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
Hat Monkey by Chris Haughton
Hat Monkey is a small monkey with a hat who needs our help around the house
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
16 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 Hat Monkey by Chris Haughton: map the core Books 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 more mini-games and interactive storytelling elements.
Assumption to check: Limited interactive features can bore kids after repeated use.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation with larger buttons and icons.
Assumption to check: Navigation can be confusing for young users.
Validate with people who use this workflow before building.
Hypothesis 3
Regularly add new books and features to keep users engaged.
Assumption to check: Content may not be updated frequently.
Validate with people who use this workflow before building.
Hypothesis 4
Make payment processes straightforward and provide clear value for purchases.
Assumption to check: In-app purchases can be unclear or frustrating.
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
Hat Monkey is a small monkey with a hat who needs our help around the house. Young children will find the objectives satisfying as they help Monkey do everyday things they cannot yet do themselves, like turning off lights, opening the door for him, turning the pages of his bedtime book or sending text messages. They can also speak with him on the phone, and play music or simple games like hide and seek. The beautiful simplified graphics and interactions allow even the youngest children to identify what Monkey wants, to empathise with him, and learn how they can help him. Chris Haughton’s award-winning books ‘A Bit Lost’, ‘Oh No, George!’ and ‘SHH!, we have a plan’ have been translated into over 20 languages around the world. Instead of adapting his books, Hat Monkey was conceived and designed from the start as a stand alone app with engaging interaction at its core. Please also check out our other great Apps for kids: „PETTING ZOO“ - is a fantastic storybook app for the iPad and iPhone. It features beautiful, fun, interactive animations of over 20 animals, and it’s bound to be a big favorite for kids and animal lovers of all ages. „NIGHTY NIGHT“ - is the perfect App for a daily go-to-sleep ritual with lovely animals, sweet music and great narration. „LITTLE FOX MUSIC BOX“ – is a sing-along songbook with more than 100 interactive elements in 3 songs and the little fox music studio where you can record your own songs. If you experience any trouble with the App or have any questions or comments, please don't hesitate to contact us any time: [email protected]. We´d love to help you out. Please also mention your device version and your iOS version. Please also visit our website www.foxandsheep.com for more information and support. 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
Zustand
react-navigation
@react-native-reanimated
Firebase
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.
