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
Dark Reader for Safari
Dark Reader is an eye-care Safari extension that enables night mode by creating dark themes for websites on the fly
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
281 ratings · Top 30%
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 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 Dark Reader for Safari: map the core Productivity 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
Allow users to create and save their own themes.
Assumption to check: Limited customization options for themes.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize rendering for faster theme application.
Assumption to check: Can be slow to apply changes on large webpages.
Validate with people who use this workflow before building.
Hypothesis 3
Implement better site-specific adjustments.
Assumption to check: Inconsistent user experience across different sites.
Validate with people who use this workflow before building.
Hypothesis 4
Add offline caching for saved themes.
Assumption to check: No offline support.
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
Dark Reader is an eye-care Safari extension that enables night mode by creating dark themes for websites on the fly. It inverts bright colors to make web pages high contrast and easier to read. Dark Reader integrates seamlessly with system dark mode. Adjust brightness and contrast to match your display and ambient lighting. Enable dark mode on every web page or give websites a sepia tone. Select from multiple color theme presets or create your own by customizing background and text colors. Enable or disable Dark Reader for specific websites, automatically sync with system dark mode, or detect already dark websites and leave them unchanged. Developed by the original creators of Dark Reader. Since 2014, we continuously evolve alongside modern web technologies to deliver fast and reliable dark mode support for people sensitive to bright light. A single purchase includes access to the macOS version (Safari browser) when using the same iCloud account. Dark Reader contains no ads and does not collect user data. Enable Dark Reader in Safari preferences and disable similar extensions to prevent conflicts. Enjoy browsing!
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
Supabase
react-native-webview
@react-navigation/native
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.
