Sonar is a free website tracking checker provided by Dolphin Analytics, with the official website at https://www.dolphinanalytics.co.uk/sonar。它用于从外部扫描网站，检查分析工具与营销标签是否真正正常运行，并输出可操作的跟踪审计结果。
In terms of purpose, Sonar solves common problems in website tracking deployment: whether tags cover all pages, whether they fire repeatedly, whether they fire before visitors make a consent choice, whether events are missing, and whether server-side settings exist. Incomplete or non-compliant tracking can lead to wasted ad spend, unreliable data, and GDPR/PECR-related compliance risks.
Main capabilities include: scanning up to 100 pages, visiting the website like a real visitor's browser; checking whether Google Analytics 4 (GA4) appears on every page and fires only once; checking the Google Tag Manager containers running on the website and what they load; checking pixels from ad platforms such as Meta and Google; checking consent settings—what fires before a visitor's choice and whether the visitor's choice is passed to each tool; checking tag-dependent events page by page; and checking visible signs of server-side settings, such as Meta Conversions API, server-side GA4, and Google tag gateway. Scan results provide a score out of 100, prioritize each issue, and explain the cost of each issue, the score increase after fixing it, and the evidence behind it. An official example shows that fixing a consent-related issue can add 5 points.
How to use it: paste a URL on the page to start scanning, with no login, no installation, and no account permissions required. After the scan is complete, the email address is used only to unlock the full report; form inputs are not recorded. Users can choose to fix it themselves or hand the report to Dolphin Analytics to set up tracking on their behalf; official free guides are also provided for self-fixes. Official response time is stated as one business day, and a 30-minute Google Meet appointment with the founder is offered.
Use cases include: automated preliminary checks of website tracking, quick checks of whether Google Analytics is working, comprehensive verification of GA4/GTM/ad pixels and consent settings, and serving as an automated pre-step for manual tracking audits.
Limitations: Sonar only reports issues that can be proven from an external scan. If something cannot be checked, it is clearly stated and does not lower the score; reports are not written by AI and do not make unsupported inferences. It does not access the website internally, so it can only observe externally visible server-side signs, and server-side settings that are not observed will not be presented as confirmed issues. It differs from Google Tag Assistant—the latter checks Google tags in the user's own browser, onthe pages the user browses, while Sonar scans the entire website externally, covers non-Google pixels, and produces a scored report that can be acted on or handed off. More details such as pricing, whether a paid plan is offered, and the specific scope of platform compatibility are not yet provided in the materials.