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
Emergency Ultrasound Handbook
If you are learning point of care ultrasound or want a quick review of an exam you haven't performed in awhile, this is the perfect app for you! Brought to you by the guys at 3rd Rock Ultrasound, this is the best poin...
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
33 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 included16 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 Emergency Ultrasound Handbook: 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
Provide downloadable content for offline access.
Assumption to check: Limited offline access to ultrasound content.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a guided onboarding experience.
Assumption to check: Navigation can be confusing for new users.
Validate with people who use this workflow before building.
Hypothesis 3
Offer clear explanations and previews of features before purchase.
Assumption to check: In-app purchases may confuse users.
Validate with people who use this workflow before building.
Hypothesis 4
Add a forum or Q&A section for users to share experiences.
Assumption to check: Lack of community features for user interaction.
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
If you are learning point of care ultrasound or want a quick review of an exam you haven't performed in awhile, this is the perfect app for you! Brought to you by the guys at 3rd Rock Ultrasound, this is the best point of care ultrasound app for physicians, APPs and medical students who want to improve their point of care ultrasound prowess. We combine illustrations, still images and labeled videos in a dynamic way to help you really understand point of care ultrasound. With our new pathology section, we have provided you with still images, illustrations and labeled videos to focus your attention on what truly matters. This pathology section also serves as a great tool for more experienced point of care ultrasound users and ultrasound educators. Exams include: Abdominal Aorta Cardiac DVT EFAST Gallbladder Ocular Pulmonary Renal Resuscitation Soft Tissue Transabdominal and Transvaginal Pregnancy Vascular Access Each exam includes the purpose, details and important pearls for that exam. We also provide a quick reference for normal exam measurements. Finally, we have a section where you can save and store your own personal notes.
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
Zustand
react-native-gesture-handler
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.
