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
Puffin Browser Pro
Puffin Cloud Browser is the client app that accesses the cloud server which runs the web browser
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.9
1,433 ratings · Below Average
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 Puffin Browser Pro: map the core Utilities 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
Optimize cloud technology for faster loading.
Assumption to check: Slow page loading times compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Enhance stability and error handling.
Assumption to check: Frequent crashes during intensive use
Validate with people who use this workflow before building.
Hypothesis 3
Add more settings for user preferences.
Assumption to check: Limited customization options for users
Validate with people who use this workflow before building.
Hypothesis 4
Implement better support channels and FAQs.
Assumption to check: Poor customer support and response times
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
Puffin Cloud Browser is the client app that accesses the cloud server which runs the web browser. The Puffin client app and the Puffin cloud server do not communicate in HTTP protocol and the data exchange is not in HTML format. The Puffin client app is like the remote desktop client and the Puffin cloud server is like the remote desktop server. Puffin Cloud Browser gives the audience the illusion of a web browser but it is not, in reality, a web browser. Puffin Cloud Browser can only "display" the web content rendered on the cloud servers but can't "render" the web content itself on the client devices. ==== Differentiating Features ==== * Browser Isolation * Cloud Acceleration * Data Saving * Download to Cloud * Flash Game * Full Desktop Mode * Internet Access Protection * Virtual Gamepad/Mouse/Trackpad ==== Important Limitations ==== * Only works on websites that are publicly accessible from the US -- Does not work for private IP, corporate Intranet, and geo-restricted websites * Only works in countries that are not excessive in censorship -- Does not work in China, Iran, Saudi Arabia, and the United Arab Emirates * For some websites, Puffin server IP blocks need to be white-listed -- Puffin can bring an excessive load to some websites More info at Puffin FAQ https://help.puffin.com/faq
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
react-native-webview
react-native-gesture-handler
expo-web-browser
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.
