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
SponsorBlock for Safari
THIS EXTENSION DOES NOT BLOCK NORMAL YOUTUBE ADS, ONLY SPONSORS INSIDE VIDEOS
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
80 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 included14 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 SponsorBlock 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
Include advanced features for tracking and editing skipped segments.
Assumption to check: Limited functionality for managing skipped segments
Validate with people who use this workflow before building.
Hypothesis 2
Ensure a responsive design that works seamlessly on all screen sizes.
Assumption to check: Inconsistent user experience across devices
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing capabilities to enhance user interaction.
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 4
Provide insights on how often users skip segments for better content understanding.
Assumption to check: Limited analytics on video engagement
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
THIS EXTENSION DOES NOT BLOCK NORMAL YOUTUBE ADS, ONLY SPONSORS INSIDE VIDEOS. Use Adguard along with this extension to block both types. It also only works on the YouTube website, not the YouTube app. Compatibility with the Vinegar extension SponsorBlock lets you skip over sponsors, intros, outros, subscription reminders, and other annoying parts of YouTube videos. SponsorBlock is a crowdsourced browser extension that let's anyone submit the start and end time's of sponsored segments and other segments of YouTube videos. Once one person submits this information, everyone else with this extension will skip right over the sponsored segment. You can also skip over non music sections of music videos. This is open source and the entire database is public. Permission explanations: Access your data for youtube.com, www.youtube-nocookie.com: - Used to modify the YouTube webpage Data usage explanations: "Authentication Information": When you install the extension, it will generate a random "userID" that is used when submitting or voting. This allows you to appear on the leaderboard and helps determine reputation of submissions. With this extension, you will automatically skip YouTube sponsors. More information about how it works: https://sponsor.ajay.app Source code: https://github.com/ajayyy/SponsorBlock Discord: https://discord.gg/QnmVMpU Changelog: https://github.com/ajayyy/SponsorBlock/releases
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.
