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
Japanese Conjugation City
Japanese Conjugation City is an application that lets you create a test and practice close to 30 different verb conjugations and 6 different adjective conjugations
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
30 ratings · Top 15%
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 included17 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 Japanese Conjugation City: map the core Education 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 gamification and social features to enhance engagement.
Assumption to check: Limited interactive features for learning.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a robust progress tracking system with visual indicators.
Assumption to check: Difficulty in tracking progress.
Validate with people who use this workflow before building.
Hypothesis 3
Offer various learning techniques like audio, visual, and quizzes.
Assumption to check: Lack of diverse learning methods.
Validate with people who use this workflow before building.
Hypothesis 4
Provide better value through tiered subscriptions and more free content.
Assumption to check: High churn rates due to subscription model.
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
Japanese Conjugation City is an application that lets you create a test and practice close to 30 different verb conjugations and 6 different adjective conjugations. Each with their own respective lesson and examples in romaji or Japanese. Features: -Test your knowledge on verb and adjective conjugations with multiple choice or fill in the blank tests -JLPT N5, N4, N3, N2, and N1 verbs and adjectives -Explanations for incorrect answers -Track your stats -Conjugation sheets for every verb and adjective -Searchable verb and adjective list -Tests are scored and can be stopped at any time -Change language display to show any combination of hiragana, romaji, or kanji -Grammar lessons in romaji or Japanese with examples
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
Zustand
axios
React Navigation
react-native-reanimated
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.
