App Overview

Percentages Calculator icon

Percentages Calculator

Thomas Tsopanakis · Business

Percentages Calculator is the most powerful percentages calculator designed with simplicity and functionality

$0.99 · In-app purchases

PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
1,342 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 included17 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 Percentages Calculator: map the core Business 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 for calculating discounts, markups, or more complex percentage scenarios.

Assumption to check: Limited functionality for advanced calculations

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to customize themes and input formats.

Assumption to check: Lack of user customization options

Validate with people who use this workflow before building.

Hypothesis 3

Implement sorting and filtering options for historical calculations.

Assumption to check: History management is basic

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

Percentages Calculator is the most powerful percentages calculator designed with simplicity and functionality. Do you struggle making simple percentage calculations in your head? Struggle no more! With this Percentages Calculator you can now perform useful calculations in a couple of seconds. Percentage Calculator contains NINE functions: 1) INCREASE A VALUE BY A PERCENT e.g. Increase 850 by 20% 2) DECREASE A VALUE BY A PERCENT e.g. Decrease 1020 by 60% 3)CALCULATE THE PERCENTAGE OF A NUMBER e.g. How much is 56.98 to 123? 4) CALCULATE PERCENT CHANGE e.g. If a value originally was 314 and now is 225 by what percent has the value changed? 5)CALCULATE PERCENT OF A PART VALUE e.g. 70 is what percentage of 168? 6) FIND THE ORIGINAL VALUE BEFORE A PERCENT INCREASE e.g. If a value is 130 after a 50% increase ,what is the original value before the increase? 7) FIND THE ORIGINAL VALUE BEFORE A PERCENT DECREASE e.g. If a value is 116 after a 22% decrease ,what is the original value before the decrease? 8) x IS y% OF e.g. 77 is 80% of what? 9) FRACTION TO PERCENT e.g. The fraction: 76.89 / 91.89 is the same as what percent? COPY TO CLIPBOARD Copy the computational result to clipboard immediately and use it in seconds - Tested by professionals all over the world and is working to the 100%. - No flaws and no additional in-app purchases - Designed with simplicity and functionality - Universal App

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
Zustand
react-navigation
expo-status-bar
react-native-gesture-handler
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.