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 Zoom! - Apply Zoom, Crop
Do your videos look boring? Did you forget to use zoom during recording? Want to cut some parts? Use this app to add Zoom effects to existing videos, change aspect ratio, cut unwanted parts, or just crop a video
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
401 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 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 Video Zoom! - Apply Zoom, Crop: 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
Add advanced editing features like filters and transitions.
Assumption to check: Limited features for video editing compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement better error handling and stability.
Assumption to check: Occasional crashes during video processing
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and provide clear tutorials.
Assumption to check: Confusing user interface for new users
Validate with people who use this workflow before building.
Hypothesis 4
Offer more affordable subscription tiers or one-time purchase options.
Assumption to check: High price point for premium 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
Do your videos look boring? Did you forget to use zoom during recording? Want to cut some parts? Use this app to add Zoom effects to existing videos, change aspect ratio, cut unwanted parts, or just crop a video. Use it as a normal app or Video Extension. How to use it: 1. Tap video thumbnail to preview video 2. Tap Edit to open editor 3. Use pinch/drag gestures to add zoom effect. You can do it when video is playing or paused. 4. Tap ‘Scissors’ icon to show Cut and Uncut buttons. Hold ‘Cut’ pressed to cut unwanted scenes. 5. Tap ‘Rectangle’s icon to change aspect ratio 6. Finally tap "Done" and select "Overwrite Original” or "Save As New Video“ to start rendering. Even if you choose "Overwrite" you can revert to original anytime. Features: - Zoom/Pan/Crop existing videos - cut as many unwanted parts as you need - turn device to landscape orientation to open full screen preview in gallery view - revert to original or delete videos by long pressing thumbnail in gallery - select output quality lower or equal to original (4k/1080p/720p) - iOS Photo Library support (no internal library) - recording from Front or Back camera - save zoomed video as a New Clip or Overwrite - Photo Extension support allowing you to quickly launch Video Zoom app from system Photos - interface optimized for all iPhones and iPads
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
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.
