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
Hard Disk - Monitor Disk Usage
Want to see how much free space you have left on your storage? See today's current free space on your internal drive at a glance from your iPhone with the help of a simple app
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
29 ratings · Top 30%
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 included16 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 Hard Disk - Monitor Disk Usage: map the core Utilities 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
Implement background refresh for real-time monitoring.
Assumption to check: Lack of real-time updates
Validate with people who use this workflow before building.
Hypothesis 2
Provide more granular details on usage by file types.
Assumption to check: Limited detail on disk usage breakdown
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to export disk usage reports in various formats.
Assumption to check: No export options for data
Validate with people who use this workflow before building.
Hypothesis 4
Implement dark mode for better usability in low-light conditions.
Assumption to check: No dark mode support
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
Want to see how much free space you have left on your storage? See today's current free space on your internal drive at a glance from your iPhone with the help of a simple app. The Hard Disk app is a handy and informative tool. It also includes an overview of your system information in one app. Plus, it comes with a variety of beautifully designed widgets for your Home Screen and Lock Screen, and it supports both Light Mode and Dark Mode. The monitor disk usage widgets have a prominent place on your screen. You can place a simple widget that displays the text label showing the current free space, used space, and total capacity of your device. And with a progress bar to get a sense of the available spaces. Alternatively, you can place the detailed widget, which displays the total number of photos, videos, music, and unknown files on your current device. Or place the storage utilization widget to see the percentage usage of your total internal storage. You can choose up to 27 widgets to display on your Home Screen, Lock Screen, or in StandBy mode. Place beautifully designed iOS widgets anywhere you like, keeping your storage information always within sight. This useful and premium app works across macOS, iOS, iPadOS, watchOS, tvOS, and visionOS. So what are you waiting for? Get it Now! iPhone app features: ◆ Real-time storage usage preview for your current device ◆ Add widgets on your Home Screen and Lock Screen ◆ Get insights into your iPhone's storage right on your Mac desktop ◆ Customizable background, text, and progress bar colors ◆ Support for Dark Mode The following high-quality widgets are available in this widget bundle: ◆ Shows the progress bar and the label for free, used, and total capacity (in small, medium, inline, circular, rectangle, and corner sizes) ◆ Detailed Usage of your current storage with the device name on top (in small, medium, large, extra large, inline, circular, rectangle, and corner sizes) ◆ Shows the colorful progress bar with the type of files, such as Songs, Photos, Videos, Apps, and Unknown files (in small, medium, large, and extra large sizes) ◆ Percentage Usage of your current storage in the larger font size (in small, medium, inline, circular, rectangle, and corner sizes) ◆ Gauge Usage of your current storage in the gauge (in small and medium sizes) ◆ Dashboard Usage of your current storage (in rectangle size)
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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.
SUGGESTED BUILD STACK
React Native
Expo
Victory Native
React Navigation
AsyncStorage
expo-clipboard
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.
