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
Video Merger Pro-music editor
VideoMerger Pro app is a pro version of “Video Merger FREE” app
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.4
66 ratings · Below Average
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/
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 Video Merger Pro-music editor: 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
Ensure robust error handling and user feedback.
Assumption to check: Poor user ratings due to crashing issues.
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced editing tools like transitions and effects.
Assumption to check: Limited editing features compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize app performance for a wider range of devices.
Assumption to check: Inconsistent performance on older devices.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce cloud storage for user projects to prevent data loss.
Assumption to check: No cloud backup for projects.
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
VideoMerger Pro app is a pro version of “Video Merger FREE” app. In this VideoMerger Pro version, you will see lot of extra features compared to our free video merger app. This app can do more than just join multiple videos into one video. In general, with this video merger app, you can do- combining multiple videos, cropping video, adding background music for videos, add background color & Patterns to videos, add Overlays to videos and you can also add lot of effects to videos easily from this application. Key Features of our Pro Video Merger App: * Easily add a lot of different Effects to videos with our “Effects” option on this app * Very simple user interface, easy to understand * Supports Portrait, Landscape and Square orientation Video output * Combine multiple videos right on your device * Add music to your video at a specified time. * You can change the background color of the video * You can also add Patterns to your video * You can add stickers and text to the video at a specified duration. * You can change the video speed * You can add audio to video from the library, default audios and use your files app . * You can Reverse Video * You can trim and cut videos * You can Flip Videos * Save the combined video to your device or share it on any Social networking sites * Crop: Now we added a crop option to our VideoMerger app. You can now crop your video easily. We also provided aspect ratio as well. Steps to Merge videos by adding effects with our Video Merger Pro App: 1. Select orientation of your output video( Landscape , Portrait , Square) 2. Click on the 'Add' button to select videos 3. Select your music from the music library by clicking on the 'Music' button 4. Click on Edit (Pencil icon) to add effects, overlay, or crop the video 5. To watch the preview click on the 'Play' button 6. Share your merged video by clicking on the 'Share' button So now you can combine many videos easily on your mobile just by using our simple video merger app. You not only combine many video clips into one video clip, but you can also add background music for videos, crop the video, and add a lot of effects to the video and thus you can make your video even more awesome. ********* If you would like to check our Free Video Merger app then visit this link: https://itunes.apple.com/app/id880953154
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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
react-navigation
expo-av
Zustand
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.
