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
Lobsterly: Lobster & Dive Maps
Lobster like a pro
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 5.0
1 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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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/
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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 Lobsterly: Lobster & Dive Maps: map the core Navigation workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Streamlined UI with clear icons and labels for easy navigation
Assumption to check: Users often find navigation apps cluttered and hard to use
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline maps and dive site details for better accessibility
Assumption to check: Limited offline capabilities make it hard to use in remote areas
Validate with people who use this workflow before building.
Hypothesis 3
Simplify subscription management and offer clear benefits for each tier
Assumption to check: Complex subscription processes frustrate users
Validate with people who use this workflow before building.
Hypothesis 4
Implement user-generated content and regular updates to ensure accuracy
Assumption to check: Inaccurate or outdated information about dive sites
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
Lobster like a pro. Find proven lobster spots, navigate with GPS charts, track your catch, and know where the no-take zones are - all in one easy to use app, with no subscription. Free • Interactive map with nautical charts, satellite imagery, and real-time GPS navigation • Light and dark modes for any time of day • Lobster no-take zones across Miami-Dade & Monroe Counties • "Lobster Zones" — proven starting areas across South Florida and the Keys • 100+ free waypoints to real lobster spots • Save your own waypoints and spots • 4,500+ public artificial reefs statewide, Pensacola to Key West • Trip log, pre-trip checklist, and lobstering tips for all skill levels • Export waypoints and trip logs as CSV Premium — one-time purchase, no subscription • 3,000+ proven lobster spots from Haulover Inlet to Key West • Precise GPS coordinates across reefs, ledges, rocks, and hardbottom • Spots rated by description and difficulty • Buy all regions, or just the area you dive Built to help you catch your limit, all season long.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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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
react-navigation
axios
react-native-maps
Zustand
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.
