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
Fast Tip & Split Calculator
Fast Tip & Split is the fastest, simplest way to calculate tips and split bills with friends
$0.99 · In-app purchases
PRICE
$0.99
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.
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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's included15 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 Fast Tip & Split 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
Add options for saving history and customizing tip percentages.
Assumption to check: Limited features such as no history or customization options
Validate with people who use this workflow before building.
Hypothesis 2
Implement a feature for easy input of multiple users.
Assumption to check: Not user-friendly for larger groups
Validate with people who use this workflow before building.
Hypothesis 3
Enable sharing of calculated results via social media.
Assumption to check: No ability to share results easily
Validate with people who use this workflow before building.
Hypothesis 4
Allow offline calculations with local data storage.
Assumption to check: Lacks offline functionality
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
Fast Tip & Split is the fastest, simplest way to calculate tips and split bills with friends. No complex menus, no confusing options – just enter your bill and get instant results. FEATURES • Quick Preset Tips Choose from Dinner (20%), Coffee (10%), or Fast Food (10%) presets for instant calculations • Custom Tip Percentages Tap 10%, 15%, or 20% buttons, or enter any custom percentage you want • Split Bills Easily Use + and - buttons to split among up to 20 people instantly • Smart Rounding Optional rounding to make per-person amounts easier to pay • Beautiful Design Clean, modern interface with full dark mode support • Share Results Instantly share the breakdown with your group via text, email, or any app • Completely Private All calculations stay on your device. No data collection, no tracking, no ads • Swipe to Reset Swipe down anywhere to quickly reset and start a new calculation • Tutorial Included First-time walkthrough helps you get started instantly PERFECT FOR • Dining out with friends or coworkers • Coffee runs with your team • Group lunches and dinners • Food delivery orders • Any situation where you need to split a bill YOUR PRIVACY MATTERS Tip & Split doesn't collect, store, or transmit any of your data. Everything happens right on your device. No accounts, no tracking, no nonsense. SIMPLE & FAST No more awkward math at the table. Tip & Split does the calculations instantly so you can focus on enjoying time with friends. Download Tip & Split today and never struggle with tip calculations again!
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
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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.
