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.
Introducing Cnav — Precision Barometer, Altimeter, Compass, and Coordinates.
$1.99 · 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 Cnav: 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 offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor user interface responsiveness
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of voice navigation options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No traffic updates
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.
Introducing Cnav — Precision Barometer, Altimeter, Compass, and Coordinates. Get real-time environmental insights right from your device — no internet required. Cnav turns your iPhone into a powerful navigation and atmospheric tool. Measure barometric pressure, track elevation, find your heading, and view precise coordinates with a beautifully minimal design that stays readable in any light. Unlike apps that depend on remote data sources, Cnav reads directly from your device’s sensors to deliver fast, reliable, offline information — perfect for hiking, backcountry trips, sailing, or simply understanding the world around you. Key Features • Barometric Pressure • Real-time readings with smooth updates • Choose your unit: inHg, kPa, or mmHg • Altitude & Elevation • Accurate elevation above sea level • View in meters (m) or feet (ft) • Precision Compass • Minimal, elegant compass design • Responsive needle animations • Coordinates Made Simple • Clear, customizable coordinate display • Unit pickers that stay out of your way • Sun Timer (Daylight Awareness) • At-a-glance information to plan your day outdoors • Beautiful, Adaptive Design • Dynamic backgrounds: day sky, night sky, steampunk, or automatic • Subtle materials and shadows for clarity without clutter • Easy Calibration • One-tap sensor calibration for optimal accuracy • Works Offline • No Wi‑Fi or cellular required — perfect for remote environments Why You’ll Love Cnav A thoughtfully crafted interface that blends elegance with purpose. Semi-transparent materials, refined typography, and fluid motion make every reading easy to read and satisfying to use — whether you’re on a summit ridge or at your desk. Built for hikers, sailors, weather enthusiasts, and anyone who appreciates precise, on-device environmental data. Download Cnav and elevate your journey. Note: Continuous use of GPS and sensor data can decrease battery life. For best results, calibrate your device periodically.
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.