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
Penguin Ship
Penguin Ship is the easiest way to track all your online orders in one place - automatically.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 5.0
28 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 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 Penguin Ship: map the core Business 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
Enhance tracking with real-time updates and detailed shipment history.
Assumption to check: Users often find shipment tracking features lacking detail.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set preferences for notifications and updates.
Assumption to check: Limited customization options for user profiles.
Validate with people who use this workflow before building.
Hypothesis 3
Create a clear tutorial or guide regarding subscription benefits.
Assumption to check: In-app purchases can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 4
Implement robust testing and user feedback loops to resolve bugs quickly.
Assumption to check: Occasional bugs in shipment status updates.
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
Penguin Ship is the easiest way to track all your online orders in one place - automatically. Connect your email and Penguin Ship gets to work. It reads your order confirmation, shipping, and delivery emails from hundreds of retailers and organizes everything into a clean dashboard. No manual entry. No copy-pasting tracking numbers. Just your orders, always up to date. AUTOMATIC ORDER TRACKING Penguin Ship supports every major retailer including, Amazon, Nike, Target, Walmart, Best Buy, Apple, Costco, and thousands more REAL-TIME ALERTS Get notified the moment your order ships, arrives, or gets delivered. No more refreshing your inbox or checking carrier websites. DELIVERY CALENDAR See all your expected deliveries laid out by date so you always know what's coming and when. SPENDING ANALYTICS Understand your shopping habits with a full breakdown of spending by retailer, category, and time period. INVENTORY MANAGEMENT Keep track of everything you own. Penguin Ship builds your inventory automatically as orders are delivered. PACKAGE TRACKING All your tracking numbers in one place. Tap any shipment to see real-time carrier updates. PRIVACY FIRST Penguin Ship only reads order-related emails. Your data stays yours. Whether you shop once a week or every day, Penguin Ship keeps you in the loop - effortlessly. Terms of Use: https://penguinship.com/terms Privacy Policy: https://penguinship.com/privacy
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.
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BUILD KIT DIFFICULTY
Advanced
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.
