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
LakeMap
LakeMap puts the world's lakes on your map — from the Caspian Sea to lakes near your own backyard.
$1.99
PRICE
$1.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 LakeMap: map the core Travel 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
LakeMap puts the world's lakes on your map — from the Caspian Sea to lakes near your own backyard. LakeMap lets you explore hundreds of thousands of lakes and reservoirs worldwide, with detailed data for each one: • Surface area, shoreline length, and watershed area • Average depth, total volume, and elevation • Monthly surface temperature charts, month by month • Ice cover duration • Nearby population • Background and history, where available FIND LAKES YOUR WAY Search by name, browse the map, or let LakeMap center on your current location. Zoom out to see lakes cluster by region, or zoom in to explore individual lakes in detail. Covers 346,000+ lakes and reservoirs worldwide, down to 0.5 km² in surface area. FILTER TO WHAT MATTERS Narrow the map down by country, surface area, shoreline length, depth, volume, or elevation to find exactly the kind of lake you're looking for. SAVE YOUR FAVORITES Star any lake to save it to your favorites list for quick access later. SWITCH MAP STYLES View the map in Standard, Satellite, or Hybrid styles to see lakes exactly the way you want. Whether you're planning a trip, researching hydrology, or just curious about the lake down the road, LakeMap gives you the data to explore it. Data sources: HydroLAKES (Messager et al., 2016), LakeTEMP (Korver et al., 2024), LakeATLAS (Lehner et al., 2022), OpenStreetMap contributors, GeoNames.org, and Wikipedia.
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 robust review and ratings system for lakes.
Assumption to check: Lack of detailed lake information and user reviews
Validate with people who use this workflow before building.
Hypothesis 2
Add itinerary suggestions and activity recommendations.
Assumption to check: Limited trip planning features
Validate with people who use this workflow before building.
Hypothesis 3
Introduce in-app messaging for users to coordinate trips.
Assumption to check: No in-app messaging for trip coordination
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to save favorite lakes and trips for easy access.
Assumption to check: No personalization features
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
Supabase
react-navigation
react-native-maps
zustand
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
