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
Read Japanese: Momotarō
key features:
$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.
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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/
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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 Read Japanese: Momotarō: map the core Books 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
Introduce gamified elements like quizzes or progress tracking.
Assumption to check: Limited interactivity in reading apps.
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing options and community features.
Assumption to check: Lack of user engagement features.
Validate with people who use this workflow before building.
Hypothesis 3
Provide clear explanations and trials for premium features.
Assumption to check: In-app purchase confusion.
Validate with people who use this workflow before building.
Hypothesis 4
Implement better search and filtering capabilities.
Assumption to check: Difficulty in finding specific story content.
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
key features: dual-language reading: seamlessly switch between japanese and english to enhance your understanding of the story and the language. word matching: match japanese words with their english meanings to reinforce vocabulary and grammar comprehension. detailed sentence breakdowns: explore grammar, definitions, and structure with in-depth explanations for each sentence. interactive learning: tap on words or phrases for instant translations, pronunciations, and usage tips. immersive experience: enjoy a beautifully designed interface that reflects the charm of this classic folktale. why you'll love it: perfect for beginners and intermediate learners looking to improve their japanese skills. learn japanese with the tale of momotaro! dive into the timeless japanese folktale of momotaro in an interactive and engaging way! this app brings the beloved story of the "peach boy" to life with side-by-side japanese and english text, making it perfect for language learners, cultural enthusiasts, or anyone who loves a good story. combines storytelling with language learning for a fun and memorable experience. helps you build confidence in understanding japanese text, grammar, and vocabulary. unlock the magic of japanese language and culture through the enchanting story of momotaro. whether you're a language learner, an anime fan, or just curious about japanese folklore, this app is for you! download now and start your journey with momotaro!
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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
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
React Navigation
Axios
expo-av
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.
