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
File Manager Plus
File Manager Plus is a premium file manager app that lets you view and manage files on the go
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
88 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 included20 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 File Manager Plus: map the core Business 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
Integrate more cloud services like OneDrive and iCloud.
Assumption to check: Limited cloud storage options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the layout and improve navigation.
Assumption to check: Cluttered user interface can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Implement powerful search filters and sorting options.
Assumption to check: Lack of advanced file search features
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer explanations of premium features and subscription benefits.
Assumption to check: In-app purchases can be confusing
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
File Manager Plus is a premium file manager app that lets you view and manage files on the go. Extensive file format support, cloud storage connectivity and fluid user experience easily make it your go-to app Features - Cloud and Network Storage - Document Reader - Image Viewer - Music Player - Video Player - Decompress and Compress - Text Editor - Open from Other Apps (Mail Attachments, Safari, etc) - Send To Other Apps (Mail, Open In) - Security with Passcode and Touch ID - Wi-Fi Drive (Web, WebDAV, FTP) - USB Drive through iTunes File Sharing Supported File Types - Office (Word, Excel and PowerPoint) - iWork (Pages, Numbers and Keynote) - PDF and AI - HTML and Web Archives - Images (jpg, png, gif, psd, etc) - Audio (mp3, m4a, wav, caf, etc) - Video (mp4, avi, rmvb, mkv, etc. subtitle: srt, ass, etc) - Archives (zip, rar, 7z, etc with passwords and splits) - Plan Text Files Supported Remote Storage - Dropbox - Google Drive - box - OneDrive - FTP - WebDAV User Experience Enhancements - Long Press Popup Menu for Quick File Operations - Slide Out Menu for Quick Switch between Storage Browsers The screenshots use music Night Owl by Broke For Free under Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) The screenshots use movie Sintel by Blender Foundation under Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
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.
