Introduction

LinkSentinel (the "App") is designed with your privacy as the top priority. This Privacy Policy explains how the App handles information.

This English version is a translation provided for convenience. If there is any discrepancy between this version and the Japanese version, the Japanese version prevails.

Information we collect

The App does not collect any personal information. No account is required, and all mail analysis takes place entirely on your Mac. The developer never receives information that could identify you.

Information the App does not collect

The App never sends the following information anywhere, and the developer never obtains it:

The content of your mail
Sender and recipient information of your mail
Personally identifiable information
Location information
Contacts information
Payment details that directly identify you (such as your name, email address and payment method)

Local processing

All analysis performed by the App runs locally on your device. Mail data and link information are never sent to an external server, and the App never visits the links. Your macOS Contacts are consulted only on the device, and only if you allow it, to check whether a sender is in your Contacts.

Subscriptions and purchase information

Purchases, payments, cancellations and refunds of the App's subscription (including the free trial) are handled by Apple's App Store. The developer does not collect or store purchase or payment information such as your name, email address or payment method. The App communicates with the App Store only to check whether your subscription is active, using the mechanism provided by Apple (StoreKit), and stores the result (subscription status and expiration date) on your device. No mail content or analysis results are sent in this communication. What the developer receives from Apple is limited to anonymized transaction information used to confirm subscription status (such as a transaction ID, the subscription status and period, and the country or region) and aggregated sales reports; this never includes your name, email address or payment method. For how information about App Store purchases is handled, please see Apple's Privacy Policy.

Data storage

The App stores the following information locally on your device:

App settings (notification settings, Verdicts & Actions settings, country and region settings, whether you have completed the getting-started guide and so on)
Trusted Senders (Whitelist), Blocked Senders (Blacklist), Watch Domains (Untrusted Domains) and Per-Sender Links (Per-Sender Whitelist)
Email Analysis History (up to the latest 1,000 messages): sender, recipients, Reply-To and Cc, subject, date, link domains and URLs, sender authentication results, and the verdict and its reasons. Message bodies are not stored. Beyond 1,000 entries, the entries with the oldest message dates are deleted first. You can delete the entire history from the Email Analysis History window.
Senders you have received mail from (used to identify "first-time senders"; recorded per domain, and per address for free-mail services, up to 3,000 entries)
Status (when the extension last responded, when mail was last analyzed, and the number of verdicts that day; shown in the menu and in "Check Setup". It contains no message content)
Subscription status and expiration date (to determine whether your subscription is active)
Your preferences

This data is stored only on your device and is never sent anywhere.

Sharing with third parties

The App does not provide, sell or share your information with third parties.

Security

The App takes the following security measures:

All processing runs locally on the device
Network communication is limited to the App Store, to check your subscription (no communication is made to analyze mail)
Runs in Apple's sandbox environment
Regular security updates

About this website (linksentinel.io)

Analytics (Google Analytics 4)

To understand which pages are viewed and how often, this website uses Google Analytics 4, an analytics service provided by Google LLC. Google Analytics uses cookies (such as _ga) to tell visitors apart with an anonymous identifier, and sends information such as the pages viewed, time on page, approximate region and browser type to Google. This information does not include your name or email address, and Google Analytics 4 does not store IP addresses. Advertising features (Google signals and ad personalization) are turned off, and the collected information is never used to show ads.

For how Google handles this information, see Google's policies and terms. If you prefer not to be measured, install the Google Analytics opt-out add-on.

No tracking other than the analytics described above is performed, and no advertising is served.

Contact form

The name, email address and message you enter in the contact form are used only to reply to your inquiry and for any checks needed to do so, and are never shared with third parties. They reach the developer as an email, are kept for as long as needed to handle the inquiry, and are then deleted. The inquiry email includes a partially masked form of your IP address and your browser type (User-Agent). To prevent abusive submissions, a hashed form of the IP address is used to count submissions over a short period, and the send/reject logs keep a partially masked IP address for a limited period; none of this is used to identify you.

Children's privacy

The App can be used by people of any age (App Store age rating: 4+). Because the App does not collect personal information, no personal information is sent to the developer when a child uses it.

Changes to this Privacy Policy

This Privacy Policy may be updated as needed. We will announce significant changes in the App or on our website. We recommend reviewing this policy periodically.

Contact

If you have questions or comments about this Privacy Policy, please reach us through the contact page.