App Overview

TaxAndTip icon

TaxAndTip

Ricardo E. Marrero Guzman · Finance

TaxAndTip works out the sales tax, the tip and the total of your bill in seconds

$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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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/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for TaxAndTip: 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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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

TaxAndTip works out the sales tax, the tip and the total of your bill in seconds. Now it also splits the bill between everyone at the table. Type the subtotal from your receipt. TaxAndTip finds the state you are in, applies its sales tax, adds the tip you choose and shows a clear breakdown: state, county and local tax, tip and total. SPLIT THE BILL • Divide the total equally between up to 20 people. • Or tap a person and enter what they ordered. Their tax and tip follow what they ordered, and everyone else shares the rest equally. • The shares always add up to the exact total, to the cent. SALES TAX FOR YOUR STATE • Built-in rates for all 50 states, Washington, D.C. and Puerto Rico. • Your state is detected from your location, or you can pick it from the list. • Switch between the standard rate and the reduced rate in states that have one. • Edit the state, county and local rates so they match your receipt. TIPS YOUR WAY • Choose from your own list of tip percentages, or no tip. • Add and remove percentages in Tip Settings. • The tip is calculated on the subtotal, before tax. IPHONE, IPAD AND APPLE WATCH • Start a bill on your iPhone and see it on your Apple Watch, or the other way around. • Split the bill equally right from your wrist. • The tax rates and tip options you set on your iPhone are sent to your Apple Watch. • A layout made for iPad and for landscape. PRIVATE • No account and no ads. • Your location is only used to find your state. TaxAndTip does not collect any data. The built-in rates are typical values for each state. Sales tax can vary by county and city, so check your receipt and adjust the rates in Tax Settings if yours is different.

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 or stepper for precise adjustments.

Assumption to check: Users find it hard to adjust tip percentages accurately.

Validate with people who use this workflow before building.

Hypothesis 2

Add features to save and categorize past calculations for better user engagement.

Assumption to check: Limited history tracking.

Validate with people who use this workflow before building.

Hypothesis 3

Simplify the paywall and clarify what features are behind the paywall.

Assumption to check: In-app purchase process can be confusing.

Validate with people who use this workflow before building.

Hypothesis 4

Allow users to set default tip and tax percentages based on preferences.

Assumption to check: Lack of customization options.

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.

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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.