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
Marine Fish Guide
A Fish App for South African Marine Anglers
$9.99 · In-app purchases
PRICE
$9.99
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 included16 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 Marine Fish Guide: map the core Reference 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
Incorporate quizzes or gamification elements to enhance user engagement.
Assumption to check: Limited user interactivity and engagement in reference apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced search and filtering options to improve accessibility.
Assumption to check: Difficulty in finding specific information quickly
Validate with people who use this workflow before building.
Hypothesis 3
Add social media sharing options to allow users to share information easily.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Offer tiered subscriptions with exclusive content to improve revenue.
Assumption to check: Poor monetization options
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
A Fish App for South African Marine Anglers What fish is that? How big does it get? How old does it grow? What is the size limit? If you are a keen angler or spearfisher with an interest in the sea fishes of southern Africa, then this app is for you! This easy-to-use app covers 249 commonly caught marine fish species. It features multiple hi-res images, detailed information on each species, distribution maps, current fishing regulations, a species-specific length/weight calculator and lots more! FEATURES • Hi-res zoomable images and detailed text descriptions for the 249 species. • Length/Weight calculator that can be used by anglers who release their fish but want to know what its weight was. Simply measure the fish before releasing and enter this measurement for the approximate weight. • “Compare” allows you to compare two species on the same screen. • Species lists in English, Afrikaans or Scientific names. • A Fish ID (Smart Search) that allows you to easily find a species by selecting attributes eg. Skin Type, Mouth Type, Tail Shape etc. • A personal list that stores your sightings saved to the device that can then be exported through email. We keep the App updated with the latest information on each species. Please contact us if you find any mistakes or information that requires updating. *Uninstalling the program will result in the loss of your list, it is recommended that you keep your own master list separate from the program.
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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
Supabase
React Navigation
Zustand
React Native Reanimated
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.
