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
QuadStream
Watch four streams or videos simultaneously with split screen
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
11 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 included18 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 QuadStream: 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
Focus on partnerships for exclusive content.
Assumption to check: Limited content library compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement robust search and filtering options.
Assumption to check: Lack of advanced search filters
Validate with people who use this workflow before building.
Hypothesis 3
Add offline download functionality.
Assumption to check: No offline mode for downloads
Validate with people who use this workflow before building.
Hypothesis 4
Utilize adaptive bitrate streaming.
Assumption to check: Inconsistent playback quality
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
Watch four streams or videos simultaneously with split screen. Set any of the streams to fullscreen while keeping the other streams running (configurable). Quickly switch between Twitch streams by accessing ongoing streams on Twitch channels with twitch:channel shorthand instead of the full stream URL. Manage your streams or favorites online – check out the stream dashboard at quadstream.tv/stream and the favorites dashboard at quadstream.tv/favorites QuadStream 2.0 brings the legendary tvOS app also for iPadOS and macOS, and 2.1.0 adds support for iOS. New features include a discover menu for finding publicly available streams by country and easier access to the app settings. Main features: • up to four simultaneous streams or videos with split screen • set any of the streams to fullscreen • mute or stop streams separately • videos loop automatically • disconnected streams reconnect automatically • access ongoing Twitch streams with twitch:channel shorthand • remembers stream sources, mute and stop states • add stream sources to favorites list • rename favorite labels in the favorites menu with a favorite list button long press • manage your streams online at quadstream.tv/stream • manage your favorites online at quadstream.tv/favorites • find publicly available streams by country in the discover view The main streaming format is HTTP Live Streaming (HLS) which is supported by all major live streaming services. Note: RTSP, RTMP and RTP protocols are not currently supported. Valid protocols include HTTP and HTTPS. The full list of supported MIME types: application/mp4 application/vnd.apple.mpegurl application/x-mpegurl video/3gpp video/3gpp2 video/avi video/mp4 video/quicktime video/x-m4v audio/3gpp audio/3gpp2 audio/aac audio/aacp audio/aiff audio/AMR audio/basic audio/mp3 audio/mp4 audio/mpeg audio/mpeg3 audio/mpegurl audio/mpg audio/scpls audio/wav audio/wave audio/x-aac audio/x-aiff audio/x-caf audio/x-m4a audio/x-m4b audio/x-m4p audio/x-m4r audio/x-mp3 audio/x-mpeg audio/x-mpeg3 audio/x-mpegurl audio/x-mpg audio/x-scpls audio/x-wav text/vtt
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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
React Native
Expo
Supabase
zustand
react-native-reanimated
expo-av
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.
