DeepLumen AI Visibility Checker Privacy Policy

Effective date: 2026-08-11 · Last updated: 2026-08-11

This Privacy Policy explains how DEEPLUMEN PTE. LTD. ("DeepLumen", "we", "us") handles information in connection with the DeepLumen AI Visibility Checker Chrome extension (the "Extension").

The Extension is a website-audit tool for site owners and marketers. After you click its toolbar icon, it compares the HTML a website returns to a ChatGPT-User-style request against the fully rendered page in your browser, then shows a visibility score and a content-difference report.

Summary: version 1.0 of the Extension performs its analysis entirely on your device. It has no account system, no cookies, no advertising, no analytics, and no DeepLumen server endpoint. It does not send the pages you check, their URLs, or your browsing history to DeepLumen or to any third party.

Our role

For the Extension itself, DeepLumen receives no personal data, so there is no DeepLumen-side processing of your page data to describe: the analysis runs in your browser and the results stay there.

For information you choose to send us directly — for example if you email us a support question — DeepLumen acts as a data controller and uses that information only to answer you.

The operator of any website you choose to check is independently responsible for its own request logs. See "What the website you check can see" below.

When the Extension runs

The Extension runs only when you click its toolbar icon on the tab you want to check.

• It has no permanent host permissions. It cannot read websites you have not explicitly asked it to check.
• It does not install a background content script that runs on every page you visit.
• It does not monitor your browsing between clicks, and it does not read your browser history.

Each click grants temporary access to that one tab, for that one analysis.

What the Extension processes on your device

After you click the Extension, it temporarily processes the following inside Chrome:

• the URL of the current tab;
• the HTML the website returns for the Extension's comparison request;
• the current page's rendered DOM and visible text;
• derived values such as word counts, the visibility score, and the text differences between the two views; and
• your report options, such as whether navigation and footer content should be ignored.

This processing is what produces the report you asked for. None of it is transmitted to DeepLumen or to a third party.

Requests the Extension makes to the website you check

To build the agent-response view, the Extension sends a request to the same page you chose to check. That request:

• uses a ChatGPT-User-style user-agent string;
• omits your cookies and stored login credentials, so it sees the anonymous view a crawler would get;
• is limited to the current page's origin under the temporary permission your click granted; and
• relies on a temporary Chrome request rule that is removed immediately after the request completes.

Additional requests

The Extension has a single scan depth. In addition to the comparison request, every scan requests from the same website up to about 30 further resources:

• /robots.txt (1 request);
• /llms.txt (1 request);
• up to 3 sitemap candidates — the Sitemap: entries declared in robots.txt, or /sitemap.xml if none are declared;
• up to 5 child sitemaps, when a sitemap turns out to be a sitemap index; and
• up to 20 HEAD requests for images referenced by the page, read only for their Content-Length so the report can show image transfer weight.

These requests are same-origin, omit credentials in the same way, and are covered by the same temporary permission your click granted. Their contents are read in your browser and are not transmitted to DeepLumen.

What the website you check can see

Because these requests go to that website, its operator may log them, including the information any website receives when it is contacted: your IP address, the requested URL, the time, and the user-agent string. That website's own privacy policy governs those logs. DeepLumen does not control and does not receive them.

Only check websites you own or are authorised to audit.

Information we do not collect

Version 1.0 does not send the following to DeepLumen or to any DeepLumen-operated service, and DeepLumen does not receive or store it:

• webpage content;
• page URLs or browsing history;
• account, login, or authentication information;
• analytics or telemetry events;
• advertising identifiers;
• precise location information;
• payment or financial information; or
• the score, comparison, summary, or PDF the Extension generates for you.

No accounts, cookies, advertising, or analytics

The Extension does not:

• require or offer an account, sign-in, or subscription;
• set, read, or transmit cookies, and it does not read Chrome's cookie store;
• read localStorage, sessionStorage, saved passwords, or browsing history;
• include any advertising SDK, ad identifier, or ad network;
• include any analytics, product-analytics, crash-reporting, or session-replay service; or
• load remotely hosted code. All executable code is packaged in the Extension and reviewed as part of it.

The Extension's event vocabulary exists in the source as a local, no-op function so that UI code is not coupled to a future analytics choice. It performs no network call and writes nothing off-device.

Local export: PDF and clipboard

The Extension generates output only when you ask for it:

• PDF. A PDF report is created only when you click Download PDF. It is generated in your browser by a PDF library packaged with the Extension and saved by Chrome to your device. It is not uploaded anywhere.
• Clipboard. A text summary is placed on your clipboard only when you click the copy action.

Files you download and clipboard contents you create are under your control and your operating system's control, not ours. If a report contains information you would rather not keep, delete the file or clear your clipboard.

Sensitive page content

When the Extension serialises the rendered page for comparison, it is built to leave out data that is likely to be private. It drops:

• value attributes, so text typed into form fields is not captured;
• srcdoc and nonce attributes;
• any attribute whose name indicates authentication, secret, token, or password data; and
• the contents of textarea elements and editable fields, which are serialised as empty.

HTML comments are also skipped.

Some webpages nonetheless display personal or confidential information as ordinary page text. Such text may be processed locally as part of the comparison, and it may appear in a PDF if you choose to generate one. Do not run the Extension on pages whose contents you are not authorised to process.

No sale or transfer of your data

DeepLumen does not sell your personal information, does not share or transfer it for advertising, cross-context behavioural advertising, or profiling, and does not transfer it to data brokers.

Because the Extension keeps your page data on your device, there is no Extension data for us to disclose to processors, affiliates, or advertising partners.

Data retention

Comparison data lives in the Extension's runtime memory for the page you are analysing. The Extension does not intentionally persist it after you close the report, the page, or the Extension context.

DeepLumen holds no Extension-derived records, so there is no server-side retention period to state. Support emails you send us are retained only as long as needed to handle your request.

Chrome permissions

The Extension requests these Chrome permissions:

• activeTab — grants temporary access to the single tab on which you clicked, on that click only. This is why the Extension needs no permanent access to all websites.
• scripting — injects the packaged analysis script and report interface into that tab after your click. It is not a persistent content script.
• declarativeNetRequestWithHostAccess — applies the comparison user-agent string to the Extension's own request to the current page. The rule is scoped to the current origin and to requests the Extension itself initiates, and it is removed immediately after the request.

The packaged PDF library is declared as a web-accessible resource so the report can load it from a page on any site you choose to check. That declaration lets a page load a file the Extension already ships; it is not a host permission and does not grant ongoing access to websites.

The Extension requests no permanent host permissions.

Security

We limit what the Extension can reach, omit credentials from its requests, avoid a DeepLumen collection endpoint entirely, and ship all executable code inside the Extension package. No software is completely secure, and we cannot guarantee that every third-party webpage you choose to check behaves as expected.

Your choices

You decide when the Extension runs, by clicking its icon; if you do not run it on a page, none of the requests described above are made. You can also close the report without exporting anything, delete downloaded PDFs, clear your clipboard, disable the Extension, or uninstall it from Chrome at any time.

Because version 1.0 sends no personal information to DeepLumen, we generally hold no Extension data to access, correct, port, or delete on your behalf. If you have emailed us, you can ask us to delete that correspondence using the contact details below.

Children's privacy

The Extension is a technical website-audit tool. It is not directed to children, and DeepLumen does not knowingly collect personal information from children through it.

Changes to this policy

We may update this Privacy Policy when the Extension changes or when legal requirements change, and we will update the effective date above.

If a future version introduces an account, cloud analysis, history, synchronisation, or telemetry, we will update this policy and the Chrome Web Store data disclosures before releasing that version.

Contact us

DEEPLUMEN PTE. LTD.
Singapore company registration no. 202542142Z
91 Bencoolen Street, #12-03 Sunshine Plaza, Singapore 189652
Privacy and support: support@deeplumen.io
Website: https://www.deeplumen.com/

This policy is governed by the laws of Singapore.