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
Rar Sharp
Rar Sharp is a simple, practical decompression software, can fast, simple and efficient extracting file its easy-to-use interface, personalized settings let you easily office
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.3
64 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 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 Rar Sharp: 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
Expand support to more formats like zip and 7z.
Assumption to check: Limited file format support for compression
Validate with people who use this workflow before building.
Hypothesis 2
Implement a guided tutorial on first launch.
Assumption to check: User interface can be confusing for new users
Validate with people who use this workflow before building.
Hypothesis 3
Optimize file handling and extraction processes.
Assumption to check: Performance issues with large file extractions
Validate with people who use this workflow before building.
Hypothesis 4
Introduce cloud backup for archives.
Assumption to check: No cloud backup 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
Rar Sharp is a simple, practical decompression software, can fast, simple and efficient extracting file its easy-to-use interface, personalized settings let you easily office. Features * Supports to unzip password protected RAR files. * Click to BROWSE images and PREVIEW files inside an archive without extracting. * Supports to decompress selected certain files or parts of one given compressed file * Supports automatic encoding and select the file encoding (default auto-coding) * Supported unzip formats: rar, zip. * Built In-App Purchases supported formats:gzip, tar, cbz, cbr, gz, tgz, bz, bz2 ,tgz2 ,tbz,7z. * Supported compression formats: zip * Transferring files by wifi and iTunes file sharing * Sorting by file name、create time and file type * View, copy, move, delete, rename, email, zip Compression and unzip files/folders * Encryption folder, protect your files * Glide deleting function * Select all and Cancel all operate * Email multiple files, folder Supported * Open email attachments * Photo import Supported * Open files in other applications * Landscape mode supported Rar Sharp for OS X https://itunes.apple.com/cn/app/rar-sharp/id668609870?l=en&mt=12
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
Zustand
React Navigation
expo-file-system
expo-permissions
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.
