Lumi Cleaner: storage cleaner

What it does

Lumi Cleaner is a utility app that helps users reclaim storage space on their iPhones. It scans the user's photo and video library to identify and remove unwanted files. The app specifically targets duplicate photos, blurry images, screenshots, and similar or large video files, organizing them into clear categories for easy management.

Where it shines

Lumi Cleaner excels at making the tedious task of cleaning files feel simple and even engaging. The onboarding (00:07) uses clever animations to demonstrate value before the user commits to anything. Its standout feature is the 'Swipe Clean' mode (02:13), which turns photo sorting into a quick, gamified experience by using a Tinder-like swipe interface to keep or delete photos. The app also provides clear, post-action feedback, showing exactly how much space was saved (01:21), which reinforces the app's value.

UX highlights

Categorized Cleaning: The main dashboard (00:46) neatly organizes clutter into intuitive categories like 'Similar Pic', 'Blur Pic', and 'Screen Pic'. This reduces cognitive load and allows users to tackle cleaning in manageable chunks.
Smart Suggestions: The app automatically identifies the 'Best' photo in a set of duplicates (00:56), simplifying the decision-making process for the user.
Visual Feedback: After every cleaning action, the app presents a clear summary showing the number of files deleted and the amount of space saved (e.g., at 01:21), providing immediate positive reinforcement.
Multiple Sorting Views: Users can clean by category or switch to a chronological view with the 'Swipe Clean' feature (02:13), offering flexibility in how they approach organizing their library.
Action-Oriented UI: Buttons are clearly labeled with actions like 'Clean 48.8MB' (02:58), directly linking the action to its benefit.
Non-destructive Previews: Before committing to a deletion, users can easily review all selected files, which builds trust in the app's suggestions.

Monetization & growth

Monetization is introduced early via a paywall at the end of the short onboarding flow (00:28). The app presents a single subscription offer: a weekly plan with a 3-day free trial. This is a hard paywall, as users cannot access the app's main functionality without first starting the trial. The value proposition on the paywall highlights key pro features like 'Private Vault' and 'No Ads'. After cleaning files, the app also prompts the user for an App Store rating (01:25), a common tactic to boost visibility.

Who it’s for

This app is for anyone who frequently takes photos and videos and finds their phone storage running low. It's particularly useful for users who feel overwhelmed by the prospect of manually sorting through thousands of files. The simple interface and automated suggestions appeal to non-technical users who want a quick and easy solution, while the more detailed sorting features cater to those who want more control over the cleaning process.

Notes & opportunities

While the app is generally well-designed, the immediate App Tracking Transparency (ATT) prompt at 00:01 without any context or warm-up is likely to have a low acceptance rate. A simple warm-up screen explaining why tracking is requested could improve this. Additionally, while the cleaning categories are excellent, the main dashboard (00:46) could feel a bit cluttered with its horizontal scrolling. A more consolidated view might improve navigation for first-time users.