AdGuard is a family of commercial content-blocking products (Safari content blocker for iOS, Android and desktop apps, browser extensions, AdGuard DNS, AdGuard VPN) developed by Adguard Software Limited, a company registered in Limassol, Cyprus and incorporated in 2009. Its general privacy policy and per-product privacy notices state that filtering happens locally on the device, that the apps connect to AdGuard servers only for filter updates and license checks, and that the company does not share or sell personal information; the iOS app's own notice lists a narrow data surface (app language and identifier on filter-update checks) and its App Store label reads "Data Not Collected". The wider product line carries more optional telemetry than the iOS blocker: the browser extension and Android app offer opt-in, off-by-default usage analytics and crash reports, and an optional Browsing Security feature sends hash prefixes of visited sites to AdGuard. The iOS app's source is published under GPL-3.0 and Privacy Guides lists it as its Safari content-blocker recommendation. AdGuard self-disclosed a 2018 credential-stuffing attack on its account service (servers not compromised; all passwords reset), and in 2025 its VPN app passed a named-firm (Leviathan Security Group) MASA Level 2 review for Google Play; no independent audit of the content blocker itself was found.
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The App Store listing for AdGuard for iOS (seller: Adguard Software Limited) carries Apple's App Privacy label "Data Not Collected"; Apple notes the information is developer-supplied and not verified by Apple.
AdGuard's iOS-specific privacy notice (dated August 7, 2024) states that DNS filtering runs through a local VPN with no remote connection and no personal or identifying information sent, and that filter-update checks send only the app language and app identifier, which AdGuard does not store but aggregates to count active users.
AdGuard's general privacy policy (August 7, 2024) names Adguard Software Limited as data controller, states the apps filter traffic locally and connect to AdGuard servers only to download filter updates and check license status, and states that users are not required to share personal data and can delete it via their AdGuard account.
The AdGuard for iOS source repository on GitHub (AdguardTeam/AdguardForiOS) publishes the app's code under the GNU General Public License version 3, per its COPYING file, letting anyone inspect the Safari content blocker's actual behavior; the company's other commercial products (VPN apps, desktop apps) are not covered by this claim.
AdGuard's contacts page states that Adguard Software Limited was incorporated on June 1, 2009, develops AdGuard Ad Blocker, AdGuard VPN, and AdGuard DNS, and is located at a named legal address in Limassol, Cyprus; the page names no owners, founders, officers, or investors.
The AdGuard DNS privacy policy (August 6, 2024) states that public AdGuard DNS processes no personal data, that AdGuard keeps an anonymous 24-hour database of requested domains not linkable to users, that none of this is shared with third parties, and that the only information shared is derivative block lists; private (account-based) DNS stores per-user query logs the user can disable or time-limit.
AdGuard's general privacy policy states the company will never disclose, share, or sell user data unless it has consent or is required to by law; the only third parties it names are the payment processors Paddle.com Market Ltd. and PayPro Global, Inc., and it states personal data is stored in AdGuard's own data centre in Frankfurt, Germany.
In a September 20, 2018 blog post, AdGuard disclosed a credential-stuffing attack against AdGuard accounts using email/password pairs leaked from other companies' breaches; it stated its servers were not compromised, that it could not determine which accounts were accessed, and that it reset all users' passwords, tightened password requirements, and added a HaveIBeenPwned check.
AdGuard announced on March 25, 2025 that AdGuard VPN obtained the Google Play "independent security review" badge after a Mobile App Security Assessment (MASA) Level 2 review conducted by Leviathan Security Group; this is a named-firm review of the VPN product for a store badge, with no public report, and it does not cover the content-blocking apps.
Privacy Guides lists AdGuard for iOS on its browser-extensions recommendations page as its content-blocker option for Safari users, describing it as free and open-source and using the native Content Blocker API, and notes that standard Safari content blocking is free while some features are premium.
AdGuard's Android privacy notice (August 4, 2025) states automatic crash reports are sent only if the user opts in at first launch, are stored only on AdGuard's own servers without any third-party crash-reporting service, and are kept for 30 days; the same notice discloses an opt-in, off-by-default technical and interaction telemetry option and a Browsing Security check that sends hash prefixes of visited sites.
AdGuard's browser-extension privacy notice (December 16, 2025) states that technical and interaction data (visited screens, button clicks, device info) is collected only with consent and is disabled by default, that a filter-usage statistics option is likewise off by default, and that if the optional phishing/malware protection is enabled, visited sites are checked against AdGuard's Safe Browsing API by sending hash prefixes.