Kitsmith / Utilities / OnlyOne X
OnlyOne X
Free (Scan & Clean); one-click "Smart check" selection requires upgrading to the pro version — exact Pro price not listed on the developer’s page, check the Mac App Store listing
Price checked at source August 28, 2026.
A free, minimalist duplicate-file scanner from a small indie studio — scan and clean for free, with a pro upgrade for one-click smart selection.
Our take
The bare-bones option in this section: free scanning and cleaning of duplicate files, with configurable minimum file size and ignored file types. The one-click "Smart check" auto-selection is gated behind a pro upgrade. Its developer presence is thin — a single-page site rather than a full marketing site — but the app itself is a real, current Mac App Store listing, last updated in 2025, not an abandoned or fake entry.
- Price
- Free (Scan & Clean); one-click "Smart check" selection requires upgrading to the pro version — exact Pro price not listed on the developer’s page, check the Mac App Store listing
- License
- Proprietary
- Get it via
- Mac App Store
- Developer
- Opproa Tech Studio
Do you use OnlyOne X?
Who made this
Opproa Tech Studio’s own site describes a team of "15 highly skilled software developers" rather than naming an individual maker — no personal name surfaces anywhere in the studio’s own materials.
What it does
Scan & Clean
Free duplicate-file scanning and removal across your Mac.
Configurable scan settings
Set a minimum file size to scan, and choose which file types to ignore.
Smart check (Pro)
One-click selection of all copy items at once, unlocked by upgrading to the pro version.
The deal
Worth knowing: The developer’s web presence is a single minimal page (a Google Sites listing), thinner than other apps in this section — but the App Store listing itself is real, current, and was last updated in 2025.
OnlyOne X — questions people ask
Is OnlyOne X free?
Scan & Clean is free. The one-click "Smart check" bulk-selection feature requires a pro upgrade, per the developer.
Who makes OnlyOne X?
Opproa Tech Studio — the App Store publisher account is listed under the name Kun Liu (坤刘).
Is OnlyOne X free?
OnlyOne X is free to use with optional paid unlocks.
Does OnlyOne X work alongside a notch app like Alcove?
Yes — OnlyOne X lives in the screen, so it runs happily alongside any Dynamic Island hub or notch app.
Where can I download OnlyOne X?
OnlyOne X is available via Mac App Store.
Reviews
No public ratings yet. Reader reviews are coming to Kitsmith soon.
Listing hand-verified August 28, 2026 from the developer's site and public sources.
Also in duplicate finders
Duplicate File Finder
Free (find and remove duplicate files, folders, and similar photos); in-app "Upgrade to Pro" purchase adds duplicate-folder removal, folder merging, and Auto Select — exact Pro price not listed as a static number on this page, check the Mac App Store listingNektony’s free-to-start duplicate and similar-file finder — scans folders, external drives, and Photos/Music libraries, with byte-for-byte comparison and safe Trash-based removal.
Duplicate Photos Fixer Pro
$4.99 one-time (free trial limited to removing 15 photos)Systweak’s dedicated duplicate-photo scanner — adjustable matching levels, Google Drive scanning, and a $4.99 one-time price with a 15-photo free trial.
PhotoSweeper
$14.99 one-time (free trial limited to removing 10 photos)A fast duplicate-and-similar-photo cleaner with deep integration into Apple Photos, Lightroom Classic, and Capture One — Apple Silicon-native, from an independent Mac developer.
Gemini 2
Free trial download; from $1.95/mo to unlock full duplicate removal, per MacPawMacPaw’s well-known duplicate and similar-file finder — a Red Dot Design Award winner with a "learning" selection algorithm, from $1.95/mo.