Ghostery
Ghostery is a free and open-source browser extension and mobile app that blocks trackers, ads, and cookie consent popups to protect user privacy online. Available for Chrome, Firefox, Safari, Edge, and Opera, it serves approximately seven million monthly active users with tracker identification, ad blocking, and anti-tracking features.
Score generated by AI agents based on publicly cited evidence and reviewed by the project maintainer. Not independently validated.
Score History
Timeline events are AI-curated from public reporting. Score trajectory is derived from documented events.
Ghostery begins as a weekend project by developer David Cancel, quickly acquired by Scott Meyer's Better Advertising Project backed by Warburg Pincus. As a simple tracker-visibility tool with no monetization or data collection, scores are low across the board. However, the Warburg Pincus backing and the acquirer's advertising industry roots plant the seeds of future conflict-of-interest concerns.
Rebranded as Evidon, the company operates a dual business model: selling GhostRank tracking data from opt-in users to advertisers while running the Ghostery privacy extension. Evidon serves 2 billion daily AdChoices compliance icons and licenses its data to ad networks. The structural conflict of interest — a privacy tool owned by an ad-tech company — drives significant increases in algorithmic opacity (D5) and competitive conduct (D8) scores. MIT Technology Review and VentureBeat expose the data-selling model in 2013.
Cliqz acquires Ghostery from Evidon in February 2017, ending the GhostRank data-selling business and investing in anti-tracking technology. The extension goes open source in March 2018 under GPL-3.0. However, the Mozilla/Cliqz Firefox experiment (sending browsing data to Cliqz servers with default opt-in) undermines trust. The GDPR email leak in May 2018, Ghostery Rewards affiliate ads, and Ghostery Insights paid analytics introduce new monetization friction that temporarily offsets the privacy improvements.
Cliqz shuts down in April 2020 (COVID-19 impact, 45 employees affected), but Ghostery survives as an independent GmbH under Jean-Paul Schmetz. The company launches Dawn browser, Midnight VPN, and publishes a Consumer Privacy Bill of Rights. The premium subscription model ($14/month for Midnight, contributor tiers for the extension) creates monetization friction, but the November 2022 transition to a donation-based model and the Never-Consent cookie blocker signal a user-first direction.
Ghostery completed its transformation by removing user accounts entirely in October 2025, making all features free with no paywalls. TrackerDB was open-sourced in 2023, Ghostery 10 achieved Manifest V3 compliance, and the company operates on a donation-based model from its Munich headquarters. The Private Browser discontinuation was the only notable feature removal, offset by the elimination of all monetization friction.
Alternatives
Free, open-source ad blocker with no corporate backing and zero monetization. More comprehensive ad blocking than Ghostery with advanced filter list support. Easy switch: install the extension. Full version requires Firefox or Brave after Chrome's Manifest V3 transition.
Free tracker blocker from the EFF with algorithmic tracker detection, similar to Ghostery's tracker-focused approach. No ads, no monetization, backed by a nonprofit. Easy switch with no account or configuration required.
Commercial ad blocker with a free browser extension and paid system-wide apps. Offers broader blocking coverage than Ghostery including DNS-level filtering. Easy browser extension switch; paid apps add protection across all apps and devices.
Dimensional Breakdown
Summaries below were written by AI agents based on the cited evidence. They are editorial interpretations, not independent research findings.
Dimension History
Timeline (32 events)
Better Advertising Project Acquires Ghostery Extension
Scott Meyer's Better Advertising Project, backed by Warburg Pincus, acquires the Ghostery browser extension from creator David Cancel. The company plans to develop an AdChoices compliance system for the online advertising industry while operating the consumer privacy tool.
Better Advertising Rebrands as Evidon
The Better Advertising Project rebrands as Evidon, Inc., a variation of the word 'evident.' The company positions itself as an enterprise marketing analytics and compliance provider, with the Ghostery consumer extension as one arm of a dual business model serving both privacy-conscious users and the advertising industry.
Evidon Launches Global Tracker Report Using Ghostery Data
Evidon publishes the first Global Tracker Report, powered by Ghostery's visibility across over 8 million worldwide domains. The report reveals that Google Analytics and AdSense track over 70% of all unique domains. The data is derived from Ghostery users who opted into the GhostRank data-sharing feature.
Evidon Serving 2 Billion Daily AdChoices Icons
Evidon announces it serves 2 billion daily AdChoices icons worldwide, making it one of two companies licensed by the Digital Advertising Alliance to deliver the self-regulatory compliance program. AdChoices licenses account for approximately 45% of Evidon's enterprise business, deepening the structural conflict between the privacy extension and ad-industry compliance work.
MIT Technology Review Exposes GhostRank Data-Selling Model
MIT Technology Review publishes an investigation revealing that Evidon helps ad companies improve their tracking code by selling them data collected from the eight million Ghostery users who enabled GhostRank. Privacy advocate Jonathan Mayer argues Evidon has 'a financial incentive to discourage alternatives like Do Not Track.' The report brings widespread public attention to Ghostery's dual role.
VentureBeat Reports on Ghostery Ad Industry Assistance
VentureBeat publishes a complementary report highlighting that Ghostery's parent company Evidon takes data from opt-in users and sells it to the very companies Ghostery users are blocking. The article frames this as a fundamental tension: 'a web tracking blocker that actually helps the ad industry.'
Edward Snowden Recommends Ghostery at SXSW
At SXSW in March 2014, NSA whistleblower Edward Snowden publicly recommends Ghostery alongside TOR and NoScript as tools to protect online privacy. The endorsement significantly boosts Ghostery's profile and user growth, though critics later note the irony given Evidon's data-selling business model.
Evidon Rebrands as Ghostery Inc., Unifies Consumer and Enterprise
Evidon rebrands as Ghostery, Inc. in April 2014, unifying its consumer privacy extension and enterprise marketing cloud management under a single brand. The company frames this as 'Transparency For All' but critics note it consolidates the ad-tech compliance business with the privacy tool under one identity.
AdExchanger Questions Ghostery Conflict of Interest
AdExchanger publishes a detailed investigation asking whether a conflict of interest haunts Ghostery's business model. The article highlights that Ghostery works with ad tech vendors to serve the AdChoices icon as a compliance provider while simultaneously making a browser extension that blocks tracking, calling the dual role 'playing both ends against the middle.'
Ghostery 6.0 Launches with Redesigned Interface
Ghostery releases version 6.0 for Firefox with a redesigned interface, categorizing 2,000+ trackers into eight categories (advertising, social media, comments, etc.). The update introduces user accounts and syncing capabilities. The release signals continued product investment despite the ongoing controversy around the business model.
Mozilla Makes Strategic Investment in Cliqz
Mozilla announces a strategic minority investment in Cliqz GmbH, the Munich-based privacy browser company majority-owned by Hubert Burda Media. The investment aims to enable innovation in privacy-focused search. Six months later, Cliqz will acquire Ghostery.
Cliqz Acquires Ghostery Consumer Business from Evidon
Cliqz GmbH, majority-owned by Hubert Burda Media with Mozilla as a minority investor, acquires Ghostery's consumer browser extension and mobile apps from Evidon in an all-cash deal. The remaining Evidon B2B digital governance business continues separately. Ghostery gains approximately 8 million active users. The acquisition ends the GhostRank data-selling model and severs Ghostery's ties to the ad-tech compliance industry.
Evidon B2B Business Acquired by K1-Backed Crownpeak
K1 Investment Management invests over $100 million to acquire Evidon and merge it into Crownpeak, forming a digital experience management company. The acquisition completes the separation of Ghostery's original corporate parent from the consumer extension, which is now fully owned by Cliqz.
Mozilla Bundles Cliqz Data Collection in Firefox for German Users
Mozilla announces a test in which approximately 1% of users downloading Firefox in Germany receive a version with Cliqz software preinstalled. The feature sends browsing activity to Cliqz servers by default, including URLs of visited pages and text typed in the address bar. Users must actively opt out. The experiment sparks significant privacy backlash, implicating Ghostery's parent company in opaque data collection.
Ghostery 8 Launches with AI-Powered Anti-Tracking
Cliqz releases Ghostery 8.0 for Chrome, Firefox, and Opera. The major rewrite integrates Cliqz's heuristic anti-tracking technology alongside traditional blocklists, using AI to dynamically detect trackers in real-time. The 'Enhanced Antitracking Protection' can overwrite identifiable data passed to third parties even when trackers aren't in the blocklist.
Ghostery Goes Open Source Under GPL-3.0
Ghostery publishes the full source code of its browser extensions on GitHub under the GPL-3.0 license, shifting to an open-source development model. The move aims to rebuild trust after years of opacity under Evidon. Cliqz's Marc Al-Hames states Evidon's business model 'was hard to understand and lent itself to conspiracy theories.' The new monetization plan includes Ghostery Insights (paid analytics) and Ghostery Rewards (affiliate marketing).
Ghostery GDPR Email Leaks Hundreds of User Addresses
On GDPR enforcement day (May 25, 2018), Ghostery sends GDPR notification emails that expose recipients' email addresses in batches of 500 users each, with all addresses visible in the 'To' field. The ironic GDPR violation by a privacy company is caused by an operator error on their new self-hosted email platform. Ghostery reports the incident as mandated by GDPR.
Ghostery Rewards Introduces In-Extension Affiliate Ads
With version 8.2, Ghostery introduces the Ghostery Rewards program, an affiliate marketing system that shows users opt-in advertisements for product deals within the extension. Director of Product Jeremy Tillman describes it as '100 percent conversion based.' The feature creates tension for a privacy-focused tool showing ads, though participation is optional.
Ghostery Revamps Mobile Privacy Browsers for iOS and Android
Ghostery launches significantly updated mobile browsers for iOS and Android, the first major mobile update in several years. The browsers integrate Cliqz's private search engine and AI-powered anti-tracking. The Android version adds 'smart blocking' for improved page performance. Available in 14 languages.
Ghostery Midnight Desktop VPN and Tracker Blocker Launches
Ghostery launches Midnight, a desktop privacy suite at $14/month featuring a VPN, system-wide ad blocker, and tracker blocking across all applications (not just browsers). The app blocks 4,500 trackers from over 2,600 companies. Servers available in six locations: Montreal, Frankfurt, Singapore, London, Atlanta, and Los Angeles.
Cliqz Announces Shutdown, Ghostery Continues as Independent Subsidiary
Cliqz GmbH announces it will shut down its browser and search engine, citing the COVID-19 pandemic and stalled European digital infrastructure initiatives. The restructuring affects 45 employees of majority investor Hubert Burda Media. Ghostery, headed by Jeremy Tillman, continues as a 100% Cliqz subsidiary, retaining Cliqz's anti-tracking expertise.
Ghostery Publishes Consumer Privacy Bill of Rights
Ghostery releases a 'Consumer Privacy Bill of Rights' position paper based on consumer research, arguing that privacy is a human right and that personal data should not be used without consent or payment. The publication signals Ghostery's shift toward privacy advocacy under its new independent leadership.
Ghostery Dawn Privacy Browser Enters Beta Testing
Ghostery begins testing Dawn (later renamed Ghostery Private Browser), a Firefox-based desktop browser with built-in Ghostery extension features. Internal testing claims websites load 3-4x faster than Chrome and 1.34x faster than Firefox. The browser is designed for users who want privacy protection without configuring extensions.
Jeremy Tillman Departs as Ghostery President
Jeremy Tillman, who served as President, Head of Product & Marketing at Ghostery, announces his departure in September 2021. Tillman had led the product through the Evidon, Cliqz, and independence transitions. Jean-Paul Schmetz (Cliqz co-founder) continues leading the company as CEO.
Never-Consent Cookie Popup Blocker Launches
Ghostery releases Never-Consent in version 9.6.0, an automated cookie consent management feature that auto-rejects tracking cookies and blocks intrusive cookie consent dialogs. The feature rolls out across Opera, Edge, and other browsers, eliminating a major source of browsing friction for users.
Ghostery Sunsets Premium Subscriptions for Donation Model
Ghostery sunsets its Premium Subscription revenue model in November 2022, transitioning to a donation-based Community Contribution program. Users can support via financial contributions ($1.99-$11.99/month) or through bug reports and content sharing. All core privacy features remain free. The move eliminates the paywall on advanced features like historical tracker analytics.
TrackerDB Open-Sourced Under CC-BY-NC-SA-4.0
Ghostery open-sources its proprietary Tracker Database (TrackerDB) on GitHub under a CC-BY-NC-SA-4.0 license, making it free for non-commercial use by universities, journalists, and privacy researchers. The database catalogs thousands of trackers with metadata about the entities behind them, their categories, and their website URLs.
Ghostery 10 Launches as Complete MV3 Rewrite
Ghostery releases version 10, a complete codebase rewrite that took two years of development, achieving full Manifest V3 compliance across all Chromium platforms. While MV3 reduces blocking effectiveness from ~100% to ~75% on Chrome due to Google's API restrictions, Ghostery maintains functionality on all major browsers including Chrome, Firefox, Safari, Opera, and Edge.
CEO Schmetz Argues Regulation Cannot Replace Privacy Tools
In a TechCrunch interview, Ghostery CEO Jean-Paul Schmetz argues that individual privacy tools are more effective than regulations like GDPR at protecting users from ad trackers. He states that 'regulation won't save us' and advocates for user empowerment through technology rather than legislative compliance, positioning Ghostery as a necessary complement to insufficient regulation.
Ghostery Celebrates 15th Anniversary with 100M+ Downloads
Ghostery marks its 15th anniversary, reporting over 100 million total downloads and 7 million monthly active users. The company highlights its full privacy suite including the extension, Private Browser, Private Search, and the Privacy Digest newsletter, operating as a 23-person team with $5.5 million in annual revenue.
Ghostery Private Browser Discontinued
Ghostery announces the discontinuation of its Private Browser (formerly Dawn), a Firefox-based desktop and mobile browser launched in 2021. The company argues that Safari's support for web extensions since 2022 and Firefox for Android's full add-on support in 2024 make a standalone privacy browser unnecessary, directing users to install the extension in their existing browser instead.
Ghostery Removes All User Accounts and Paywalls
Ghostery permanently deletes all user accounts effective October 1, 2025, making every feature completely free with no login, no paywalls, and no email address stored. The company eliminates its contributor tier structure entirely. Settings can be synced via file export/import, with encrypted server-side sync planned for the future. The move is unprecedented in the ad-blocking industry.
Evidence (37 citations)
D1: User Value Erosion
D2: Business Customer Exploitation
D3: Shareholder Extraction
D4: Lock-in & Switching Costs
D5: Twiddling & Algorithmic Opacity
D6: Dark Patterns
D7: Advertising & Monetization Pressure
D8: Competitive Conduct
D9: Labor & Governance
D10: Regulatory & Legal Posture
Scoring Log (5 entries)
Stripped for Phase 2 re-enrichment
Added 4 timeline events to fill Era 0 and Era 1 coverage gaps