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
Calmia: Health Tracker
What if a quick look at your phone could help you understand your body better?
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.4
390 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.
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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Combine features and design from your favorite apps.
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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 Calmia: Health Tracker: map the core Utilities 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
Expand tracking options to include custom metrics.
Assumption to check: Limited metric types available for tracking
Validate with people who use this workflow before building.
Hypothesis 2
Implement graphs and charts for better insights.
Assumption to check: No data visualization for trends
Validate with people who use this workflow before building.
Hypothesis 3
Add customizable reminders for users to log metrics.
Assumption to check: No reminders for tracking metrics
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social sharing and community challenges.
Assumption to check: Lack of community features
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
What if a quick look at your phone could help you understand your body better? Calmia turns your phone's camera into a personal wellness companion. Using advanced optical imaging and AI, it reads subtle signals from your face and translates a short scan into clear, easy-to-follow wellness insights. No wearables. No finger pricks. No manual logging. Just open Calmia, scan your face, and see your results in seconds. AI Face Scan — Wellness at a Glance A single scan gives you an estimate of the signals that matter most: - Heart rate, HRV & cardiac workload - Breathing rate & stress level - BMI & skin age - …and more All from your camera — anytime, anywhere. Focus on What Matters Today You shouldn't have to decode a screen full of numbers. Calmia surfaces only the signals worth your attention right now and wraps them in a calm daily summary — clarity instead of clutter. See the Bigger Picture 7-day and 30-day trends reveal gradual shifts that a single reading would miss Bite-sized Insights explain what each signal means, informed by trusted sources such as the WHO Private by Design Your scans are for your eyes only. No social feeds. No ads built on your data. No distractions — just you and your wellness journey. Built on Patented Technology Calmia's face-scanning experience is powered by patented optical imaging technology, designed to estimate wellness signals from everyday camera footage. PLEASE NOTE: Calmia is not a medical device and is not intended for medical purposes. Its features are not a substitute for the clinical judgment of a healthcare professional. The app is designed to support your general wellness awareness and is not intended to diagnose, treat, cure, mitigate, or prevent any disease, symptom, disorder, or abnormal physical condition. If you believe you may have a medical concern, please consult a qualified healthcare professional or contact emergency services. Learn More: Privacy Policy: https://www.calmiaapp.com/privacy-policy Terms of Use: https://www.calmiaapp.com/terms-of-use Questions? Email us at [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.
SUGGESTED BUILD STACK
React Native
Expo
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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.
