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
German Grammar
Quick Reference of Basic German Grammar
$18.99 · In-app purchases
PRICE
$18.99
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 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 German Grammar: map the core Reference 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
Offer interactive quizzes with instant feedback.
Assumption to check: Limited interactivity in exercises.
Validate with people who use this workflow before building.
Hypothesis 2
Implement user-specific recommendations based on progress.
Assumption to check: Lack of personalized learning paths.
Validate with people who use this workflow before building.
Hypothesis 3
Regularly update content and allow user submissions.
Assumption to check: Static content can become outdated.
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing options and community features.
Assumption to check: No social features for sharing progress.
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
Quick Reference of Basic German Grammar General - Alphabet - Pronunciation - Cases Nouns - Articles - Gender - Plural - Declension Pronouns - Personal pronouns - Reflexive pronouns - Possessive pronouns - Demonstrative pronouns - Relative pronouns - Interrogative pronouns - Indefinite pronouns Adjectives - Declension - Comparison - Adjectives and prepositions Adverbs - Intensifying adverbs - Adverbs of time - Adverbs of place - Adverbs of direction - Adverbs of manner - Position of adverbs - Pronominal adverbs Verbs - Present tense - Present perfect tense - Past tense - Past perfect tense - Future tense - Future perfect tense - Present participle - Past participle - Imperative - Modal verbs - Subjunctive I - Subjunctive II - Passive - Infinitive - Infinitive with zu - Separable and inseparable prefixes - Reflexive verbs - Verbs and prepositions - Irregular verbs - Noun-verb combinations Numerals - Cardinal numbers - Ordinal numbers - Fractions - Time - Date - Calculations Conjunctions - Coordinating conjunctions - Subordinating conjunctions Prepositions - Accusative prepositions - Dative prepositions - Two-way prepositions - Genitive prepositions Sentences - Word order - Negation
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
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Zustand
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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.
