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
Unzip - zip,rar,7z file opener
Unzip is a powerful zip file opener and extractor
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
54,114 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 Unzip - zip,rar,7z file opener: 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
Enhance cloud storage access and integration.
Assumption to check: Limited cloud integration options.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce sorting, renaming, and tagging functionalities.
Assumption to check: Lack of advanced file management features.
Validate with people who use this workflow before building.
Hypothesis 3
Improve extraction reliability and performance.
Assumption to check: Occasional extraction errors with large files.
Validate with people who use this workflow before building.
Hypothesis 4
Add more personalized settings for user experience.
Assumption to check: Limited customization options for user settings.
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
Unzip is a powerful zip file opener and extractor. Easily extracts ZIP, RAR, 7Z, TAR, GZIP, and other archive formats. Supports creating encrypted ZIP files and extracting multi-volume archives. ◆ Create password-protected ZIP files. ◆ Batch compress videos and photos from the photo library ◆ Compress photos and videos from the album into ZIP files. ◆ To extract multi-volume archives: 1) Make sure all parts are in the same folder; 2) Select the first (main) volume to begin extraction. ◆ Supported archive file formats for decompression: ZIP, RAR, 7Z, TAR, GZIP, GZ, BZIP2, LHA, CAB, LZX, BZ2, BIN, LZMA, ZIPX, ISO, ACE, AES, MSI, CBZ, CBR, and more. ◆ Open and View many document types: DOC, Excel, PPT, PDF, TXT, RTF, CHM, EPUB, JPG, GIF, PNG ... ◆ Play videos and audios: mp4,avi,mkv,wma,flv,mov,3gp,m4a,wav,wmv,rmvb ◆ Convert JPG and PNG images to PDF files. ◆ File backup and transfer: - USB transfer via iTunes File Sharing (upload/download files). - WiFi transfer between phone and computer. - Import files and folders from other apps. - Upload to cloud storage:iCloud Drive, Google Drive, Dropbox, OneDrive #Permanent professional version: * Make a one-time purchase and resume purchases anytime, anywhere. #Annual professional version: * Annual auto-renewable subscription, automatic renewal upon expiration. * Payment will be charged to iTunes Account at confirmation of purchase. * Your subscription will automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. * Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's iTunes Account Settings after purchase. Privacy Policy: https://shuyongapp.web.app/privacypolicy.html Terms of Use: https://shuyongapp.web.app/terms.html Contact us: [email protected]
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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.
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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.
