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
Correlate - Health Insights
Recovery
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
2 ratings · Top 30%
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 included18 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 Correlate - Health Insights: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Recovery. Strain. Sleep. Readiness — from the Apple Watch you already wear. Correlate turns your Apple Health data into the daily recovery, strain and sleep scores you'd expect from a dedicated fitness band or smart ring — with no extra hardware to buy, no monthly subscription, and your health data never leaving your iPhone. ◈ YOUR DAILY READINESS One verdict each morning: push today, or back off and recover. • Recovery, Strain & Sleep — three scores, one glance • Health Score that shows what went into it • Stress Load, daily energy, HRV resilience & Biological Age • Sleep stages (REM, Deep, Core), sleep debt and consistency ◈ ALREADY WEAR A RING OR A STRAP? BRING IT ALL TOGETHER • Import your Oura and WHOOP official exports — parsed entirely on-device, no account linking • Garmin and other watches that sync to Apple Health are picked up automatically • One place for every source and every score, and your history stays yours if you ever cancel a membership ◈ FIND WHAT ACTUALLY MOVES YOUR NUMBERS Does late caffeine wreck your sleep? Does a hard run lift tomorrow's HRV? • A 20-second daily journal: a few yes/no questions you chose • With vs. Without: how your recovery really looked on days you did a habit vs. days you didn't • Auto-Discovery scans for real correlations (Pearson r), including delayed effects up to 7 days out — labeled as patterns, never as proof ◈ BUILT FOR PEOPLE WHO READ THE NUMBERS • Pro-grade stats: median, standard deviation, variability, trends and outliers • Dual-axis charts and scatter plots you can interrogate • A plain-English coach that shows its work, generated on your iPhone ◈ NO SUBSCRIPTION. NO NEW WEARABLE. TOTAL PRIVACY. • One-time purchase — no monthly fees, ever • Works with the Apple Watch and iPhone you already own • 100% on-device analysis — no account, and your health data never leaves your phone. Anonymous, non-personal usage statistics only. Stop renting your health insights. Own them. Requires an iPhone with Apple Health data. An Apple Watch is recommended for recovery, strain, heart-rate and sleep metrics.
Written user reviews are not shown here. Check current App Store reviews >
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 sharing options.
Assumption to check: Lack of user engagement features like social sharing or challenges
Validate with people who use this workflow before building.
Hypothesis 2
Provide more detailed analytics and customizable insights.
Assumption to check: Limited insights and metrics offered
Validate with people who use this workflow before building.
Hypothesis 3
Implement a guided onboarding process to help users navigate features.
Assumption to check: Poor onboarding experience
Validate with people who use this workflow before building.
Hypothesis 4
Add achievements and gamified progress tracking to motivate users.
Assumption to check: Absence of gamification elements
Validate with people who use this workflow before building.
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
Zustand
Supabase
React Native Reanimated
BUILD KIT DIFFICULTY
Advanced
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.
