Privacy policy

Who we are

Thezis (“we”, “us”) runs thezis.com, an AI writing assistant for research papers and other long-form writing. This policy explains what personal information we collect, why we collect it, who receives it, and the choices you have.

Questions or requests: ghazi@thezis.com.

What we collect

• Account details. Your email address, plus your name and profile picture if you sign in with Google.
• About you as a writer. The education level, field of study, and kind of help you choose when you start, and the writer profile and writing instructions you save.
• Your documents. The text you write, titles, instructions, revision history, citation style, your messages to the writing assistant, and the changes it proposes and you accept or reject.
• Your sources. Files you upload (PDF, Word, text, or Markdown), links and DOIs you add, and the text and details we extract from them or find for you.
• Usage. Which days you write, word counts, milestones such as your first paper, and a record of each AI request: when it ran, which model handled it, its size and cost, and whether it worked.
• Billing. Your plan, subscription status, and invoice dates and amounts. Stripe collects your card details. We never see or store them.
• How you found us. The website or campaign tag that sent you to Thezis, kept in a cookie and saved to your account when you sign up.
• Visit data. Google Analytics records the pages you view, your browser and device type, and your approximate location from your IP address.
• Messages. If you email us, we keep the conversation.

How we use it

• Run Thezis: sign you in, save your work, write with AI, find and cite sources, and export your papers.
• Take payments and manage your subscription.
• Keep Thezis secure, prevent abuse, and enforce free-plan and fair-use limits.
• Answer your questions and fix problems.
• Understand which features work and which ads lead to sign-ups.
• Contact you: sign-in links, receipts, account and support messages, and occasional product emails that include an unsubscribe link.

We do not sell your personal information. We do not use your documents to train AI models.

How the AI features handle your text

When you ask for writing, a revision, a title, a summary, or sources, we send the relevant part of your document, your instructions, your message, and excerpts of your sources to an AI model. We reach models from providers such as Google and Anthropic through Vercel’s AI Gateway. The provider processes that text to return a result, under its own terms.

To find sources, we send search queries based on your topic or a claim in your text to research services: Exa, OpenAlex, Crossref, Semantic Scholar, and PubMed. We do not send your whole document.

Who receives your information

We share information with companies that help us run Thezis. They handle it only to provide their service to us.

• Vercel: hosting and the AI Gateway.
• Cloudflare: private storage for files you upload.
• Our database provider: stores your account and documents.
• Stripe: payments and billing.
• Resend: sends sign-in links and account emails.
• Google: sign-in with Google, Google Analytics, and, if we run ads, Google Ads measurement.
• AI model providers and research services described above.

A small number of Thezis team members can open your documents and activity in an internal admin tool to give support, investigate misuse, and understand how the product is used. We limit this to what the task needs.

We may also share information when the law requires it, to protect people’s safety or our rights, or as part of a sale or merger of Thezis. We would tell you first.

Cookies and browser storage

• Sign-in session. An essential cookie that keeps you signed in.
• Traffic source. A cookie that remembers the site or campaign that sent you to Thezis. It lasts up to 90 days.
• Google Analytics. Cookies that measure visits. You can opt out with the Google Analytics opt-out add-on.
• Browser storage. A draft you start before signing in stays in your browser until you sign in. It does not leave your device until then.

How long we keep it

We keep your documents, sources, and uploaded files until you delete them or delete your account.

To delete your account, open Settings › Account. This permanently deletes your account, documents, and uploaded files, and cancels any subscription first.

We may keep billing and tax records as the law requires. Logs and backups can hold copies for a limited time after deletion.

Your choices and rights

You can export any paper as a Word or PDF file at any time, and edit or delete documents, sources, and files in the app.

To ask for a copy of your information, or to have it corrected or deleted, email ghazi@thezis.com. We reply within 30 days.

If you are in the European Economic Area or the United Kingdom, we process your information to provide the service you asked for, for our legitimate interests in security, improvement, and measuring ads, with your consent where the law requires it, and to meet legal obligations. You can object to or ask us to restrict some processing, and you can complain to your local data protection authority.

We do not sell personal information. Using analytics and ad measurement from Google may count as “sharing” under some US state privacy laws. To opt out, email us or use the Google Analytics opt-out above. We will not treat you differently for using your rights.

Security and where data is processed

We use encryption in transit, private storage for uploaded files, and access controls on accounts and data. No service is perfectly secure. Tell us at once if you notice anything wrong.

Thezis and its providers process information in the United States and other countries. If you use Thezis from elsewhere, your information is transferred there.

Children

Thezis is not for children under 13, and we do not knowingly collect their information. If you believe a child has given us information, email us and we will delete it.

Changes and contact

We will post changes here and update the date above. If a change is significant, we will also tell you in the app or by email.

Contact: ghazi@thezis.com.