Kernline

Privacy policy

Last updated: 3 November 2026

Kernline is operated by Devson Software, South Africa.

  1. Access. Kernline reads the DOM and computed styles of the tab you invoke it on, only while the inspector is open. Processing happens locally in your browser.
  2. Collected from pages: nothing. We do not record or transmit URLs, browsing history, page content, or files from the page to our servers.
  3. Stored locally. Settings, pixel overlays (images you load), and licence status are saved in extension storage on your device and removed when you uninstall. The licence key you paste is stored in extension storage and sent only to Polar to check your plan.
  4. Optional MCP server, off by default. If you turn on the MCP server in settings and run @kernline/mcp, Kernline sends inspection output from tabs where its panel is open to that server on your own computer (127.0.0.1 only), which passes it to your AI app such as Cursor or Claude. Kernline never sends page content to our servers. Your AI app may send what it reads to its model provider. Turn it off in settings at any time.
  5. Launch list. If you join, Devson Software stores your email address and nothing else, so we can send one confirmation email and one launch email. Unsubscribe from any email, or write to support@kernline.dev to be deleted.
  6. Payments. Pro plans are sold through Polar (merchant of record). If you pay, Polar stores your email and payment details; we see email and plan in the Polar dashboard. Polar does not give us your full card number.
  7. Network calls. When you activate Pro, the extension validates your licence key with Polar at api.polar.sh. Stylesheets and assets on other domains are fetched only after you grant optional host permission for that domain.
  8. No ads, no sale of data, no analytics. The extension has no analytics. This website does not use analytics cookies or a tracking script. We do not use your data for advertising or sell it to data brokers.
  9. Limited Use (Chrome Web Store). Kernline’s use of information received from Google APIs and Chrome Web Store user data complies with the Chrome Web Store User Data Policy, including the Limited Use requirements: data is used only to provide the feature the user invoked; it is not sold; it is not used for ads or creditworthiness decisions unrelated to the extension.
  10. Contact and deletion. Email support@kernline.dev to request deletion of Polar customer data, deletion of a launch-list address, or for questions. Revoke optional site permissions in the extension options page or browser settings.