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
Little Fox Animal Doctor
We received the "Editor´s Choice" award by Apple for "Little Fox Animal Doctor" And in addition our app was awarded the "Tech with Kids' Best Pick Award" for exceptional design of a children's app
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
4,054 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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.
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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 Little Fox Animal Doctor: 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 animal library with more species and care information
Assumption to check: Limited animal selection for learning
Validate with people who use this workflow before building.
Hypothesis 2
Introduce varied game types to keep engagement high
Assumption to check: Repetitive game mechanics
Validate with people who use this workflow before building.
Hypothesis 3
Add community features for sharing progress and achievements
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 4
Implement offline functionality for learning materials and games
Assumption to check: No offline access
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
We received the "Editor´s Choice" award by Apple for "Little Fox Animal Doctor" And in addition our app was awarded the "Tech with Kids' Best Pick Award" for exceptional design of a children's app. Little Fox has caught a cold. Can you help to find him a cure? The bat has broken its wing. Do you know what to do? Whether a bump on the head, a stomach ache from too much candy, a little wound, or a sunburn, these funny animals need the help of a really good doctor! From Oscar-nominated artist Heidi Wittlinger, the illustrator and director behind the bestseller Apps „Nighty Night“, „Little Fox Music Box“ and „Nighty Night Circus“ comes a wonderful new 3D-App which your child will love! The app is full of humorous animations, amazing 3D illustrations, and funny short movies. In the animal doctor’s office, located in a magical treehouse, the animals are waiting to be cured. Kids are playfully guided through applying treatments that they might have experienced themselves: measuring temperatures, taking medicine, getting a plaster. And of course, eating a snail is probably just good for owls! Highlights: 1.There are 7 animals in the App - fox, bat, rabbit, mole, hedgehog, spider and owl, with 21 different injuries, sicknesses, and diseases. 2. Your child has many different treatments and medicines to choose from to cure the animals and make them happy again. 3. Every time your child plays the App the animals have different illnesses, injuries and diseases. 4. Little Fox Animal Doctor is the first 3D-App by Oscar-nominated artist Heidi Wittlinger. She is also the creative genius behind Nighty Night, Little Fox Music Box and Nighty Night Circus. Her Apps have been downloaded over 5 million times worldwide. The App will make your children’s dreams of being an Animal Doctor come true! About Fox & Sheep: We are a Studio in Berlin and develop high quality apps for kids at the age of 2-8 years. We are parents ourselves and work passionately and with a lot of commitment on our products. We work with the best illustrators and animators around the world to create and present the best apps possible – to enrich the lives of our and your kids.
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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
Supabase
Zustand
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.
