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.
App Overview
RipCharts
Welcome to RipCharts, an industry leader in satellite fishing maps
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
483 ratings · Top 5%
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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.
Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for RipCharts: map the core Sports 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.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Implement offline caching for surf conditions.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Optimize API calls and use local storage.
Assumption to check: Slow load times for data retrieval
Validate with people who use this workflow before building.
Hypothesis 3
Add user-specific recommendations based on favorite spots.
Assumption to check: Lack of personalized content
Validate with people who use this workflow before building.
Hypothesis 4
Improve onboarding experience with guided tours.
Assumption to check: Difficult navigation for new users
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Welcome to RipCharts, an industry leader in satellite fishing maps. This app is free to download for existing RipCharts Premium subscribers. If you are new to RipCharts, then we allow you to purchase a new RipCharts subscription via an In App Purchase. Please contact us if you have questions or would like a complementary demo The RipCharts mobile app is a powerful tool that enables offshore fishermen to evaluate recent satellite imagery in order to determine favorable fishing conditions. Search for, view, and download maps of near realtime satellite imagery onto your device to take with you offshore. View the latest imagery datasets: Raw SST orbit scans Composite SST (1day, 3day) Multi-Res/Cloud Free SST Sub-Surface SST. 0m, -25m, -50m, -100m 5 day SST forecast models Chlorophyll Chlorophyll/Cloud mashups Chlorophyll composites True Color Altimetry Currents Salinity Bathymetry Map Features: Use the multi touch map to zoom, pan, view waypoints, and overlay additional data layers to gain insight into where the most favorable fishing zones are located. Mapping Tools: Measure distances and headings between points Dynamically customize temp/color ranges on SST maps to identify subtle breaks - powerful feature! Overlay bathymetry, altimetry, currents, and Loran layers Tap the map to receive point information (lat, lon, depth, SST) Popular waypoints and fishing hotspots come pre-loaded Manage your personal waypoints (add, edit, delete) Save imagery to your device for offline/offshore use Show your position and navigate on saved imagery using GPS satellites "Go Here" navigation with bearing, ETA, and speed displays Floater oil rig positions updated twice daily (Gulf of Mexico only)
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
React Navigation
Axios
React Native Reanimated
BUILD KIT DIFFICULTY
Advanced
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.
