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.
Vitalbook is an overall health management app that works with Health.
$2.99 · 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.
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 Vitalbook 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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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 report difficulty in customizing health metrics.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: The app sometimes crashes on data entry.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited integration with wearables.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of social features for community support.
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.
Vitalbook is an overall health management app that works with Health. The app has many features to help keep track of your health. These include the step counter using motion co-processors, route tracker using GPS to track your jogging and cycling routes, and fitness tracker for your workouts, such as push-ups, sit-ups, squats, and pull-ups, using various sensors. With the app, you can also manage your sleep by setting an alarm to ring during the rapid eye movement (REM) stage of your sleep, which is when you can more easily wake up. Start a fresh new day every day with Vitalbook! ※ When you keep the GPS operating in the background while using the route tracker for an extended period of time, your battery will drain quickly. Please keep an eye on the battery level when you use the route tracker for a long time or without an external battery. 《 Main Features 》 - Compatible with iOS 26. - Apple Watch app. - Health app access. - Step counter using the motion co-processor or Health. - Route tracking using GPS. - Push-Ups using proximity sensor. - Sit-Ups using gyroscope. - Squats using accelerometer - Pull-Ups using accelerometer. - Hydration management. - Body weight management. - Blood pressure management. - Heart rate management. - Blood glucose management. - Body temperature management. - Sleep management. 《 URL Scheme 》 vitalbookpro: 《 Differences between the free and paid versions 》 - No advertisements in the paid version.
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.