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.
Biorhythm Calculator can help you better understand your physical, emotional, and intellectual state
$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.
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 Biorhythm Calculator: 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 customization options for biorhythm calculations
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases can be unclear
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of supporting educational content
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.
Biorhythm Calculator can help you better understand your physical, emotional, and intellectual state. This can be helpful in making decisions about your health, work, and relationships. Features of Biorhythm Calculator include: Physical biorhythms: A rhythm or cycle in the human body that is controlled by the body's natural systems. This rhythm is said to be responsible for many physical functions, including metabolism, immunity, and even fertility. Some believe that physical biorhythm can be used to predict a person's physical well-being, and that by tracking this rhythm, one can improve their overall health. Intelligence Biorhythm: A rhythm or cycle that tracks your cognitive performance by tracking your brainwave patterns. This uses a special algorithm to generate a personalized biorhythm chart that you can use. It is believed by some to offer insights into focus, concentration, and memory. Emotional Biorhythm: Tracks emotions that are possibly influenced by physical and mental states. The theory suggests that we have three emotional states: positive, negative, and neutral. These states are cyclical, and our emotions change as our physical and mental states change. The theory of emotional biorhythm can be used to help us understand our emotions and how to manage them. Biorhythm Calculator features: - Track your biorhythm - Insights into Intelligence, Emotional and physical cycles - Biorhythm charts for 14 days into the future - Inspirational quotes and sayings - Awards and achievements for unlocking special biorhythms - Personalized to your birth date Biorhythm Calculator is a biorhythm tracker for your intelligence, emotional and physical cycles.
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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.