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
Optum Engage
Optum Engage can help you build lifelong healthy habits — and get rewarded — by taking small steps toward better health.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
2,760 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.
Build your own version
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 included16 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 Optum Engage: 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
Incorporate social challenges and community features.
Assumption to check: Limited social features for sharing progress.
Validate with people who use this workflow before building.
Hypothesis 2
Add compatibility with wearables for better tracking.
Assumption to check: No integration with wearables like Apple Watch.
Validate with people who use this workflow before building.
Hypothesis 3
Offer personalized nutrition plans based on user goals.
Assumption to check: Lack of personalized meal plans.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify design and enhance usability for a cleaner experience.
Assumption to check: User interface can feel cluttered.
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
Optum Engage can help you build lifelong healthy habits — and get rewarded — by taking small steps toward better health. This powerful tool includes: - Well-being programs - Fun activities - Friendly competitions - Personalized recommendations to help you live healthier Get started by taking a short health survey to better understand how you’re doing in vital areas like nutrition, fitness and stress. Your health profile guarantees a highly personalized experience and includes: * Your health score * Your health factors * Recommendations for achieving a better health score * Your biometrics * Your area of focus Sync your wearable devices or use your phone to track your activity. Select from over 100 missions. These solo activities are designed to help make improvements in all areas of your life from fitness, diet and sleep to emotional and financial well-being. Optum Engage now utilizes HealthSafe ID®, our leading technology that strengthens website authentication protocols and enhances the security of your account by adding dual-factor authentication so it remains safe and secure. Reach out to your healthcare administrator if you have questions.
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
@supabase/supabase-js
react-native-chart-kit
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.
