KingKit Favourites privacy policy

Effective date: 15 August 2026

KingKit Favourites is an independent Chrome extension developed by Finn Newick. It adds a personal favourites list, stock and price monitoring, optional Scalemates enrichment, local semantic search and optional Google Drive synchronisation to KingKit.

This policy explains what information the extension handles, why it is needed, where it is stored and the choices available to you. KingKit Favourites is not affiliated with KingKit, Scalemates, Google or Hugging Face.

Summary

• The extension does not contain advertising or analytics.
• The developer does not operate a server that receives your favourites, notes, searches or browsing activity.
• Your data stays in your browser unless you choose a Chrome or Google Drive synchronisation option.
• Data is used only to provide the extension’s user-facing features. It is not sold, used for advertising or used to determine creditworthiness.
• You can export, remove or clear your favourites from the extension.

Information the extension handles

KingKit product information

When you save a product, the extension stores the information needed to display and manage it. This can include the KingKit product URL and identifier, title, image URL, manufacturer, scale, category, condition, current and previous prices, stock notes, the time it was saved, and subsequent price or availability changes.

The extension reads KingKit pages on which it runs so it can place favourite controls over product images and capture the product you choose. If price watching is enabled, it periodically requests saved product pages to identify price and stock changes. It does not create a general record of pages you visit: only saved product URLs and the product data required for these features are retained.

Information you add

The extension stores the notes and collection status you assign to a favourite, such as wanted, bought or built, along with extension preferences and synchronisation state.

Scalemates information

If Scalemates enrichment is enabled, the extension sends a search based on a saved product’s public title and product details to Scalemates. It can store the matched Scalemates URL, release year, topic information and other public kit descriptors. Your notes and local search queries are not included in these requests.

Semantic-search data

The extension creates numerical search vectors from saved product information. These vectors and the searches you type are processed locally in the browser. Search queries and vectors are not sent to the developer or to a remote inference service. The extension may download the semantic model files from Hugging Face when the model is first needed.

Google authentication information

Google Drive synchronisation is optional. If you enable it, Chrome asks you to authorise the extension to use its private Google Drive application-data folder. Chrome supplies a short-lived access token for authorised requests; the extension uses the token in memory and does not store your Google password or the token in its favourites database. The extension does not request your Google profile or email address.

How and where information is stored

You choose the storage mode in the extension:

• This device only: favourites and settings are stored in Chrome’s local extension storage on that device.
• Chrome synchronisation: eligible extension records are stored using Chrome Sync and may be processed by Google so that Chrome can make them available on your signed-in browsers. Larger local search vectors are not synchronised.
• Google Drive synchronisation: favourites and the synchronisation information needed to resolve changes are stored in the extension’s private appDataFolder in your Google Drive account. Other Drive files are neither requested nor accessed.

Normal browser and network information, such as your IP address and request headers, may be received by a service when the extension requests a page or file from that service. Those services process such information under their own terms and privacy policies.

Services the extension communicates with

Depending on the features you use, KingKit Favourites communicates with:

• KingKit, to display product images, save product details and check saved products for price and stock changes;
• Scalemates, to find optional public kit metadata and links;
• Google Chrome services, when you choose Chrome synchronisation;
• Google Drive, when you choose Drive synchronisation; and
• Hugging Face, to download the packaged semantic-search model files when required.

The extension does not send data to the developer, data brokers, advertisers or analytics providers. The developer does not permit people to read your stored data, except where you deliberately share an export or where disclosure is required by law or necessary to address a security issue, abuse or fraud.

Retention and your controls

Favourites remain until you remove them or clear the list. A small number of deleted-record markers can be retained temporarily when synchronisation is enabled so that a deletion can be propagated to another browser. Price and stock history is limited within each favourite rather than being retained indefinitely.

You can:

• remove individual favourites or use the extension’s clear control;
• turn off price watching or Scalemates enrichment;
• change storage mode;
• disconnect Google Drive synchronisation;
• export your list before deleting it; and
• remove the extension’s stored data by uninstalling the extension or by clearing its site/extension data in Chrome. Google Drive application data can also be removed through your Google account or by reconnecting and clearing the synchronised list.

If you have exported a list, that file remains under your control until you delete it.

Security

Requests to supported services use HTTPS. Browser extension storage and Google account security controls are used to protect saved information. No storage system can be guaranteed completely secure, so you should not put passwords, payment details or other sensitive personal information in favourite notes.

Chrome Web Store Limited Use disclosure

The use of information received from Google APIs will adhere to the Chrome Web Store User Data Policy, including the Limited Use requirements.

Changes to this policy

This policy may be updated when the extension’s data practices change. The effective date above will be updated, and material changes will be described in the extension’s release notes or repository.

Contact

For privacy questions or requests, contact Finn Newick through the developer contact shown on the Chrome Web Store listing or use the project’s GitHub issue tracker. Do not put sensitive personal information in a public issue.