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.
Know the current and trends
$2.99
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.
Your first Build Kit is free with a verified email.
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 Drift: Current Tracker: map the core Navigation 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: Real-time tracking may be inaccurate or delayed
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization for saved locations
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Data usage for continuous tracking can be high
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.
Know the current and trends. Win more races. Drift measures real water current at your exact GPS location — direction in degrees true and speed in knots — in 30 seconds. Not a tide forecast. Not a modeled estimate. The actual current at your boat, right now. Every racing sailor knows that current is one of the biggest factors on the racecourse. The boat that knows what the current is and what it's doing wins the layline call, starts on the favored end, and rounds the mark first. Until now, getting that number meant guessing from a chart, estimating from a buoy, or just guessing and hoping that you got it. Drift changes that. — HOW Drift WORKS — Drop in any semi-submersible floating object into the water. Tap Mark Start. Watch the current carry it. Move to your marker and tap Mark End. Drift instantly calculates everything you need — direction in degrees true, speed in knots, so you're never left guessing again When you start measuring the current drift displays the time with a progress bar to let you know when you've been timing long enough — WHAT MAKES DRIFT DIFFERENT — All the other apps that give current are estimated based off charts and forecasts, but those can be wildly inaccurate, the current can vary even on a small dinghy race course, and even more when you're talking off shore racing Drift measures what is actually happening at your exact coordinates. The local bathymetry. Today's exact tidal state. Wind-driven current. Eddy effects near the shore. The number no forecast can give you. — FEATURES — - Set and drift in degrees true and knots - 16-point flow direction (NNE, SSW, etc.) - Smart GPS for stable, accurate readings - Live GPS reception monitoring - Session trend tracking - Automatic slack tide detection - High-contrast interface designed for direct sunlight - Large touch targets for use with gloves - Works 100% offline — no cell signal, no WiFi, no data plan - Works anywhere in the world - No account or signup required - One-time purchase — no subscription, ever — BUILT FOR RACING — Every detail in Drift exists because a racing sailor needs it, — ONE-TIME PURCHASE — $4.99. Yours forever. Unlimited readings. All future updates. No subscription, no ads, no hidden anything. Buy it once, use it for every race, every season. Drift is developed by a sailor, for sailors and coaches. It's the racing tool that you've been missing.
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.
Not assessed in a Build Kit yet.
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.