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
Image Size & Video Compressor
Resize
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 ratings · Top 5%
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/
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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 Image Size & Video Compressor: 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
Include more formats like GIF, PNG, etc.
Assumption to check: Limited file format support
Validate with people who use this workflow before building.
Hypothesis 2
Optimize algorithms for faster processing
Assumption to check: Slow compression times
Validate with people who use this workflow before building.
Hypothesis 3
Integrate cloud services for saving media
Assumption to check: No cloud backup options
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate tutorial or onboarding process
Assumption to check: Lack of user instructions
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
Resize. Compress. Repeat. Resizer is the fastest way to adjust dimensions and shrink file sizes on your iPhone. Whether you need exact pixels for social media or more storage space, Resizer handles everything locally with high precision and speed. Key Features Batch Processing: Select dozens of photos or videos at once and export them in a single tap. Precise Resize: Set custom pixel dimensions with aspect-ratio lock or pick from ready-made presets. Social Media Presets: Instant, optimized sizes for Instagram, X, Facebook, YouTube, LinkedIn, Pinterest, and more. Smart Compression: Choose between Light, Balanced, or Strong levels to shrink files without losing visible quality. Smart Filters: Quickly find exactly what you need with filters for Screenshots, Selfies, and Large Photos. Privacy First: Your files never leave your device. Resizer works fully offline with no accounts, no tracking, and zero cloud uploads. The ultimate tool for creators and space-savers.
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
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react-native-slider
expo-file-system
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.
