Sizemac

Privacy

Updated October 14, 2026

Sizemac is a Mac app sold by High5 Labs LLC. It runs on your Mac and moves windows there. It sends nothing about you or your windows to us: there is no analytics, no telemetry, no crash reporting service and no account.

What stays on your Mac

Your settings, your shortcuts, your saved layouts, the Tremor Log and a diagnostic log live in ~/Library/Application Support/Sizemac as plain, readable JSON. The Tremor Log records which window you moved, where, and when. Both logs keep thirty days. Nothing in that folder is transmitted anywhere.

Sizemac uses the macOS Accessibility permission to move and resize windows. It reads a window’s position, size and title in order to move it and to name it in your Tremor Log and layouts. Titles stay on your Mac, and it never reads what is inside a window.

The only times Sizemac uses the network

  1. Your license. When you activate, and each time Sizemac opens with a license, it checks Apple’s CloudKit for a record of a hash of your license key and an opaque Apple identifier for your iCloud account, so the same key works on every Mac signed in to that account and nowhere else. That record holds no email address, no name and nothing about how you use Sizemac. You can release it from the License pane at any time.
  2. The update check. Sizemac asks our update feed whether there is a newer version. The request carries the version you are running and nothing else. It can be turned off in Settings.

Nothing else leaves your Mac. The update check is optional.

Buying

Purchases are handled by Paddle.com Market Limited, the merchant of record. Paddle collects your email address and payment details and handles tax; we receive your email address and an order reference so we can send your license key and answer support. We do not receive your card details. Paddle’s privacy notice covers what they do with it.

Newsletter

If you leave an email address in the newsletter box on this site, we keep it in order to send Sizemac news: new features, product news and the occasional discount. Every one of those emails has an Unsubscribe link that takes you off the list in one click.

Email

If you write to us, we keep the message so we can answer it.

Your choices

Everything Sizemac stores is a file you own. Deleting ~/Library/Application Support/Sizemac removes everything Sizemac keeps there. macOS also holds Sizemac’s preferences file (in ~/Library/Preferences) and one Keychain entry that remembers when the trial began. To have us delete a support email, a newsletter address or your purchase record, write to support@sizemac.app.

Children

Sizemac is not directed at children under 13 and collects nothing from anyone.

Who we are

High5 Labs LLC, 4030 Wake Forest Road, Ste 349, Raleigh, NC 27609, United States. support@sizemac.app.