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
Feel Index
feel index — bridging diet and how you feel
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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'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 Feel Index: 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
Add customizable mood categories and journal prompts.
Assumption to check: Users often find mood tracking apps lack personalization.
Validate with people who use this workflow before building.
Hypothesis 2
Provide deeper analytics with visual trends and recommendations.
Assumption to check: Many apps have limited insight analytics.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social features for sharing experiences or challenges.
Assumption to check: Some users seek community support.
Validate with people who use this workflow before building.
Hypothesis 4
Implement reminders and notifications to encourage daily tracking.
Assumption to check: Users may forget to log their mood.
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
feel index — bridging diet and how you feel scan barcodes, text entry or effortless voice logging of food effortless voice logging just speak - our voice entry makes logging instant and natural say "i had oatmeal with berries and coffee" and we capture everything log meals, medications, supplements, and symptoms hands-free the fastest, most intuitive way to track your health just speak — our voice entry makes logging instant and natural say "i had oatmeal with berries and coffee" and we capture everything log meals, medications, supplements, and symptoms hands-free the fastest, most intuitive way to track your health inflammation & sugar tracking • monitor your dietary inflammation with science-backed scoring • track sugar intake prominently with daily and weekly trends • understand which foods trigger inflammation in your body • get ai insights on reducing inflammation through diet fasting tracker • log and monitor your intermittent fasting windows • track fasting streaks and patterns over time • see how fasting correlates with energy and mood • flexible tracking for any fasting protocol complete medication & supplement profile • build your full medication and supplement regimen • track adherence with smart reminders • see interactions and patterns over time • your entire health stack in one place comprehensive health picture • log medical conditions for complete context • track how conditions interact with diet and lifestyle • build a holistic view for better ai analysis • securely store your health history ai-powered comprehensive analysis • personalized daily, weekly, and monthly insights • ai analyzes your complete health picture — medications, conditions, diet, and lifestyle together • understand complex patterns across all health factors • get actionable recommendations based on your unique situation seamless health integration • apple health sync for steps, workouts, sleep, and heart rate • automatic exercise detection and logging • connect fitbit, oura, withings, and more • all your health data unified in one place feel index score • your daily wellness metric combining all health factors • track inflammation, energy, and mood trends • understand what makes you feel your best • beautiful charts and progress visualization privacy-first design • your data stays on your device and secure cloud • full control over what you share • hipaa-aligned security practices • delete your data anytime with one tap terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
D3.js
Zustand
React Navigation
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.
