Zynk vs Wormhole.app

Wormhole.app and Zynk are both end-to-end encrypted. The difference is the model: Wormhole.app uploads to a 24-hour browser link capped at 10 GB, Zynk sends device-to-device with no limits, and the next send to the same person is one click, no new link.

See Zynk Shares Visit Wormhole.app

No size cap, remembered devices, and a native app behind the link

You send files to the same devices regularly and don't want to generate a new link every time.
You want direct device transfer with no 10 GB cap and no browser tab to keep open during the send.
You want a menu-bar tray with online contacts, conversations, in-app preview, and PDF signing in one app.
You need drop links, share links, and a CLI for scripts and servers.

Feature by feature

Feature by feature, what Zynk does and what Wormhole.app does.

Feature	Zynk	Wormhole.app
Recipient installEven	None for share or drop link recipients.	None. Browser only.
File sizeZynk wins	No file-size cap on direct transfers.	Up to 10 GB.
EncryptionEven	End-to-end encrypted. Only the receiver devices you send to can unlock the file.	AES-GCM in the browser. Decryption key stays in the URL fragment, not sent to the server.
ExpirationZynk wins	Direct transfers never expire. Share and drop links expire on your terms, not after 24 hours.	Files up to 5 GB stored encrypted on Wormhole servers for 24 hours. Files over 5 GB are peer-to-peer and require the sender to keep the page open.
Direct device transferZynk wins	Yes when both sides have Zynk.	Files over 5 GB transfer peer-to-peer from sender's browser. Sender must keep the page open until download finishes.
Remembered devicesZynk wins	Sign in with your phone number. Your devices and contacts stay with you across sessions.	No. Each transfer is a new link with no device memory.
Menu bar and trayZynk wins	Lives in the macOS menu bar and the Windows and Linux system tray. Drop a file onto a contact, paste a message, or see who's online without opening the main window.	A web page.
Finder and share menuZynk wins	Right-click "Send with Zynk" in Finder and Windows Explorer. Send from the iOS, Android, and macOS share menus.	Upload through the browser.
ConversationsZynk wins	Every device and every contact gets its own chat: text messages, emoji reactions, edits, replies, and full history.	No. One link, one transfer, done.
Voice notesZynk wins	Record a voice note with a waveform inside the app and send it like any other file.	No.
In-app previewZynk wins	Optional preview for PDFs, video, audio, images, markdown, and code with syntax highlighting.	Browser-side preview only.
PDF signingZynk wins	Open a PDF, draw or type a signature, send the signed copy back. No third-party portal.	No.
Drop linksZynk wins	Yes. Let others upload to you.	No.
CLIZynk wins	Yes, anywhere you can open a terminal.	No.

Recipient installEven

Zynk: None for share or drop link recipients.
Wormhole.app: None. Browser only.

File sizeZynk wins

Zynk: No file-size cap on direct transfers.
Wormhole.app: Up to 10 GB.

EncryptionEven

Zynk: End-to-end encrypted. Only the receiver devices you send to can unlock the file.
Wormhole.app: AES-GCM in the browser. Decryption key stays in the URL fragment, not sent to the server.

ExpirationZynk wins

Zynk: Direct transfers never expire. Share and drop links expire on your terms, not after 24 hours.
Wormhole.app: Files up to 5 GB stored encrypted on Wormhole servers for 24 hours. Files over 5 GB are peer-to-peer and require the sender to keep the page open.

Direct device transferZynk wins

Zynk: Yes when both sides have Zynk.
Wormhole.app: Files over 5 GB transfer peer-to-peer from sender's browser. Sender must keep the page open until download finishes.

Remembered devicesZynk wins

Zynk: Sign in with your phone number. Your devices and contacts stay with you across sessions.
Wormhole.app: No. Each transfer is a new link with no device memory.

Menu bar and trayZynk wins

Zynk: Lives in the macOS menu bar and the Windows and Linux system tray. Drop a file onto a contact, paste a message, or see who's online without opening the main window.
Wormhole.app: A web page.

Finder and share menuZynk wins

Zynk: Right-click "Send with Zynk" in Finder and Windows Explorer. Send from the iOS, Android, and macOS share menus.
Wormhole.app: Upload through the browser.

ConversationsZynk wins

Zynk: Every device and every contact gets its own chat: text messages, emoji reactions, edits, replies, and full history.
Wormhole.app: No. One link, one transfer, done.

Voice notesZynk wins

Zynk: Record a voice note with a waveform inside the app and send it like any other file.
Wormhole.app: No.

In-app previewZynk wins

Zynk: Optional preview for PDFs, video, audio, images, markdown, and code with syntax highlighting.
Wormhole.app: Browser-side preview only.

PDF signingZynk wins

Zynk: Open a PDF, draw or type a signature, send the signed copy back. No third-party portal.
Wormhole.app: No.

Drop linksZynk wins

Zynk: Yes. Let others upload to you.
Wormhole.app: No.

CLIZynk wins

Zynk: Yes, anywhere you can open a terminal.
Wormhole.app: No.

What we noted

Wormhole.app has a strong browser-side security design: AES-GCM encryption before files leave the browser, decryption keys kept in the URL fragment so the server never sees them, and files up to 5 GB stored encrypted on Wormhole servers for 24 hours so the recipient can download later.
If you just need to hand someone a link they open once in a browser, Wormhole.app's zero-install flow is simpler than asking them to install anything. Zynk's device memory only helps when the same people keep coming back.