Terms of Service
Last updated: June 11, 2026
These Terms govern your use of Knock (“the app”), a macOS application provided by 넥스트액션클럽 (NextActionClub) (“we,” “us”). By downloading or using Knock, you agree to these Terms. If you don't agree, please don't use Knock.
1. The service
Knock is a macOS menu-bar app that lets you send notes, doodles, and screen-takeover “Knock” messages to people in your circle — up to five people who share a private invite code. Messages are delivered through our servers to the members of your circle.
2. License & payment
Knock is free to download. Connecting with your circle (sending and receiving) requires a one-time purchase of US$9 — a lifetime unlock, not a subscription. One purchase unlocks the entire circle: the buyer and up to four invited members, who use it for free. Payments are processed by Polar Software Inc. as our Merchant of Record, and your purchase is also subject to Polar's terms.
3. Refunds
Because this is a low-cost, one-time purchase, we handle refunds case by case. If you're not happy, email us at nextactionclubkr@gmail.com within 7 days of purchase and we'll make it right. Refunds are issued through Polar.
4. Acceptable use
You agree not to use Knock to harass, spam, threaten, or send unlawful, abusive, or infringing content, or to reach anyone who has not agreed to be in your circle. Because a Knock can take over someone's screen, only invite people who want to hear from you. We may suspend or remove circles that violate these Terms.
5. Your content
You keep ownership of the messages and doodles you send. You grant us a limited license to store and transmit them solely to deliver them to your circle. Don't send anything you don't have the right to send.
6. Availability & changes
We work hard to keep Knock running, but we provide it “as is,” without warranties of any kind. We may update, change, or discontinue features, and we may update these Terms; material changes will be posted on this page.
7. Limitation of liability
To the maximum extent permitted by law, we are not liable for indirect, incidental, or consequential damages, or for any loss arising from missed, delayed, or undelivered messages. Knock is a convenience tool — not a guaranteed-delivery or emergency service. Please don't rely on it for time-critical or safety-critical communication.
8. Contact
넥스트액션클럽 (NextActionClub) · nextactionclubkr@gmail.com