Twinmark privacy policy

Effective 30 October 2026. Twinmark is published by GS VectorShell.

Twinmark is a markdown editor for Windows. It's built to work on your computer: it has no accounts, no advertising, and no analytics or telemetry, and GS VectorShell doesn't receive your documents or anything about how you use the app.

What stays on your computer

• Your documents are files you open and save; Twinmark reads and writes them where you choose.
• Version history and crash recovery: Twinmark keeps earlier versions of the documents you edit, and copies of unsaved changes so they can be recovered after a crash, in your Windows user profile.
• Settings: your preferences, the list of recently opened files, your own templates, and a record of which text the AI assistant wrote (so it can be marked as such), in your Windows user profile.
• API keys for AI providers, if you enter any, are stored in Windows Credential Manager, never in a file.
• Spelling suggestions come from Windows' own spell checker, on your computer.
• Pictures in your documents are shown only from your document's own folder. Opening a document never contacts other websites, and Twinmark doesn't check links online.

You can delete this data at any time, for example by uninstalling Twinmark or removing its folders.

When Twinmark uses the internet

Twinmark connects to the internet only in these cases, each one started by you:

• Downloading an AI model. If you choose to download a model for the assistant in AI Settings, Twinmark downloads it from Hugging Face (huggingface.co). Like any download, Hugging Face sees your computer's IP address and that the request comes from Twinmark. After that, the assistant runs on your computer, and nothing you write leaves it.
• Using a cloud AI provider. The AI assistant is off until you turn it on. If you choose OpenAI or Azure OpenAI as its provider, with your own API key, Twinmark asks for your consent the first time. After that, each time you ask the assistant for something, the text it works on (the selection, or the document and its outline) and your request are sent to that provider and handled under its own terms and privacy policy. Nothing is sent to a provider unless you choose one and agree.
• Buying Twinmark, and its free trial. The Microsoft Store handles the trial, the purchase and the license. Twinmark asks Windows whether it's licensed; Microsoft's privacy statement covers what the Store does.

Microsoft components

Twinmark runs on Windows and uses Microsoft components, such as Microsoft Edge WebView2 to display its editor and the Microsoft Store for licensing. They follow your Windows settings and are covered by the Microsoft Privacy Statement.

This website

This website has no cookies, analytics or scripts. It's hosted on GitHub Pages, and GitHub logs visitors' IP addresses for security, as described in the GitHub General Privacy Statement.

Children

Twinmark isn't directed at children and doesn't knowingly collect any information from anyone.

Changes

If this policy changes, the new version will be published at this address with a new effective date.

Contact

Questions about this policy: ask on the Issues page of this website's repository. Issues are public, so please don't include anything private.