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.
WHOOP is the leading wearable that turns comprehensive health insights into daily action
Free · 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.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
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 WHOOP: 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: Limited integration with third-party fitness devices
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Complicated subscription model
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface can be overwhelming
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Data privacy concerns
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.
WHOOP is the leading wearable that turns comprehensive health insights into daily action. By capturing dozens of data points every second, WHOOP delivers personalized Sleep, Strain, Recovery, Stress, and health insights—24/7. WHOOP uses those insights to provide coaching based on your body’s unique physiology and recommends everything from when to go to bed to new daily behaviors that will help you reach your goals. If you’re new to WHOOP, you can try both the wearable and app free for 1 month. Terms and conditions apply. WHOOP is screenless, so all your data lives in the WHOOP app—for a distraction-free focus on your health. The WHOOP app requires a WHOOP wearable. How it works: Healthspan*: A powerful way to quantify your age and slow your Pace of Aging. Backed by leading longevity research, it pinpoints the daily habits that impact your long-term health. Sleep: WHOOP helps you understand how well you sleep each night by measuring your Sleep Performance. Every morning, WHOOP provides a Sleep score from 0 to 100%. Sleep Planner calculates how much sleep you need to recover, tailored to your habits, schedule, and goals. You can even set a Haptic Alarm that wakes when you're fully rested, or at a specific time, with gentle vibration. Quality sleep is essential for improving your healthspan, metabolic mental resilience, recovery, and performance. Recovery: WHOOP lets you know how ready you are to perform by measuring your heart rate variability, resting heart rate, sleep, and respiratory rate. You'll get a daily Recovery score on a scale of 1 to 99%. When you're in the green, you're ready for strain, when you're in the yellow or red, you may want to evaluate your training program. Strain: WHOOP does more than just track your activity–it measures cardiovascular and muscular exertion to give you the most comprehensive view of the demands you put on your body. Each day, Strain Target will provide a Strain score from 0 to 21 and recommend your optimal target exertion range based on your Recovery score. Stress: WHOOP gives you daily insights to pinpoint your stressors, understand your physiological response, and discover techniques to help manage. Get a real-time stress score from 0-3 and, based on your score, choose a breathwork session to enhance your alertness or increase relaxation. Behaviors: WHOOP tracks over 160+ daily habits and behaviors—like alcohol intake, medication, and more—to better understand how these behaviors impact your body. WHOOP provides weekly guidance for behavior change and helps set accountability goals with the Journal and Weekly Plan features. WHOOP Coach: Ask questions about your health & fitness and get highly personalized, on-demand answers. Using your unique biometric data, the latest performance science, and generative AI, WHOOP Coach generates responses on everything from training plans to why you’re feeling tired. Menstrual Cycle Insights: Go beyond period tracking to better understand your fifth vital sign and get tailored cycle-based insights. What else you can do in the WHOOP app: • Dig into the details: See heart rate zones, VO₂ Max, steps, and more trends over time to adjust your behaviors, training, sleep and more based on your goals. • Join a team: Stay motivated and accountable by joining a team. Chat directly with your teammates in the app, or as a coach, see how your team's training is going. • Apple Health: WHOOP integrates with Apple's Health app to sync activities and personalize your experience. WHOOP provides products and services designed for general fitness and wellness purposes. WHOOP products and services are not medical devices, not intended to treat or diagnose any disease, and should not be used as a substitute for professional medical advice, diagnosis or treatment. All content available through WHOOP products and services is for general informational purposes only. Discover the future of health and performance. *Some availability restrictions apply.
Written user reviews are not shown here. Check current App Store reviews >
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.