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
Tide Guide: Charts & Tables
The award winning tide app for Apple Watch, iPhone, iPad and Mac
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
10,322 ratings · Top 15%
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.
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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.
What's included17 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.
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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 Tide Guide: Charts & Tables: map the core Weather workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
The award winning tide app for Apple Watch, iPhone, iPad and Mac. Never miss a tide, sunset, or beautiful day on the water. Tide Guide features tide and marine weather conditions from trusted data providers worldwide. It's beautiful, powerful, and provides easy access to thousands of different tide stations around the world. # Apple Design Award & App Store App of the Year Finalist # Built for Apple Watch Gorgeous full screen charts provide detailed tide and weather conditions. Each chart is dynamic and can switch between other conditions and views with just a tap. # Monthly & Yearly Tide Tables View detailed forecasts for 10 days, and tide tables for the next 12 months. Various display options allow for powerful layout customizations. # Home and Lock Screen Widgets Add beautiful and powerful widgets to your Home Screen or Lock Screen. Tide Guide features an extensive set of widgets, with powerful customization options allow for endless combinations of marine and tide conditions. # Live Activities Use Live Activities to follow the current tide or sunset. There are different options for various “island activities.” Track the current tide, wind direction, solar progress, or lunar phase. # Summary Shortcuts Use Siri or the Shortcuts app to view different summaries of the tide, surf conditions, upcoming forecasts, and more. Ask Siri “Tide Guide Surf Report” to never miss the next swell. # Lunar Calendar Easily track the current lunar phase with a beautiful lunar phase calendar. Explore the altitude and elevation of the moon throughout the day, and view detailed solunar times like nautical dawn, dusk, and more. # Pro Features Many features in the app are free to use, and certain availability varies by region. Widgets, complications, detailed charts, and future table data require an active Pro subscription. Privacy & Terms: https://tideguide.com/privacy https://tideguide.com/terms
Written user reviews are not shown here. Check current App Store reviews >
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 a broader location search feature with user-requested locations.
Assumption to check: Limited locations may not cover user needs
Validate with people who use this workflow before building.
Hypothesis 2
Create an ad-free subscription model for enhanced user experience.
Assumption to check: Ads can be intrusive
Validate with people who use this workflow before building.
Hypothesis 3
Add offline caching of tide data for user convenience.
Assumption to check: Lack of offline access
Validate with people who use this workflow before building.
Hypothesis 4
Simplify UI design and enhance user flow for better navigation.
Assumption to check: Interface can be cluttered
Validate with people who use this workflow before building.
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
axios
zustand
react-navigation
date-fns
BUILD KIT DIFFICULTY
Intermediate
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.
