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.
Oxygen Calculation Tool is an app designed with transport medical professionals in mind
$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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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 Oxygen Calculation Tool: map the core Reference 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 the input fields confusing or too technical.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited functionality for advanced users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of visual feedback during calculations.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Not enough personalization options.
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.
Oxygen Calculation Tool is an app designed with transport medical professionals in mind. Once you enter your oxygen supply and a flow rate, your minutes of usable oxygen will be generated. Oxygen Calculation Tool makes it easy to add and delete up to 10 cylinders for both the portable and onboard supply. The user also has the flexibility to enter the flow rate as a free flow setting or from ventilation settings, calculated from the minute ventilation and the FiO2 settings. Optionally, user can also enter ventilator-specific bias flow, if needed. Oxygen Calculation Tool also has a countdown feature. This can be used to time your O2 use with your chosen settings. Using the countdown will update the settings automatically. The drip rate calculator can be used to assist you with med math. Enter the supply and dose information and the calculator will determine the rate in ml/hr. Oxygen Calculation Tool contains a reference page, where the math calculation used in this app is outlined, along with a list of oxygen cylinders and associated conversion factors. If you don't see a cylinder size that you need, use the feedback feature found in the settings to let me know and I will try to add it. This app is also dark mode compatible. Calculations are rounded down to the nearest whole minute. ***Please note, this app does NOT subtract 200 psi from initial input to account for residual O2. Some formulas may call for this. If this is desired by users, you can subtract 200 psi from your pressure prior to input.
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.