About Empti

Why Empti exists

I built Empti after years of editing YouTube videos off an SSD in my bag. Now my whole library sits in Finder and there’s nothing to carry.

That is the whole idea. Empti is a drive on your Mac that holds your library in the cloud and shows all of it in Finder. Your apps open files from it as they would from any disk, and Empti fetches only the parts they read. The library stays in one place, and nothing has to come with you.

What Empti does

• Your library in Finder. Terabytes of files show up on one drive, called Empti, in the Finder sidebar. They use almost no space on your Mac.
• Files open in place. When an app opens a file, Empti streams just the parts it reads. A 52 GB video starts like a small clip, and there is no import step.
• Encrypted with your key. Files are encrypted on your Mac before they leave it, with a random key that your passphrase locks. We can’t read them.
• The same drive on each of your Macs. Sign in on another Mac and the library is there.
• Share links and teams. Send a link that opens in any browser, or share drives with a team.
• Scripts and agents. The empti command reads and writes the drive without mounting it, on a Mac or a Linux server, so a script or an AI agent can use it too. You can give an agent’s computer a single folder instead of the whole drive.

The homepage shows each of these working.

How it’s built

Empti is a native Mac app written in Swift, with a small service behind it.

The drive

The drive is a file system extension built on Apple’s FSKit, so Finder and every app see a normal disk at /Volumes/Empti. When an app reads part of a file, the drive fetches just that part, decrypts it and hands it over. Recently opened parts are kept on the Mac up to a limit you choose in Settings. Files you mark Keep on this Mac stay there; Free up space sends them back to the cloud.

When you copy a file in, Empti encrypts it and uploads it in parts, and an upload picks up where it left off if Empti quits midway. Once the upload is done, the local copy is removed.

Encryption

Every file is split into 4 MiB chunks, and each chunk is sealed with AES-256-GCM on your Mac. Each file has its own key, derived from a master key. The master key is only ever stored locked with your passphrase, which is how your other Macs open the drive, and a recovery key you save at setup can unlock it too. A chunk that has been changed fails to open on its own, without taking the rest of the file with it.

Share links work the same way: the key sits in the part of the link after #, which browsers never send to a server, and the file is decrypted in the recipient’s browser. Security explains all of this in detail.

Storage and service

Encrypted chunks are stored on Cloudflare R2. A small service on Cloudflare Workers handles accounts, storage limits, teams, share links and billing, which runs through Stripe. It handles encrypted data and the account details it needs, never your passphrase or an unlocked key. Privacy lists what it stores.

Where Empti is now

Empti is launching for Macs with Apple silicon running macOS 26 or later, with two plans, Individual and Teams. Your first plan starts with a 14-day trial with 100 GB. Prices are in the pricing section of the homepage, and the changelog lists what has shipped.

Press kit

Logos, screenshots, a photo of the founder and the facts, free to use when writing about Empti. Please follow the usage notes.

Description

Key facts

Logos

The lockup is the bracket mark with the wordmark. Use the dark version on light backgrounds and the light version on dark ones. SVG files scale to any size; PNGs have transparent backgrounds.

Lockup, for light backgroundsMidnight ink, blue dot

SVGPNG1600 × 497

Lockup, for dark backgroundsLight ink, blue dot

SVGPNG1600 × 497

Stacked lockup, for light backgroundsFor square spaces

SVGPNG1200 × 1064

Stacked lockup, for dark backgroundsFor square spaces

SVGPNG1200 × 1064

Bracket mark, for light backgroundsAn empty array, [ ], for small spaces and avatars

SVGPNG1024 × 1024

Bracket mark, for dark backgroundsAn empty array, [ ], for small spaces and avatars

SVGPNG1024 × 1024

App icon

App iconThe icon the Mac app ships with

PNG1024 × 1024SVG

Colours

Screenshots

Rendered from the app in light mode, at 2×. The panel opens with ⌥ Space from any app.

SearchFind any file on the drive and see where it is

PNG1616 × 1316

Move big filesPick the biggest files on the Mac and move them to Empti

PNG1616 × 1316

Upload activityUploads in progress and the space used on this Mac

PNG1616 × 1316

Get startedThe first steps and drive commands

PNG1616 × 1316

Founder photo

Dylan Tazawa-Lim, founderSquare photo

JPEG1000 × 1000

Usage notes

• Use the files as they are. Don’t recolour, stretch, squash, rotate or outline the mark or the lockup, and don’t add shadows, gradients or other effects.
• Use the dark version on light backgrounds and the light version on dark ones. The blue dot over the i is the only colour; keep it, and don’t colour the brackets.
• Don’t put anything inside the brackets, close the gap between them or swap them for parentheses or braces.
• Leave clear space around the logo: at least the height of the lower-case letters around the lockup, and about a fifth of the mark’s width around the mark on its own.
• Keep the lockup at least 128 px wide. Below that, use the mark on its own, down to 16 px.
• Crop the screenshots if you need to, but please don’t change what they show.
• In text, write the name as Empti.

Press contact

For interviews or anything not here, write to [email protected].