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.
This app is a BMI (Body Mass Index) calculator
$0.99 · In-app purchases
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.
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.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for WatchBMI: 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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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
Assumption to check: Users may find it difficult to log entries consistently.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited visual progress tracking options.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No social features for motivation or competition.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Potential lack of personalized insights.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
This app is a BMI (Body Mass Index) calculator. It is very simple, in that it asks for input of height and weight, and displays the calculated value for BMI. It does not measure anything; it only displays the calculated BMI based on entered values. I created this for my own practice, because I often need to calculate BMI, and do not want to have to take out and unlock my phone every time. While it will certainly work for an individual to determine her own BMI, it is targeted at users (such as myself) who need to calculate BMI based on the measurements of multiple individuals. It does report the CDC category of the BMI, but does not otherwise interpret any of the data. It does not store or collect any of the entered information. You should know that BMI is only a reflection of height and weight; it does not assess body composition, or differentiate between fat and muscle. Instructions: Simply click on one of the buttons on the main screen to show a keyboard for entering the value. WatchBMI can accept values in either the Metric or the Imperial system. Click the "M" button to change to metric, click the "I" button to change to imperial If Imperial: Click on "Pounds" to enter the weight in pounds. Use the "Back" button to go back to the main screen. Click on "Feet" to enter the feet part of height. Click on "Inches" to enter the inches part of height. If Metric: Click on "Kilos:" to enter the weight in kilograms. Click on "Cms: to enter the height in centimeters. The app does not allow inches greater than 11, feet greater than 7, or weight greater than 999, with similar maximums in metric. Once all three values have been entered, the main screen (again, click the "Back" button) to show the calculated BMI and the CDC category for that BMI. When changing from Imperial to Metric or Metric to Imperial, the height and weight will change as well, so you can enter weight in kilograms and height in feet and inches. Reference Information: Information from the U.S. Centers for Disease Control and Prevention (CDC) provides information about BMI and its appropriate use at https://cdc.gov/bmi BMI is a measure of weight relative to height. According to CDC at https://www.cdc.gov/bmi/about/index.html : BMI is a quick, low-cost, and reliable screening measure for underweight, overweight, or obesity; BMI is a valuable population health measure used worldwide; for individuals, BMI should be considered with other factors, such as blood pressure, cholesterol levels, and physical examination. The CDC Adult BMI Categories are from https://www.cdc.gov/bmi/adult-calculator/bmi-categories.html. BMI and this app does not diagnose or treat any condition. The CDC BMI Categories calculated by this app are designed for adults 20 and older, and do not apply to children. Check with your doctor before using this app or making any medical decisions based on BMI.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.