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 Measurement - Measure Up
Do you want to track your weight loss (or muscle gain) journey but struggle to find a simple, no-fuss app?
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
11 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/
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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 Measurement - Measure Up: 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
Expand measurement options to include additional body parts.
Assumption to check: Limited measurement types compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing for users to share progress.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Enhance data visualization with more graph types and comparisons.
Assumption to check: Minimal data visualization options
Validate with people who use this workflow before building.
Hypothesis 4
Implement guided onboarding to improve user engagement.
Assumption to check: Inconsistent user onboarding experience
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
Do you want to track your weight loss (or muscle gain) journey but struggle to find a simple, no-fuss app? You've tried recording measurements in notes or spreadsheets but find that it takes too long... Or, you can't find a way to chart your progress in a way that makes sense? Not to worry! Measure Up is your no-fuss, easy-to-use Weight & Body Measurement Tracker tool for tracking weight loss and muscle gains! The interface provides the fastest method for recording measurements and highlights which body parts have and haven't been tracked on a given day. You'll never lose where you're up to! Don't waste any more time interpreting your progress. Your weight loss & muscle gain progress is now easy to follow. Find all of your measurement history in a single location! View data in Chart, Table and List formats. Pick one that works for you! Integrate with Apple Health to sync measurements with your favorite health apps. No subscriptions and no hidden in-app purchases! Get started today! Key Features: Easy Measurements - Quickly add measurements with our simple-to-use interface. - Add past measurements by adjusting the date. - Estimate your body fat quickly and easily using the in-app body fat calculator. Chart Analysis - Our unique chart allows you to view all your data in one spot! - Toggle measurements on and off from the legend toolbar. - Stack your lean mass, body fat and muscle to get a clear picture of how you are progressing with your goals. - Export to PNG image format and share via popular apps. Your Measurement History - View all of your measurement history and notes. -Toggle between Table and List view to access data the way you want! Analysis & Key Stats - View your body composition and Body Mass Index (BMI). Customizable Measurements & Colors! - Add your own custom Length, Weight or Percentage measurements. - Change up the colors of your measurements and chart. Other Great Features: - Data Back Up & Restore: Never lose your data! Back up information any time to your chosen cloud storage service.
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
Victory Native
Zustand
React Navigation
DateTimePicker
BUILD KIT DIFFICULTY
Starter
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.
