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
VideoSound - Music to Video
"Forget uploading boring old videos and images; now’s the time to start laying down your own background audio and making things a bit more interesting!"
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
369 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 VideoSound - Music to Video: map the core Social Networking 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
Offer more free sounds or a sound discovery feature.
Assumption to check: Limited sound options for free users
Validate with people who use this workflow before building.
Hypothesis 2
Optimize video processing with better algorithms.
Assumption to check: Lagging during video processing
Validate with people who use this workflow before building.
Hypothesis 3
Create a guided tutorial for new users.
Assumption to check: Difficult user onboarding
Validate with people who use this workflow before building.
Hypothesis 4
Integrate more social media platforms for sharing.
Assumption to check: Limited sharing options
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
"Forget uploading boring old videos and images; now’s the time to start laying down your own background audio and making things a bit more interesting!" — appPicker - http://bit.ly/vsnrev Highlight your memories with your favorite songs and let your friends wonder how you did it. Let VideoSound be your secret weapon for creating memorable Instagram, Facebook, and YouTube videos! With VideoSound you can: 1. Add music from iTunes to your videos (one at a time); 2. Attach a song to a single photo and create a photo with music; 3. Create a photo slideshow with dozens of photos and music (in-app purchase). Your resulting videos can then be shared on Instagram,Facebook or sent via Email with a few taps! Bits and Pieces • Mix the Original Video's Soundtrack with Music and a Sound Recording • Preserve the Quality and Aspect Ratio of the Original Video • Photo with Music - Create a Video from a Photo plus a Soundtrack • Photo Slideshow - Create a Slideshow with Music from Your Photos (Pro version) • New beautiful Dark theme! • Share on Instagram, Facebook, or Send via Email • Select the Starting Position and Length for your Video • Option to Select Full HD, HD or VGA Resolution for the Resulting Video • Option to Select the Resulting Video Speed (from 1/4x to 4x) • Individual Volumes for Each Soundtrack • Record Sound with a Built-In Sound Recorder Tool • Select the Starting Position for Your Songs • The Option of Choosing the Cropping Rectangle Position, when Selecting a Photo • Audio Fade-In/Out Effect
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
Supabase
Firebase
@react-navigation/native
@supabase/supabase-js
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.
