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
My Currency Converter Pro
My Currency Converter Pro is the simplest, most beautiful currency converter you'll ever find
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
2,742 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 included16 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 My Currency Converter Pro: 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
Expand the number of currencies available for conversion.
Assumption to check: Limited currency support compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement automatic background refresh for exchange rates.
Assumption to check: Manual refresh required for exchange rate updates
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the purchase process and provide clear benefits for premium features.
Assumption to check: In-app purchases may confuse users
Validate with people who use this workflow before building.
Hypothesis 4
Add a feature for users to track historical exchange rates.
Assumption to check: No historical data tracking for currency rates
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
My Currency Converter Pro is the simplest, most beautiful currency converter you'll ever find. It supports over 150 different currencies from all around the world, ranging from the US Dollar to the Colombian Peso! It even supports BitCoin, LiteCoin and Dogecoin! If you're travelling, this really is a great app to use - you can find out how much your currency is worth in just a few short moments, even if you aren't connected to the internet! FEATURES - Over 150 currencies supported. - Also supports BitCoin, LiteCoin and Dogecoin! - Incredibly simple interface. - Exchange rates are updated automatically - you don't have to do anything! - "Switch" button to invert the currencies. - Converts as you type (no need for a "Convert" button!) - Uses 3 decimal places for greater accuracy! - Find the current exchange rate of what you're converting. - Optimized for the latest iPhone and iPad models. - Pro version is ad-free and includes Apple Watch support! Let us know if you have any comments or feedback! It's similar in nature to XE currency converter and Currency Converter Plus, but offers a lot more.
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
axios
react-navigation
react-native-picker-select
shadcn/ui
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.
