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
YouTube
Get the official YouTube app on iPhones and iPads
Free · In-app purchases
OVERALL US RANK
#3
Grossing · all categories
REVENUE (Est)
$6.5M/mo
$3.9M - $9.1M
RATING
★ 4.7
49,038,750 ratings · Top 15%
Evidence scope: #3 is the current overall US Grossing chart position. 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 YouTube: map the core Photo & Video 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
Implement adaptive streaming to ensure optimal playback quality.
Assumption to check: Inconsistent video playback quality across different devices.
Validate with people who use this workflow before building.
Hypothesis 2
Offer an ad-free subscription model with premium features.
Assumption to check: Too many ads interrupt user experience.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance search and recommendation algorithms for better content discovery.
Assumption to check: Difficulties in finding content due to algorithm bias.
Validate with people who use this workflow before building.
Hypothesis 4
Provide robust editing tools within the app for creators.
Assumption to check: Limited editing features for uploaded videos.
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
Get the official YouTube app on iPhones and iPads. See what the world is watching -- from the hottest music videos to what’s popular in gaming, fashion, beauty, news, learning and more. Subscribe to channels you love, create content of your own, share with friends, and watch on any device. Watch and subscribe ● Browse personal recommendations on Home ● See the latest from your favorite channels in Subscriptions ● Look up videos you’ve watched, liked, and saved for later in Library Explore different topics, what’s popular, and on the rise (available in select countries) ● Stay up to date on what’s popular in music, gaming, beauty, news, learning and more ● See what’s trending on YouTube and around the world on Explore ● Learn about the coolest Creators, Gamers, and Artists on the Rise (available in select countries) Connect with the YouTube community ● Keep up with your favorites creators with Posts, Stories, Premieres, and Live streams ● Join the conversation with comments and interact with creators and other community members Create content from your mobile device ● Create or upload your own videos directly in the app ● Engage with your audience in real time with live streaming right from the app Find the experience that fits you and your family (available in select countries) ● Every family has their own approach to online video. Learn about your options: the YouTube Kids app or a new parent supervised experience on YouTube at youtube.com/myfamily Support creators you love with channel memberships (available in select countries) ● Join channels that offer paid monthly memberships and support their work ● Get access to exclusive perks from the channel & become part of their members community ● Stand out in comments and live chats with a loyalty badge next to your username Upgrade to YouTube Premium (available in select countries) ● Watch videos uninterrupted by ads, while using other apps, or when the screen is locked ● Save videos for when you really need them – like when you’re on a plane or commuting ● Get access to YouTube Music Premium as part of your benefits Note: If you subscribe via Apple, payment will be charged to App Store Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Account will be charged for renewal within 24 hours prior to the end of the current period at the rate of the selected plan. Subscriptions and auto-renewal may be managed by going to Account Settings after purchase. YouTube paid service terms: https://www.youtube.com/t/terms_paidservice. Privacy policy: https://www.google.com/policies/privacy
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
Zustand
Axios
React Navigation
Firebase
BUILD KIT DIFFICULTY
Expert
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.
