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
Lilly Health™
Lilly Health™: Your journey, your way
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
4,139 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 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 Lilly Health™: 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 robust backend for real-time data syncing.
Assumption to check: Users report difficulties with data syncing across devices.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize what metrics they want to track.
Assumption to check: Limited customization options for health metrics tracking.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify and declutter the UI for better usability.
Assumption to check: User interface can feel cluttered.
Validate with people who use this workflow before building.
Hypothesis 4
Add features for refill reminders and interactions checking.
Assumption to check: Inadequate support for medication management.
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
Lilly Health™: Your journey, your way Whether you’re on Zepbound® (tirzepatide), Mounjaro® (tirzepatide) or Foundayo™ (orforglipron), Lilly Health™ offers personalized information, education, and insights to help you feel supported throughout your treatment journey, at no cost. Please see Indication and Safety Summary with Warnings for Mounjaro at mounjaro.lilly.com/risk Please see Indications and Safety Summary with Warnings for Zepbound at zepbound.lilly.com/risk Please see Indication and Safety Summary with Warnings for Foundayo at foundayo.lilly.com/risk When you download and use the Lilly Health™ mobile app, features will be customized based on your treatment and condition and may include: LOGBOOK: Track medicines, activity, and more—all in one place. PERSONALIZED SUPPORT: Lilly Health™ offers personalized information, education and insights to help you feel supported on your treatment journey—plus timely notifications to help keep your momentum going. CUSTOMIZE ALERTS: Set up dosing reminders to help stay on track with your medicine. VISUALIZE TRENDS: Review patterns, trends, and progress using charts and custom time ranges to share with your Health Care Provider. MEDICINE SUPPORT: Access savings information, keep track of your dose, and make updates if you and your doctor decide to make any changes. CONNECT DEVICES: You can choose to sync smart devices and apps for your convenience. LEARN & EXPLORE: Discover helpful articles, healthy recipes, and guided movement videos in our content library. Note: This app is intended for the exclusive use of U.S. residents 18 years of age and older. Lilly Health™ is not intended to provide treatment decisions or replace the care and advice of a licensed Health Care Provider (HCP). All medical analysis and treatment plans should be performed by a licensed HCP. Still have questions? Call 1-800-LillyRx (1-800-545-5979) for additional support (available Monday to Friday 9 am - 5 pm EST). Zepbound® and Mounjaro® are registered trademarks and Lilly Health™ and Foundayo™ are trademarks owned or licensed by Eli Lilly and Company, its subsidiaries, or affiliates.
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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.
SUGGESTED BUILD STACK
React Native
Expo
axios
react-navigation
@react-native-chart/line
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.
