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
Grimm's Fairy Tales - Pro
Do you love fairy tales? Or are you learning German?
$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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
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.
JavaScript is required to complete mailbox verification.
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 Grimm's Fairy Tales - Pro: map the core Books workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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 to include other fairy tales and authors to attract a wider audience.
Assumption to check: Limited content variety, only focused on one author
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate audio narration for stories to enhance user experience.
Assumption to check: Lack of interactive features like audio narration
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing features to allow users to share stories on their networks.
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Implement font size, style, and background color options for a personalized reading experience.
Assumption to check: Minimal customization options for reading 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
Do you love fairy tales? Or are you learning German? Grimm’s Fairy Tales brings you 12 of the most beloved fairy tales collected and published by the famous Brothers Grimm. Enjoy timeless classics such as Cinderella, Little Red Riding Hood, Sleeping Beauty, Snow White, and more. Originally written down in the 19th century, these stories have been carefully adapted into modern, easy-to-read language, making them ideal for language learners as well as native speakers. Key Features * 12 classic Grimm fairy tales * Bilingual reading: switch instantly between German and English with a single tap * Listen to the stories: each chapter includes a play button with device-generated voice narration * The app remembers your last selected language * Original illustrations for every story * Adjustable text size for comfortable reading Perfect for: Learners studying German German speakers improving their English Anyone who enjoys beautifully illustrated fairy tales Whether you prefer reading, listening, or switching between languages, Grimm’s Fairy Tales makes classic stories accessible and enjoyable for everyone.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Redux
react-native-share
react-native-gesture-handler
expo-router
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.
