App Overview

Instant XRP/JPY Calc! icon

Instant XRP/JPY Calc!

Shun Isayama · Finance

this app automatically fetches the latest ripple (xrp) exchange rate, allowing you to instantly convert between “japanese yen to ripple” and “ripple to japanese yen”!

$5.99 · In-app purchases

PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet

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, 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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> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for Instant XRP/JPY Calc!: 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

Include more cryptocurrencies and fiat currencies for conversions.

Assumption to check: Lack of multiple currency support

Validate with people who use this workflow before building.

Hypothesis 2

Enhance history with filtering options by date or amount.

Assumption to check: Limited history view

Validate with people who use this workflow before building.

Hypothesis 3

Add charts or graphs to visualize conversion trends.

Assumption to check: No visual data representation

Validate with people who use this workflow before building.

Hypothesis 4

Introduce features like alerts for XRP price changes.

Assumption to check: Single-use 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

this app automatically fetches the latest ripple (xrp) exchange rate, allowing you to instantly convert between “japanese yen to ripple” and “ripple to japanese yen”! ideal for situations requiring fast and accurate crypto currency conversions — such as managing investments, checking ripple-based payments, or verifying xrp-denominated transactions. <features> ● simple and intuitive interface ● automatically retrieves real-time ripple rates ● supports two-way conversion between yen and ripple ● always shows the latest ripple rate and update time ● numeric keypad for easy input ● large display for quick result checking ● conversion history saving function <how to use> 1. convert yen to ripple * enter an amount in “japanese yen” * tap the “convert to ripple” button * the result section will show the converted ripple amount 2. convert ripple to yen * enter an amount in “ripple” * tap the “convert to yen” button * the result section will show the converted yen amount 3. update the ripple rate * tap the refresh button at the top right to fetch the latest rate * the latest rate is also automatically retrieved when the app launches, but you can refresh manually anytime 4. check conversion history * tap the “history” tab to view past conversions use this app for various purposes such as managing crypto investments, confirming ripple transactions, or monitoring xrp-based trading. because the app always uses a real-time ripple rate, you can get the most up-to-date conversion results. designed for simplicity — anyone can use it easily. from planning cryptocurrency trades to executing them, this tool supports you at every stage. this is a paid app with no advertisements at all.

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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

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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
axios
react-navigation
react-native-paper
BUILD KIT DIFFICULTY
Intermediate

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.