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
Currency++
Currency++ AI — Your All-in-One Travel Companion
$3.99
PRICE
$3.99
No 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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Build Kit
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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/
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 Currency++: map the core Travel 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 currencies and real-time updates.
Assumption to check: Limited currency options compared to other apps.
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline caching for recent conversions.
Assumption to check: No support for offline use.
Validate with people who use this workflow before building.
Hypothesis 3
Add a feature to save and view conversion history.
Assumption to check: Inability to save conversion history.
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed historical data and graphs for users.
Assumption to check: No detailed exchange rate information.
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
Currency++ AI — Your All-in-One Travel Companion Stop switching between a currency converter, a weather app, a translation tool, and safety guides. Currency++ AI is the ultimate "Swiss Army Knife" for travelers, combining real-time exchange rates with AI-powered location intelligence. • No Subscriptions. No Ads. No Hidden Fees. • One purchase. Lifetime access. AI-Powered Local Safety Reports Powered by Google Gemini, Currency++ generates an instant AI safety analysis of your exact location. Get a real-time read on neighborhood conditions, local risks, and essential traveler advice anywhere in the world. Know Everything About Where You Are Tap the map pin or search any city, and instantly discover: • Your exact street address, city, and country • Local emergency numbers & international dialing codes • Traveler & Resident Safety Rankings for 150+ countries • 24-hour weather forecasts with hourly temps, wind, humidity & sunrise/sunset • Live UV Index (with peak time) & Air Quality (AQI) to protect your health • Compass heading, altitude, speed, and exact DMS coordinates • Floating home-timezone clock with distance and time difference from home Currency Conversion & Interactive Charts • Real-time exchange rates for 77 currencies • Swipe any currency to compare rates on interactive charts: 1D, 5D, 1M, 3M, 6M, YTD, 1Y, 5Y, and Max • Works offline using your last-synced rates • Fast pull-to-refresh accuracy Travel Karma & Lunar Calendar • Travel Karma: daily travel alignment based on your Chinese zodiac and the lunar calendar—know your auspicious travel hours and day-officer guidance • Chinese lunar calendar with all major holidays (Spring Festival, Mid-Autumn, Dragon Boat, and more) • Moon phase tracker with Full Moon & Blue Moon alerts Built for the Modern Explorer • Translation Phrases: prepare and translate quick phrases for your trip • Camera Text Scan: snap a photo and extract text for instant translation • Smart Travel Notes: save memories with automatic iCloud backup & restore • Tip Calculator: split bills in any currency • Health Integration: track daily steps via Apple Health • Postcard Mode: overlay your photos and save to your library • Daily motivational quotes to keep you inspired Speaks Your Language Fully localized in English, Chinese (Traditional & Simplified), Spanish, French, Japanese, Italian, Korean, Portuguese, and Dutch. Why Travelers Choose Currency++ Other apps just give you exchange rates and then charge a monthly fee. Currency++ gives you currency, charts, AI safety, weather, UV, air quality, translation, lunar calendar, and location data—all in a single, beautifully designed app. Travel smarter. Travel safer. Download Currency++ AI today.
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
Zustand
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.
