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
Head Study
Artists have always needed a quick and easy reference to help them understand the anatomy & forms of their portrait models
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
34 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/
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 Head Study: 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
Introduce gamification and interactive elements.
Assumption to check: Limited interactivity in lessons
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to download lessons for offline use.
Assumption to check: No offline access to lessons
Validate with people who use this workflow before building.
Hypothesis 3
Implement adaptive learning paths based on user progress.
Assumption to check: Lack of personalized learning paths
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed explanations for quiz answers.
Assumption to check: Inconsistent feedback on quizzes
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
Artists have always needed a quick and easy reference to help them understand the anatomy & forms of their portrait models. The Head Study App, is that resource. These portrait models were created to make the study of portraiture easier, but also to enhance your knowledge of the human form. The appearance of the face can be understood best by studying what is underneath the surface. The simplified planar head and the skull in this app are made with the same proportion to make this comparison as clear as possible. FEATURES: + Simplified “planes of the head” model + Anatomically correct male skull model + Tumble and zoom the 3D model from 360 degrees + Adjust the position & strength of multiple lighting situations + Switch between simplified planes, skull, and muscular views + Toggle an informational overlay indicating, key structural features, or anatomical insights + Adjustable background value This app was developed to go along with the lessons on my Patreon page. If you have interest in learning to draw and paint portraits better you can find all of my lessons at: patreon.com/StephenBaumanArtwork Any questions? Contact us at: [email protected]
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
Supabase
React Navigation
Zustand
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.
