workflow before building.
Hypothesis 2
Add features for entering multiple user contributions.
Assumption to check: Limited functionality for splitting bills among multiple users.
Validate with people who use this workflow before building.
Hypothesis 3
Include graphs or charts to visualize tip distributions.
Assumption to check: No visual representation of calculations.
Validate with people who use this workflow before building.
Hypothesis 4
Add currency selection and conversion features.
Assumption to check: Lack of support for multiple currencies.
Validate with people who use this workflow before building.
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
React Navigation
React Native Gesture Handler
TypeScript
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.
