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
Body Measurements Pro
Body Measurements Pro is the cleanest, most comprehensive body tracking app for iOS
$1.99
PRICE
$1.99
No 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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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 Body Measurements Pro: 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 sharing and challenges.
Assumption to check: Limited user engagement features
Validate with people who use this workflow before building.
Hypothesis 2
Add more detailed charts and analytics.
Assumption to check: Difficult to visualize progress
Validate with people who use this workflow before building.
Hypothesis 3
Introduce push notifications for reminders.
Assumption to check: Lack of reminders for measurements
Validate with people who use this workflow before building.
Hypothesis 4
Enable HealthKit or Google Fit integration for seamless data tracking.
Assumption to check: No integration with health apps
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
Body Measurements Pro is the cleanest, most comprehensive body tracking app for iOS. No subscriptions. No ads. No account. Every measurement lives on your device, private by design. Whether you're building muscle, losing fat, or simply keeping an eye on your health, Body Measurements Pro gives you the full picture: from neck to calves, weight to BMI to body fat percentage. TRACK EVERYTHING: Log circumference measurements for 13 body locations: neck, chest, shoulders, biceps (left & right), forearms (left & right), waist, hips, thighs (left & right), and calves (left & right), plus weight, BMI, and body fat percentage. Backdate any entry so a missed day is never a missed data point. BEAUTIFUL PROGRESS CHARTS: Every measurement gets its own line chart. The trend badge in each header shows your net change (+2.5 cm / −4.2 kg) over your selected window so you always know which direction you're heading. Set a personal goal for any measurement and a dashed target line appears on its chart. Filter by 3, 6, or 12 months, or set a custom date range. Drag to reorder charts to match your priorities. PROGRESS PHOTOS: Document your transformation with progress photos. Browse them in a full-screen viewer with a thumbnail filmstrip to quickly scrub through your visual timeline. Pinch to zoom, double-tap to toggle. Every photo shows its date. SYMMETRY COMPARISON: The Symmetry section automatically compares your left and right side for all bilateral measurements - biceps, forearms, thighs, and calves - so you can spot and correct imbalances before they become habits. YOUR DATA, YOUR DEVICE: All data is stored locally. No account required. No cloud. Nothing ever leaves your iPhone or iPad.
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.
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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.
