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
NEJM Image Challenge
The NEJM Image Challenge App brings a popular online feature for medical professionals to the iPhone and iPod Touch
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
9 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 included13 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 NEJM Image Challenge: 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
Introduce new challenge categories regularly.
Assumption to check: Limited variety in challenges leading to user fatigue.
Validate with people who use this workflow before building.
Hypothesis 2
Offer a freemium model with limited free challenges.
Assumption to check: In-app purchase model may limit access.
Validate with people who use this workflow before building.
Hypothesis 3
Implement gamification features like badges or leaderboards.
Assumption to check: Difficulty in keeping user engagement over time.
Validate with people who use this workflow before building.
Hypothesis 4
Add forums or discussion boards for users to share insights.
Assumption to check: Lack of community features for discussion.
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 NEJM Image Challenge App brings a popular online feature for medical professionals to the iPhone and iPod Touch. Optimized for viewing on the iPhone and iPod Touch, the NEJM Image Challenge App helps you to test and hone your diagnostic and visual skills anytime, anywhere. Please note: Minimum OS version supported is iOS 7.0. The New England Journal of Medicine is known for its compelling medical graphics and illustrations. The NEJM Image Challenge App randomly selects from over 400 challenging clinical photos published weekly in the NEJM Images in Clinical Medicine series. Choose an image and answer multiple-choice questions. Keep taking the challenge until you get it right and then move on to the next challenge! Features: •Detailed images – zoom in to take a closer look •Get immediate feedback – gain more information about the diagnosis •See how others answered and how many took the challenge •Launch or refresh the app for a new selection of random images Check out NEJM This Week, another NEJM iPhone/iTouch app for medical professionals offering free access to recent articles, and a selection of images, audio and video. ABOUT THE NEW ENGLAND JOURNAL OF MEDICINE The New England Journal of Medicine (NEJM) is the most widely read, cited and influential general medical journal in the world and the longest continuously published medical periodical. NEJM is dedicated to bringing physicians the best research and key information at the intersection of biomedical science and clinical practice, and to presenting the information in an understandable and clinically useful format. A career companion, NEJM is a vital, go-to resource for keeping practicing physicians aware of developments of importance to their patients and for training medical students and residents. The New England Journal of Medicine is a publication of NEJM Group, a division of the Massachusetts Medical Society. We welcome your feedback. Please send comments to [email protected].
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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.
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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.
