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
Dollar+ ARS USD Converter
The only app that, in addition to showing Blue, MEP, CCL, Official, and Card rates, lets you record your savings in USD/EUR, calculate average cost, and see your real profit/loss at the market’s buy price.
$0.99 · In-app purchases
PRICE
$0.99
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Dollar+ ARS USD Converter: 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 features like saving history and currency alerts for better user engagement.
Assumption to check: Limited features compared to full finance apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement multiple sources for exchange rates to ensure reliability.
Assumption to check: Real-time exchange rates may not always be accurate
Validate with people who use this workflow before building.
Hypothesis 3
Include tutorials or tips on how to effectively use the app.
Assumption to check: Lack of user education on using currency converters
Validate with people who use this workflow before building.
Hypothesis 4
Expand to support more currencies to attract a broader audience.
Assumption to check: No options for other currencies
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
The only app that, in addition to showing Blue, MEP, CCL, Official, and Card rates, lets you record your savings in USD/EUR, calculate average cost, and see your real profit/loss at the market’s buy price. Dolar+ allows you to monitor, compare, and analyze the main exchange rates in Argentina: - Instant Converter - Personal Savings Ledger - Manage your foreign currency savings directly from the app. • Record deposits and withdrawals • View your net position in USD or EUR • Automatic weighted average cost calculation • Real-time valuation using the buy price • Profit/Loss in ARS and percentage terms • Data stored locally on your device Designed for how the Argentine market actually works. - Gap Comparator - Smart Comparison Tool - Evaluate exchange rate scenarios and decisions using up-to-date data. - Widgets and Native Experience Dolar+ is a personal finance tool designed to understand and manage the Argentine foreign exchange market from your iPhone.
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
expo-localization
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.
