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
BrowserMask for Safari
BrowserMask is a Safari Extension that lets you browse websites as if you were using another browser by changing the User Agent Safari uses
$3.99
PRICE
$3.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
7 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 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 BrowserMask for Safari: 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
Provide more advanced options for experienced users.
Assumption to check: Limited customization options for privacy settings
Validate with people who use this workflow before building.
Hypothesis 2
Optimize the webview for better performance.
Assumption to check: Performance issues with heavy web pages
Validate with people who use this workflow before building.
Hypothesis 3
Ensure a cohesive design language throughout the app.
Assumption to check: Inconsistent user interface design
Validate with people who use this workflow before building.
Hypothesis 4
Implement onboarding to guide new users through features.
Assumption to check: Lack of clear instructions for new users
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
BrowserMask is a Safari Extension that lets you browse websites as if you were using another browser by changing the User Agent Safari uses. This way, you can make any website believe it’s being shown in a browser like Google Chrome or Microsoft Edge. With BrowserMask, you can choose a global default masked browser or customize it per site. Your settings are saved automatically and applied every time you visit each website. This is especially useful for websites that claim to require another browser but actually work in Safari, or to avoid annoying pop-ups and redirects. For example: • Set macOS Safari as the masked browser on reddit.com in iOS Safari to avoid the “Open in the Reddit app” pop-ups. • Set Microsoft Edge as the masked browser on bing.com to use Bing Chat from Safari. BrowserMask supports macOS, iOS, and iPadOS. Notes: • You can enable the BrowserMask extension from the Extensions section in Safari settings. • BrowserMask includes multiple popular browser User Agents built-in, and you can also add custom ones. • BrowserMask can also be enabled in Web Apps created from Safari on macOS. Privacy by Design: BrowserMask works completely on-device and does not store or send any information outside of the protected app sandbox.
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
Zustand
expo-permissions
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.
