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
Speed Muscles MD
Do you think you know the muscles of your body? How fast can you point to your latissimus, longissimus or lumbricals? Speed Muscles MD is an addictive game that tests your speed and challenges your memory.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
7 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included14 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 Speed Muscles MD: map the core Medical 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
Implement a dynamic content management system for regular updates.
Assumption to check: Limited content updates for medical assessments
Validate with people who use this workflow before building.
Hypothesis 2
Offer a more flexible subscription model with diverse tiers.
Assumption to check: High subscription costs for premium features
Validate with people who use this workflow before building.
Hypothesis 3
Adopt a more minimalistic design approach for better user experience.
Assumption to check: User interface can feel cluttered
Validate with people who use this workflow before building.
Hypothesis 4
Integrate a community feature for users to connect and share experiences.
Assumption to check: Lack of community support or forums
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 think you know the muscles of your body? How fast can you point to your latissimus, longissimus or lumbricals? Speed Muscles MD is an addictive game that tests your speed and challenges your memory. "I wish I had this app available during gross anatomy when I was a first year medical student."-iMedicalApps.com -Contains dozens of images. -Contains hundreds of labeled muscles from all the main regions of the body. -Earn points for precision. -Bonus points for time. -Bonus points for five right answers in a row. -Compare high scores with your friends. -A magnifying glass appears when holding your finger on an image allowing you to achieve more precision and higher scores. -Switch language in the main menu (English, French, Germain/Latin) This is a must have game if you are tackling anatomy for high school, university or medical school. It is more captivating than flash cards. Practice mode allows you to learn specific regions without doing all the previous levels. Review mode lets you replay all the mistake you made in the last game to increase learning speed. Also try Speed Angiology MD and Speed Bones MD to test your knowledge of the circulatory system and bones! I'm open to suggestions so don't hesitate to send me an e-mail if something is missing or not quite right.
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
Redux
React Query
React Navigation
Shadcn/UI
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.
