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
Play: Save Videos Watch Later
Your YouTube watch later queue, done right
$1.49 · In-app purchases
PRICE
$1.49
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
466 ratings · Top 15%
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 included19 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 Play: Save Videos Watch Later: map the core Entertainment 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
Broadened support for various video formats.
Assumption to check: Limited video formats supported
Validate with people who use this workflow before building.
Hypothesis 2
Implement caching and preload strategies.
Assumption to check: Slow video loading times
Validate with people who use this workflow before building.
Hypothesis 3
Add options for sharing saved videos on social media.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create and manage video playlists.
Assumption to check: No option for creating playlists
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
Your YouTube watch later queue, done right. Play is your hub for saving and bookmarking videos, following favorite channels, and watching with powerful customizations. Critically acclaimed by The Verge, Daring Fireball, 9to5Mac, MacStories, Mac Power Users, iMore, AppAdvice, and more. The Verge: “This is so much better than trying to manage a library in the YouTube app” Daring Fireball: “I queue videos from my Mac and iPhone, then watch them later on my TV” MacStories: “Play is an excellent example of how purpose-built apps often outshine more general solutions” AppAdvice: “Play is easy to use and synced across all of your Apple devices” iMore: “You’ll never want to use YouTube’s 'Watch Later' function again” ■ MacStories Selects 2024: Readers’ Choice Award ■ MacStories Selects 2024: Best New Feature Save videos from any app or website to your personal watchlist. Follow YouTube channels and get a chronological subscription feed — free from the algorithm. iCloud keeps your entire video library in sync across your iPhone, iPad, Mac, Apple TV, and Apple Vision Pro. SAVE & BOOKMARK VIDEOS - Add videos to your watchlist from any app using the Share Sheet, drag and drop, or by importing from playlists. - Play automatically fetches metadata — title, channel, duration, and thumbnail — so your queue stays organized. - Supports YouTube, Vimeo, TikTok, Instagram Reels, social posts with embedded video, and more. - Use App Shortcuts to automate adding videos and integrate Play into your workflows. FOLLOW CHANNELS & SUBSCRIBE TO FEEDS * - Follow YouTube channels and playlists and get new videos as they’re released. - Your subscription feed in true chronological order — no algorithm, no recommendations, no noise. - Swipe to save videos to your queue or dismiss them from your inbox. - Organize channels into folders, configure per-channel filters, and hide YouTube Shorts. - Supports channels and creators from YouTube, Vimeo, and Nebula. WATCH WITH POWERFUL CUSTOMIZATIONS - Disable AI auto-dubbing. - Browse, search, and jump through full video transcripts. * - Read AI-generated video summaries. * - Bookmark and annotate key moments in any video. * - Resume playback exactly where you left off. - Watch on Apple TV: save videos throughout the day and watch them on the big screen later. ORGANIZE YOUR COLLECTION - Add notes and a star rating to any video. - Tag videos for better organization, or let Auto-Tagging apply tags automatically based on rules you set. - Use Smart Search to create custom video lists tailored to your preferences. - Use Focus Filters to limit which videos and tags are shown in the app. - Perform bulk actions to manage multiple videos at once. - All features and data are available in the Shortcuts app for custom automations. HOME SCREEN WIDGETS - Add interactive widgets to your Home Screen to view and open saved videos at a glance. - Available in multiple sizes with customizable filters, sorting, and accent colors. Play is a modern app with support for the latest system features. It is also available on the Mac, Apple TV, and Apple Vision Pro as a universal app, so you can enjoy it across iOS, iPadOS, macOS, tvOS, and visionOS with a single purchase. * This feature requires a Play Premium subscription. Privacy Policy: https://marcosatanaka.com/privacy/play.html Terms of Use: https://marcosatanaka.com/terms/play.html
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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
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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.
