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
Countdown to Japan
Turn your Japan travel dreams into daily inspiration!
$2.99 · In-app purchases
PRICE
$2.99
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's included15 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.
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 Countdown to Japan: 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
Incorporate social sharing options to share countdowns with friends.
Assumption to check: Lack of user engagement features such as social sharing.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize countdown themes and notifications.
Assumption to check: Limited personalization options for countdowns.
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline storage for tips and countdowns.
Assumption to check: No offline access to tips and countdowns.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance UI with animations and better design elements.
Assumption to check: Poor user interface and experience.
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
Turn your Japan travel dreams into daily inspiration! Planning your adventure to the Land of the Rising Sun? Make every day until departure special with Countdown to Japan - the most beautiful and feature-rich travel countdown app designed specifically for Japan enthusiasts. BEAUTIFUL JAPAN IMAGERY Stunning high-resolution photos of iconic Japanese landscapes Authentic scenes from Tokyo, Kyoto, Osaka, and beyond Premium image packs featuring temples, cityscapes, and natural wonders Tap to change backgrounds and keep your countdown fresh PRECISION COUNTDOWN Exact countdown to your departure date and time Days, hours, minutes, and seconds display Customizable flight information with airline and flight number Widget support for your iPhone home screen TRAVEL PLANNING FEATURES Share your travel details with family and friends Export calendar invites with your departure information Easy date and time selection with intuitive interface Flight information storage for quick reference SEAMLESS EXPERIENCE iOS Widget for constant countdown visibility Smooth, responsive interface designed for daily use Dark mode support for comfortable viewing Optimized for all iPhone sizes PERFECT FOR: First-time Japan travelers building excitement Return visitors planning their next adventure Travel couples coordinating trip details Anyone who loves Japanese culture and aesthetics PREMIUM IMAGE COLLECTIONS: Unlock exclusive photo collections featuring: Urban Tokyo & Osaka cityscapes Serene temples and traditional shrines Breathtaking Mount Fuji and natural landscapes Transform waiting into wonderful anticipation. Download Countdown to Japan and make every day before your trip a celebration of the adventure ahead!
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 Navigation
Zustand
Expo Date Picker
React Native Async Storage
Tailwind CSS
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.
