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
Fast Cleaner - Speed Clean Up
FAST STORAGE CLEANER & MEDIA ORGANIZER
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
1,606 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/
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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 Fast Cleaner - Speed Clean Up: 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
Ensure accurate and clear results after each scan.
Assumption to check: Inconsistent scanning results leading to user confusion
Validate with people who use this workflow before building.
Hypothesis 2
Offer more free features to enhance user experience.
Assumption to check: Limited features without a subscription
Validate with people who use this workflow before building.
Hypothesis 3
Provide an ad-free experience for premium users.
Assumption to check: Ads cluttering the interface
Validate with people who use this workflow before building.
Hypothesis 4
Add tooltips or FAQs to explain results and actions.
Assumption to check: Lack of detailed explanations of clean-up results
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
FAST STORAGE CLEANER & MEDIA ORGANIZER Is your phone storage full? Do you have too many photos and videos cluttering your device? Fast Cleaner is a powerful, professional storage management tool designed to help you organize your gallery and free up valuable space efficiently. With our advanced scanning technology, managing duplicates, similar photos, and large files is simple and fast. KEY FEATURES ►One-Tap Smart Cleaning This is the most efficient way to manage your storage. With just one tap, our Smart Clean feature quickly analyzes your device and executes an immediate cleanup operation. It helps you release mobile space instantly, making storage management simple and hassle-free. ►Delete Duplicate Photos Our algorithm scans your album to identify 100% identical photos. You can remove these unnecessary duplicates with a single click to reclaim wasted storage space. ► Clean Up Similar Photos Intelligently identify similar-looking images, blurred shots, and redundant screenshots. The app helps you distinguish between the best shot and the clutter, allowing you to clean up similar photos easily. ►Swipe to Clean - Fun & Fast Organizing your gallery is now an interactive experience. Use simple gestures to sort through your media: swipe left to discard unwanted photos and swipe right to keep your favorites. It is the most engaging way to reclaim storage space while reviewing your memories. ► Video & Batch Image Compression - Video Compression: Reduce the size of your large video files while maintaining high visual quality. - Batch Image Compression: Quickly resize and optimize multiple photos simultaneously to save storage capacity. ►Calendar Event Cleanup Don't let old appointments clutter your schedule. Whirlwind Clean identifies and removes expired calendar events and past reminders, ensuring your calendar remains clean and up to date. WHY CHOOSE FAST CLEANER? - Fast and Accurate: Optimized scanning algorithm ensures speed and precision. - Simple Operation: Intuitive user interface for easy management. - Secure & Private: All cleaning and organizing operations are performed locally on your device. Download Fast Cleaner today and enjoy a lighter, more organized phone experience! LEGAL LINKS - Terms of User:https://scannersecure.com/clearclean/privacy - Privacy Policy: https://scannersecure.com/clearclean/user
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
axios
react-navigation
expo-file-system
zustand
BUILD KIT DIFFICULTY
Starter
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.
