Terms of service

01

The agreement

These Terms of Service (“Terms”) are the contract between you and MATH Keys Inc. (“MATH Keys,” “we,” “us”) for the website at mathkeyboards.com, the cloud Typst and LaTeX editor at app.mathkeyboards.com, and the free MATH Keys Chrome extension.

By creating an account, installing the extension, or using the editor, you agree to these Terms and to the Privacy Policy. If you use MATH Keys for a school, lab, or company, you confirm you have authority to bind that organization.

You must be at least 13. If you are under the age of majority where you live, a parent or guardian must agree on your behalf.

02

What MATH Keys is

The cloud editor lets you write Typst and LaTeX documents in the browser, compile them to PDF on our servers, share them, and collaborate. Free accounts include a limited number of documents; Plus and Pro unlock more of the product as described on the pricing page.

The Chrome extension is a STEM keyboard for pasting equations into other apps (for example Google Docs, Slides, Word, and Gmail). Equation drafts in the extension can stay on your device; that is separate from cloud documents.

Parts of the product may be labeled beta. Beta features can change, pause, or disappear. We will not charge you for a beta feature without a clear paid checkout.

03

Accounts

You need an account for the cloud editor. Keep your login safe. You are responsible for activity on your account, including documents you create and people you invite.

Give us accurate sign-in details. If we reasonably believe an account is compromised, abusive, or created to evade a ban, we may suspend or close it.

04

Your documents and content

You own the documents, files, comments, and other content you put in MATH Keys. These Terms do not transfer that ownership to us.

You grant MATH Keys a limited license to host, copy, compile, convert, transmit, and display that content only as needed to run the product — including PDF compile, format conversion, sharing, collaboration, backups, and support you ask for.

You represent that you have the rights to the content you upload, and that it does not infringe someone else’s copyright, trademark, or privacy. If you share a document, you choose who can view or edit it.

05

Acceptable use

Use MATH Keys for lawful writing, teaching, and research. Do not use it to attack our systems or other people, scrape the service in a way that harms it, reverse-engineer it except where the law allows, or resell access without our written permission.

Do not upload malware, try to bypass plan limits, or store or share content that is illegal, exploitative of minors, or that you do not have the right to use. We may remove content or close accounts that break this rule.

Compile capacity and AI Fix are finite. We may rate-limit or throttle abuse so the service stays usable for everyone.

06

Plans and billing

Paid plans (Plus and Pro) are billed through Stripe. Prices, document limits, conversion quotas, and collaboration seats are listed on the pricing page and can change for future billing periods.

Subscriptions renew until you cancel. Cancel anytime in the billing portal; you keep paid features until the end of the period you already paid for. Unless the law requires otherwise, we do not refund partial months or unused time.

If a payment fails, we may downgrade the account to Free after notice. Taxes may apply. You authorize Stripe to charge the payment method you provide.

07

Chrome extension

The Chrome extension is free. Google’s Chrome Web Store terms also apply to the listing and to how Chrome loads the extension.

We do not claim ownership of equations you paste into Docs or other apps. Uninstall anytime from Chrome. Removing the extension does not delete a cloud-editor account.

08

AI features

Optional features such as AI Fix send compile logs and related snippets to our AI providers so we can suggest repairs. Do not treat those suggestions as professional, academic, or legal advice. You remain responsible for the source you compile and submit.

We do not use your documents to train public models for other customers. If an AI feature cannot run without sending data off our servers, we only do that to provide the feature you asked for.

09

Processors and other services

We use processors to run MATH Keys — including Google Cloud and Firebase, Stripe, PostHog (opt-in analytics and masked recordings), Sentry (errors), and AI providers for Fix. How that data is handled is in the Privacy Policy, not in these Terms.

Contracts we sign with those processors (including a data processing agreement with PostHog) are between MATH Keys and the processor. They are not part of this contract with you, and they do not replace the Privacy Policy.

Links to other sites, Chrome, Google Docs, or payment pages are not under our control. Their terms apply when you leave MATH Keys.

10

Availability and disclaimers

We aim to keep the editor, compile, and extension working, but we do not promise uninterrupted service, a particular compile time, or that every LaTeX or Typst package will succeed. Maintenance, outages, and third-party failures happen.

THE SERVICES ARE PROVIDED “AS IS.” TO THE FULLEST EXTENT THE LAW ALLOWS, WE DISCLAIM IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. Compiled PDFs and AI suggestions may contain errors. Keep your own copies of important work.

11

Limitation of liability

To the fullest extent the law allows, MATH Keys is not liable for lost profits, lost data, indirect, incidental, special, or consequential damages, or for grades, publications, or deadlines that depend on a compile.

Our total liability for a claim relating to the services is limited to the greater of (a) the amount you paid us for MATH Keys in the twelve months before the claim, or (b) fifty US dollars. Some places do not allow these limits; in those places, they apply only as far as the law permits. Nothing here limits liability for fraud or for death or personal injury caused by negligence where that cannot be limited.

12

Ending the account

You may stop using MATH Keys and delete your account. We may suspend or close an account that breaks these Terms, goes unpaid, or creates a legal or security risk, after notice when it is reasonable to give one.

When an account closes, your license to the paid product ends. We may delete documents after a short retention window unless the law requires us to keep them. Clauses that should survive — including your content representations, acceptable use, disclaimers, and liability limits — remain in effect.

13

Changes and contact

We may update these Terms. The effective date at the top of the page will change. If a change is material, we will post it here and, when we have an email for you, we will try to notify you. Continued use after the new date means you accept the update. If you do not agree, stop using the services and close the account.

These Terms are governed by the laws of the United States, without regard to conflict-of-law rules. Courts in the United States have jurisdiction, except that if you are a consumer in the EEA or the UK you keep any mandatory protections of your home country.

Questions: mathkeys@gold.ly. These Terms are the whole agreement for the services, together with the Privacy Policy. If a court strikes one clause, the rest still applies.