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
MainTube
MainTube is a focused YouTube browser for iPhone and iPad that hides Shorts so you can watch what you actually came for.
$2.99
PRICE
$2.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 MainTube: 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
Focus on a minimalist design with essential features only.
Assumption to check: Users often feel overwhelmed by too many features in productivity apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement a simple interface for setting and tracking recurring tasks.
Assumption to check: Difficulty in managing recurring tasks
Validate with people who use this workflow before building.
Hypothesis 3
Enhance reminder functionality with customizable options.
Assumption to check: Lack of effective reminders and notifications
Validate with people who use this workflow before building.
Hypothesis 4
Offer seamless calendar syncing for better task management.
Assumption to check: Poor integration with calendars
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
MainTube is a focused YouTube browser for iPhone and iPad that hides Shorts so you can watch what you actually came for. Tired of opening YouTube "for one video" and losing 30 minutes to Shorts? MainTube removes the distraction at the source. What it does: • Hides the Shorts tab in the bottom navigation • Removes the Shorts shelf from your home feed • Filters Shorts out of search results • Filters Shorts out of your subscription feed • Keeps long-form videos, channels, playlists, and everything else you love about YouTube Built for focus: • Optional Face ID lock — keep the app (and your attention) protected • Clean, minimal interface with no ads of our own • No account required — sign in with your YouTube account only if you want to • Works on iPhone and iPad Privacy first: • We do not collect, track, or transmit any personal data • No analytics, no ads, no third-party trackers • Your YouTube session stays between you and YouTube Stop scrolling. Start watching. MainTube is an independent app and is not affiliated with, endorsed by, or sponsored by YouTube or Google LLC.
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
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.
