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
MatDoc
The purpose of this application is to aid the user in the identification of skin conditions common to wrestlers.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
7 ratings · Top 30%
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 MatDoc: map the core Health & Fitness 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
Add extensive exercise library and customizable routines.
Assumption to check: Limited workout variety and customization options
Validate with people who use this workflow before building.
Hypothesis 2
Include social challenges and community support.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Enable integration with Apple Watch and other fitness devices.
Assumption to check: No integration with wearables
Validate with people who use this workflow before building.
Hypothesis 4
Simplify subscription tiers and provide clear information on benefits.
Assumption to check: Subscription management can be confusing
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
The purpose of this application is to aid the user in the identification of skin conditions common to wrestlers. The user - a coach, trainer, nurse, parent, wrestler, referee - will normally be confronted with some type of skin abnormality, perhaps an infection. It is known that most skin conditions present themselves at certain regions of the body. Therefore, the user will be presented a map of the body, from which the user will select the location of the wrestler's skin abnormality. The user will be presented with a gallery of photos associated with that location on the body. Each photo is linked to only one skin condition. One skin condition can link to many photos. The user can select from the gallery a photo that most closely matches the wrestler's condition. The user can then center, zoom in/out, to observe different parts of the photo. From the photo the user has the option to view a description of the condition linked to the photo or go back to the gallery to select a different photo. The use of this app is to assist the user in diagnosing an infectious skin condition. It's usage is at the discretion of the end user and should never replace the relationship you have with or opinion of your physician.
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
react-native-chart-kit
zustand
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.
