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
Pitip: Tip Calculator
Pitip is a fast, discreet tip calculator built to feel at home on iPhone and Apple Watch, not like a generic calculator.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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.
Build your own version
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 Pitip: Tip 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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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
Provide user-defined presets and suggestions based on common bill amounts.
Assumption to check: Limited customization options for tip percentages.
Validate with people who use this workflow before building.
Hypothesis 2
Add a history feature to track past calculations.
Assumption to check: No history of previous calculations.
Validate with people who use this workflow before building.
Hypothesis 3
Implement customizable themes and layouts.
Assumption to check: Basic UI with no themes or customization.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to share their tip calculations via social media or messaging.
Assumption to check: No social sharing options.
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
Pitip is a fast, discreet tip calculator built to feel at home on iPhone and Apple Watch, not like a generic calculator. Paying at the table. Splitting with friends. Rounding to a clean total. Pitip makes tip math effortless. Built for Apple Watch Calculate tips right from your wrist, quick, private, and perfect at the restaurant table. Designed for iPhone A clean, focused interface with the full feature set in one simple flow. Instant tip selection Choose common percentages in one tap or enter a custom tip from 0-100%. Pre-tax or post-tax tipping Choose whether to calculate your gratuity on the subtotal or the final total. You are in control. Share your calculations Send your tip breakdown to anyone at the table with one tap. Make the total Enter the final amount you want to pay and Pitip adjusts the tip automatically, ideal for cash payments and budgeting. Smart rounding Round the final total while keeping the math precise. Split the bill Divide totals evenly and see per-person amounts instantly. Light & Dark Mode Beautiful in any setting. No accounts. No ads. No clutter. Just simple, accurate tip math, done right. Privacy Policy https://pitip.app/privacy.html Terms of Use https://pitip.app/terms.html
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
React Navigation
TypeScript
React Native Paper
Zustand
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.
