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
Stube : Offline Music & Videos
stube is your ultimate all-in-one music & video app for enjoying music and videos anytime, anywhere.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
3,634 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 included15 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 Stube : Offline Music & Videos: map the core Music 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
Enhance the download library and improve content sourcing.
Assumption to check: Limited offline content availability
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced sorting and filtering options for playlists.
Assumption to check: Poor playlist organization
Validate with people who use this workflow before building.
Hypothesis 3
Focus on optimizing streaming and download quality control.
Assumption to check: Inconsistent audio quality
Validate with people who use this workflow before building.
Hypothesis 4
Integrate social sharing to enhance user engagement.
Assumption to check: Lack of social sharing features
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
stube is your ultimate all-in-one music & video app for enjoying music and videos anytime, anywhere. with a sleek interface and powerful features, snaptube lets you play and organize your favorite songs and videos with ease. whether you're on the go or relaxing at home, take your media with you uninterrupted. key features: music & video playback stream or play your saved music and videos in a clean, intuitive player. create custom playlists organize your content into personalized playlists for quick access. add to favorites bookmark your top tracks and videos for instant replay. sleep timer set a timer to automatically stop playback while you relax or sleep. auto play related music discover similar songs automatically with our smart autoplay feature. song radio mode turn any song into a radio station with continuous, related music. multiple video qualities choose the resolution that fits your needs and storage. whether you’re commuting, working out, or offline in a no-signal zone — snaptube gives you full control of your media library. terms of use(eula): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ terms of service: https://snaptube.aquilaspace.ltd/tos.html
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
axios
react-navigation
expo-av
react-native-reanimated
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.
