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
Phone Storage Cleaner: Free up
◉ Download "Free Up: Storage Cleaner" and start cleaning up your iPhone today
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
73,126 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 Phone Storage Cleaner: Free 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
Implement thorough scanning and cleaning algorithms.
Assumption to check: Users often find junk files are not fully cleaned.
Validate with people who use this workflow before building.
Hypothesis 2
Provide clearer value propositions and limit frequency.
Assumption to check: In-app purchases can be confusing and appear too frequently.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize scanning algorithms for speed.
Assumption to check: Users report slow scanning times on large libraries.
Validate with people who use this workflow before building.
Hypothesis 4
Add onboarding tutorials and tooltips.
Assumption to check: Lack of user guidance on how to use features effectively.
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
◉ Download "Free Up: Storage Cleaner" and start cleaning up your iPhone today. Try for FREE Tired of cluttered photos and duplicate contacts taking up precious space on your iPhone? Download Free Up and try seamless phone cleaning for free. It only takes 5 mins to clean up your iPhone storage. WHAT CAN FREE UP DO? ◉ Delete Similar & Duplicate Photos Free Up comes to your rescue when you want to clear out unnecessary pictures that have piled up on your phone. With our app, you can easily search and delete screenshots, similar or duplicate photos, Live Photos, burst photos. ◉ Organize Contacts Is your contact list a mess with identical or unnamed contacts? Free Up is a real lifesaver for organizing your contacts. Merge, back up, and remove duplicate contacts quickly and effectively. ◉ Remove Junk and Clean Cache Free Up analyzes all applications and helps to remove garbage and clear cache. This process helps to increase the memory capacity of your device. (Coming soon) ◉ Help You Save Battery Life Beyond cleaning up your device, Free Up also takes care of your battery. Check out our Battery section for tips on making your iPhone's charge last longer. ◉ Protect Privacy Free Up not only excels at deleting and organizing but also creates a safe space for your private information. Keep photos and contacts in secret spaces, knowing that your privacy is carefully protected. (coming soon) The phone cleaning process may seem scary and time-consuming, but with Free Up, you won't have to spend hours looking through your photos. Download Free Up now and clean up your iPhone's storage and increase the performance with just a few taps in 5 mins. ------------------------------------------------------------------------------------------------------------------------ Follow us on social: - instagram.com/appfreeup/ - twitter.com/appfreeup ------------------------ Terms of Service: https://www.getfreeup.ai/terms Privacy: https://www.getfreeup.ai/privacy
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
React Navigation
Axios
Redux
react-native-reanimated
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.
