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.
ColRegs: Nav Lights & Shapes helps sailors, powerboaters, anglers, skippers, crew and maritime professionals recognise vessels and understand what they are doing, as specified by the International Regulations for Prev...
$3.99 · 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.
Kit ready. Verify your email to download it.
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.
JavaScript is required to complete mailbox verification.
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for ColRegs: Nav Lights & Shapes: map the core Education workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Affiliate link: CloneChart may earn a commission at no extra cost
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 user engagement features
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of offline functionality
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Uninspiring design
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Low ratings due to bugs
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.
ColRegs: Nav Lights & Shapes helps sailors, powerboaters, anglers, skippers, crew and maritime professionals recognise vessels and understand what they are doing, as specified by the International Regulations for Preventing Collisions at Sea (IRPCS/ColRegs). Learn to identify vessels, understand their activities and interpret navigation lights and day shapes with this essential ColRegs reference and revision app. QUICK, PRACTICAL REFERENCE Whether you are on the water or ashore, studying in daylight or identifying a vessel in darkness or poor visibility, the app helps you find the relevant illustration, rule and definition in seconds. • Quick-reference and revision tool • Search across ColRegs, navigation lights, day shapes and study content • Improve your recognition of vessels at night and by day • Supports sailing, boating and maritime training courses • Learn using more than 100 custom-made illustrations • Supports classroom instruction and independent study • Test your recall through interactive quizzes • Visual aide-mémoire when out on the water • Use core reference content without internet connection >>> FULL APP — AD FREE | NO IN-APP PURCHASES | NO SUBSCRIPTION WHAT'S NEW IN THIS VERSION This major update makes ColRegs: Nav Lights & Shapes clearer, faster and easier to use. • Save Favourites • Reorder Favourites • Continue from last page viewed • Detailed search results • Expand full rule only when you need it • New gallery-style viewer • Access additional Safe Skipper online quizzes • Share the app with friends WHAT’S INCLUDED 1. NAVIGATION LIGHTS Study detailed illustrations and descriptions of the lights displayed by different vessels at night or in restricted visibility. Learn to recognise vessel types, their aspect and the activities in which they may be engaged. 2. DAY SHAPES Explore clear illustrations and descriptions of the shapes displayed by vessels during daylight. Use these visual references to identify vessel status and activity more confidently. 3. TEST YOURSELF Check your knowledge using three quizzes featuring multiple combinations of navigation lights and day shapes. Also access an extended selection of online Safe Skipper boating quizzes. 4. COLREGS Consult Part C: Lights and Shapes, Rules 20–31 of the ColRegs, reproduced in full for detailed reference and revision. DESIGNED FOR REFERENCE, LEARNING AND REVISION A sound understanding of the ColRegs is essential for everyone who goes to sea in sailing or powered craft. Candidates preparing for Day Skipper, Boatmaster or Yachtmaster assessments can use the app to reinforce their knowledge and practise identifying vessels quickly. ColRegs: Nav Lights & Shapes: Researched and produced with accuracy and practical learning in mind. Its clear visual approach makes complex combinations of lights and shapes easier to understand and remember. ENDORSED BY THE SAILING AND BOATING COMMUNITY >>> Used by thousands of seafarers across Great Britain, the USA, Australia, France, Canada, New Zealand and more than 50 other countries. “Very easy to use, wish I’d had this when I was doing Day Skipper!” “We run a training centre and these apps are a great aide-mémoire for our students.” “I have just downloaded and am using ColRegs Nav Lights & Shapes app, a brilliant training and reference device.” “I really like the ColRegs part of it and the way you have kept it completely in line with the IRPCS.” “Beautifully produced and very simple to use, a cool learning tool.” “Good app for anyone to use, especially when you are training for Boatmaster, Yachtmaster etc. Much easier than flip cards.” OTHER APPS IN THIS SERIES • ColRegs: Rules of the Road covers the Steering and Sailing Rules and Sound and Light Signals sections of the IRPCS. • IALA Buoys & Lights covers both IALA Maritime Buoyage Systems A and B. Improve your knowledge, test your recognition skills and keep essential ColRegs information close at hand with Nav Lights & Shapes.
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.