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.
GPS Coordinate Converter is an advanced, yet simple to use mobile application designed for converting geographic coordinate formats, and for measuring distance and bearing between coordinates
$8.99 · 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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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 GPS Coordinate Converter: 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: Limited formats for coordinate conversion
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No option to save frequently used coordinates
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: High price point with no free trial
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.
GPS Coordinate Converter is an advanced, yet simple to use mobile application designed for converting geographic coordinate formats, and for measuring distance and bearing between coordinates. Convert ===================== Easily and quickly convert between coordinate formats including decimal degrees, degrees-minutes-seconds, degrees and decimal minutes, UTM, MGRS, ARINC 424, and FMS style coordinates. Measure ===================== The app measures distance and bearing between two coordinates by placing them on a map and tracing a line that follows the curvature of the Earth between them. The distance and bearing information are displayed below the map in Nautical Miles, Nautical Miles UK, Kilometers and Statute Miles. Time zone and postal address are also shown when an internet connection is available. Onboard database ===================== Included is a built-in database useful for finding the coordinate of an airport, heliport, and radio navigation aids, including VOR, VORTAC, NDB, and DME. Bookmarks ===================== Save and recall frequently used coordinates. Specialized Keyboard ===================== We added a new on-screen keyboard built specifically for working with geographic coordinates. This new keyboard will guide and help you avoid common data entry mistakes. Yes, copy and paste works too, and we'll validate and adjust what you paste accordingly. We think you are going to love this new keyboard. It makes it easy to do the right thing, and hard to do the wrong thing. .
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.