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
Crustacean for Lobsters
Stay up-to-date with the latest news and discussions from the Lobsters (https://lobste.rs) community, now in a beautiful and native iOS app.
$1.99 · In-app purchases
PRICE
$1.99
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.
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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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included15 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 Crustacean for Lobsters: map the core News 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
Add comment sections and user discussions
Assumption to check: Low user engagement due to lack of interactivity
Validate with people who use this workflow before building.
Hypothesis 2
Expand topics beyond lobsters to attract a broader audience
Assumption to check: Limited content variety in news topics
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more attractive free trial and promotional offers
Assumption to check: High churn rates from subscription fatigue
Validate with people who use this workflow before building.
Hypothesis 4
Enable users to customize notification settings by topic
Assumption to check: Poor notification management
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
Stay up-to-date with the latest news and discussions from the Lobsters (https://lobste.rs) community, now in a beautiful and native iOS app. Note: This is an unofficial app. Crustacean is not affiliated to Lobsters (https://lobste.rs), but is built with love for the community. Crustacean brings you a seamless reading experience, with a clean design, sleek animations, and a native UI that feels right at home on your iPhone. You can even read previously loaded posts offline, caching ensures that you are not dependent on network connectivity to catch up with your fix of tech news. Designed specifically for Lobsters, Crustacean is the perfect companion for anyone who wants to stay engaged with the community on-the-go. Download Crustacean today and dive into the world of computing news, discussions, and community!
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
Axios
react-navigation
react-query
expo-notifications
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.
