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.
Wärtsilä iSailor is an easy-to-use marine and river navigation application for amateur seafarers.
Free · 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 Wärtsilä iSailor: map the core Navigation 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 offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inaccurate location data
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Cluttered user interface
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of features compared to competitors
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.
Wärtsilä iSailor is an easy-to-use marine and river navigation application for amateur seafarers. iSailor provides a clear presentation of navigational information, electronic charts and additional content. TX-97 vector charts supported by iSailor are recognized worldwide as one of the most accurate and reliable sources of navigational information. Chart folios can be purchased and downloaded in the iSailor Chart Store utilizing the standard iTunes Store payment/purchasing procedure. Chart correction service is provided on annual basis via the auto-renewable subscription service. iTunes will charge payment after confirmation of the chart correction purchase. You may manage your subscriptions and turn off the auto-renewal service in the Account Settings. Your subscription will automatically renew unless auto-renewal is turned off at least 24 hours before the end of the subscription period. You can cancel your subscription in the Chart Store any time. All previously purchased chart folios will remain available for you and can be restored from the service via the Chart Restore function. To receive subsequent chart corrections for your purchased charts, you will need to subscribe to the annual updates in the Chart Store. The application works on iPhone and iPad using built-in GPS, NMEA Wi-Fi GPS or an external Bluetooth GPS. Supported devices (iOS version 11 and higher): • iPhone 5S or higher • iPad 5 generation or higher iSailor features: • Positioning system: iOS (Built-In GPS), NMEA GPS or AIS Class B (Option) • AIS Class A NavData interface (Option) • NMEA Heading and Rate-Of-Turn sensors (Option) • NMEA Echo Sounder with a graphical 2D echogram and water temperature sensor (Option) • NMEA Wind Sensor, including True & Relative wind calculation (Option) • NMEA Autopilot interface (Option) • Display of charts, routes, track(s) and user objects • AIS target presentation. Target contours and dimensions (Option) • Internet AIS service (Optional subscription) • Weather service (Optional subscription) • Tides and tidal currents (Optional subscription) • Sailing guides, regional marinas (Optional subscription) • North Up, COG Up, Head Up and Route Up chart orientations • Information on any vector chart objects • Free cursor, Point-To-Point and Own ship referenced ERBL functionality • Monitoring of navigational data: Position, Course (COG) and Speed Over Ground (SOG) • Route creation by the graphic and tabular methods. “Go To” routes. • Waypoint monitoring: Bearing to WP, Distance to WP, XTD, Time-To-Go and ETA • Schedule information: Time-To-Go and ETA to any selected waypoint ahead • Multi-language support • Multi-unit support • Custom track colors • Day and night chart palettes • Alarm monitoring functionality • Route, track and user object: export/import via GPX, KML and KMZ formats • Advanced Logging and Playback function (Option) • User object sharing via Facebook, Twitter, iMessenger, eMail NOTE: Continuous use of the GPS running in the background can dramatically decrease the battery life. Wärtsilä iSailor application may use your location even when it’s not open, which can decrease battery life of the device iSailor EULA: https://www.wartsila.com/docs/default-source/marine-documents/transas/WVL-EULA.pdf iSailor Privacy Notice: https://www.wartsila.com/legal-privacy/privacy Questions? Please contact us at [email protected] Sincerely yours, iSailor Team
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.