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Sain
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Native Mac file search & drive management

Find your files.
Free your drives.

Press ⇧⌘F to search your Mac and connected external drives. When a disk won’t eject, see what’s using it, save your work and try again.

Buy and downloadUS$9.99One purchase. Future updates included.

macOS 14+ · Apple silicon

⇧⌘F
Your files, a shortcut away
Interactive demoTry a file name, pinyin or *.pdf
Relevance
产品需求文档-v3.pdf
~/Downloads
Apr 17
2.1 MB
invoice-2026-08.pdf
~/Documents/expenses
Sep 2
148 KB
Project-notes.pdf
/Volumes/Work SSD/Projects
Sep 28
3.2 MB
Demo data · 3 items↩Open　↑↓Select　TabNext control
“Disk is in use”?Inspect, quit and retry ejecting.
↗

01 / FAST FILE SEARCH

Fewer folders to open.
More room to focus.

Skip the folder maze. Press ⇧⌘F and type a few letters. Search results follow along, across your Mac and connected external drives.

Chinese names, pinyin input

Use full pinyin or initials. Search the way you type.

A little more specific

Narrow by type, path, wildcards and exclusions.

Always following your files

The index updates as you create, rename and move.

Explore the search syntax
Pick a query to try it above● ● ●
Keep your hands in the flow.
↑ ↓Select a fileSpaceQuick Look↵Open a file

One search. Files in both places.

On your MacConnected external drive
A drive needs to be indexed first. Enable or disable each drive in Settings.

02 / EXTERNAL DRIVE EJECT & USAGE

Drive still in use?
See who’s holding on.

The copy is finished, but macOS still says the disk is in use. Sain shows visible processes and file paths so you can see what needs to close.

  1. 01

    See what’s using it

    View the processes and file paths on your drive.

  2. 02

    Close with care

    Save your work, then quit supported apps.

  3. 03

    Eject and go

    Retry the normal system eject after releasing files.

Uses normal app termination and system eject. Save your work first. System processes or files still in use may need manual attention.

SainExternal drives● ● ●

Work SSD

Connected
628 GB / 1 TBAPFS
This disk is in use

See which app is still using Work SSD.

Simulated demo. Your files and drives are not accessed.

KyotoInteractive demo
THE WEEKEND EDITKyoto

A little time away.

Autumn walks · October 18
Screenshot 2026-10-09.pngMatched inside the file · Kyoto

GO FURTHER / SEARCH FILE CONTENTS

Forget the name.
Remember the content.

An address in a screenshot. A project name buried in a PDF. Enable content search, then start with the words you remember.

  • Find text and visual labels in images
  • Search PDFs, DOCX, PPTX, XLSX and text files
  • Recognized on your Mac, with no file uploads

Enable in Settings; initial processing takes time. Content search on external drives is enabled separately.

Your files. Your Mac.

Indexing, text recognition and content search happen on your device. Finding a file shouldn’t mean uploading it.

ON YOUR MAC.

SAIN FOR MAC

From finding files to taking your drive home.

From the first file you open to the last drive you unplug.

  • Fast file name search
  • Image and document content search
  • Search connected external drives
  • Inspect drive usage and eject
One purchase. Future updates included.

US$9.99

Billed in USD · Download after payment

Buy and downloadPurchased? Download

macOS 14+ · Apple silicon

GOOD TO KNOW

Files, drives and a few good questions

How does Sain help when a Mac disk won’t eject?

Sain lists the processes and file paths visible with your current permissions. Save your work, confirm quitting supported apps, then retry the normal system eject. System processes or files still in use may need manual attention. Sain does not repair damaged disks or force-eject them.

Which Macs does Sain support?

Sain supports Apple silicon Macs running macOS 14 or later. Once installed, press ⇧⌘F to open the search panel.

Are my files uploaded?

File search, indexing and content recognition run locally without uploading your files. License purchases and app update checks require an internet connection.

What can I search?

Search file names with pinyin, wildcards and query filters. Enable image and document content search in Settings to find text in screenshots, photos, PDFs, Office documents, Markdown and plain-text files.

Can I search a drive after unplugging it?

Search currently supports connected external drives with indexing enabled. Connect a drive to search the files stored on it.

What about unsaved work when quitting an app?

Save your work before confirming. Sain uses normal app termination and system eject operations. If an app is still using the drive or cannot quit normally, you may need to resolve it manually and try again.

Is this a subscription?

Sain is a US$9.99 one-time purchase with future updates included. After payment, you receive a credential for downloads and in-app updates. File name search, content search and external drive management are all included.

How do I install Sain?

Download and unzip Sain, then drag it into Applications. Version 1.0.0 is Developer ID signed but not yet notarized by Apple. On first launch, you may need to select Open Anyway in System Settings → Privacy & Security. Grant file access as requested by the app.