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 Verb Conjugator Pro
View over 1500 German verbs in 16 tenses
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
255 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 included18 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 Verb Conjugator Pro: 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
Expand database with community contributions.
Assumption to check: Limited verb database compared to other language apps.
Validate with people who use this workflow before building.
Hypothesis 2
Include quizzes and spaced repetition features.
Assumption to check: Lack of interactive exercises for practice.
Validate with people who use this workflow before building.
Hypothesis 3
Implement user profiles with progress stats.
Assumption to check: No progress tracking for users.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance UI/UX with attractive designs and animations.
Assumption to check: Minimal visual appeal.
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
View over 1500 German verbs in 16 tenses. With simple navigation and built in search, you can find the verb you need in seconds. Now with audio!! Not sure how to pronounce a verb? You can now hear how every verb is pronounced. Just tap on the button next to the conjugation. Note: this functionality requires an Internet connection. ● Now with example sentences!! Gain a better understanding of verbs by seeing how each conjugation is used in a sentence. ● Save a list of your favourite verbs. ● View verbs that you have recently looked at. ● Optimised for iPhone 6 Plus - rotate device to landscape to see a split screen view. ● Filter search results to display only those which have audio. ● Peek and pop (iPhone 6S & 6S Plus) - press firmly on a search result to see a preview. Press a bit harder to see the result. ● Shortcut option (iPhone 6S & 6S Plus) - press firmly on the app's icon to quickly search for verbs. ● Export - can now export to other apps (e.g. send to Dropbox). ● Includes the ability to copy, email and print verbs.
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
React Query
React Native Paper
@react-native-async-storage/async-storage
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.
