Tack License Agreement

Effective August 13, 2026 · Piney Ridge Labs

This is the agreement for using Tack. Installing or using it means accepting it. It sits alongside the Terms of Purchase, which cover price and refunds, and the Privacy Policy, which covers what Tack sends and when.

What you get

A personal, non-exclusive licence to install and use Tack on up to 3 Macs you use yourself, for as long as you like. It does not expire, and it is not a subscription. Your licence covers Tack and its updates.

A licence is for one person. A household or a company can buy as many as it needs, but one licence does not cover a team.

What you may not do

• Share, publish, resell or lend your licence key.
• Redistribute Tack itself, modified or not.
• Work around the licensing — patching it out, generating keys, or using a key that was not issued to you.
• Take Tack apart in order to build a competing product from it. Reverse engineering that your local law permits regardless of contract stays permitted; nothing here is meant to override that.
• Remove the copyright or licence notices.

What Tack does to your Mac

Worth knowing before you agree, because it is unusual. Tack needs macOS Accessibility permission, which lets it read window titles and move, resize, show and hide the windows of other applications — that is what grouping is. It also calls undocumented macOS window-server functions, which is the only way to move and layer windows without flicker.

Two consequences follow:

• A macOS update can change or withdraw those functions. When that happens we fix it, but we cannot promise a version of macOS that Tack has never seen will work.
• Tack moves your windows. It remembers where each one was and puts it back, including after a crash — but a tool that moves windows can put one somewhere you did not want it.

Who owns what

Tack is licensed, not sold. Piney Ridge Labs keeps ownership of it. You keep everything of yours — your documents, your windows, your work. Tack claims no rights in anything you use it on.

No warranty

Tack is provided as-is, without warranty of any kind, express or implied, including any implied warranty of merchantability, fitness for a particular purpose, or non-infringement. The 14-day trial is the full product, and it exists so you can find out whether Tack works on your Mac, with your applications, before paying for it.

Limit of liability

Piney Ridge Labs' total liability under this agreement is limited to what you paid for Tack. We are not liable for indirect, incidental, special or consequential damages, or for lost data, lost profits or lost time.

Some places do not allow limits like these. Where the law says one does not hold, it does not, and the rest of this agreement still stands.

Ending it

You can stop using Tack whenever you like; Settings → License → "Deactivate This Mac" frees the slot. A full refund ends the licence. Breaking the terms above ends it too. Ending a licence gives us no claim on anything of yours — delete Tack and that is the end of it.

Third-party software

Tack includes Sparkle, which handles updates, under its own licence. The notices are on the Acknowledgements page.

Changes

If this agreement changes, the version you agreed to keeps applying to the version of Tack you already have. Installing a later update means accepting the agreement as it stands here at that time.

Law

This agreement is governed by the laws of the United States.

Questions about any of this: support@pinyridgelabs.com

Tack · Privacy Policy · Terms of Purchase · Acknowledgements