Terms of Service

By creating an account, installing the desktop app, or connecting a Gmail account through Zerofinger, you agree to these Terms. If you don't agree, don't use the service.

We may update these Terms. When we do, we'll change the "Last updated" date at the top and, for material changes, give you reasonable notice by email or in-app before they take effect. Continuing to use Zerofinger after a change means you accept the updated Terms.

You must be at least 16 years old, or the minimum age your country requires to enter a contract, whichever is higher.

One human per account. You are responsible for keeping your sign-in credentials safe and for everything that happens on your account. Tell us at [email protected] if you think your account has been accessed without your permission.

Zerofinger is a desktop email client for Mac. It connects to your existing Gmail or Google Workspace account through Google's OAuth and the Gmail API, then keeps a local mail cache and search index on your Mac so the app feels fast.

Gmail remains the source of truth for your mail. Zerofinger's servers authenticate requests, proxy Gmail API calls, and store the account, subscription, OAuth, scheduled-send, reminder, and tracking records needed to run the service. Ordinary synced messages and attachments are cached on your Mac; feature records that require the server are described in the Privacy Policy.

Zerofinger uses Google Sign-In and the Gmail API to read, compose, send, and modify mail on your behalf, with the OAuth scopes you grant when you sign in. The current Gmail permission requested by the app is gmail.modify. Your use of Gmail itself is still governed by Google's Terms of Service. You can revoke Zerofinger's access at any time from your Google Account permissions page.

Billing for paid plans is handled by Stripe. When you start a paid subscription, your payment details are collected and stored by Stripe under its own terms. We receive a record of the charge but not your full card number.

You agree not to do any of the following, and not to authorize, encourage, or assist any third party (including any agent or automated system acting on your behalf) to do any of the following:

Reverse engineering and derivative works

• Reverse engineer, decompile, disassemble, decrypt, or otherwise attempt to derive or gain access to the source code, object code, underlying ideas, algorithms, file formats, or protocols of Zerofinger or any component of it, except as and only to the extent that the foregoing restriction is prohibited by applicable law. Users in the European Union and United Kingdom may exercise their statutory rights to obtain interoperability information under Articles 5 and 6 of Directive 2009/24/EC (or its UK equivalent), provided you first give us written notice at [email protected] and a reasonable opportunity to supply the information ourselves.
• Modify, adapt, translate, port, or create derivative works of Zerofinger, its documentation, or any of its features, functions, user interfaces, or visual design.
• Remove, obscure, or alter any proprietary notices in or generated by the app, including any trademark, copyright, or attribution notice.
• Apply the restrictions above to open-source components shipped with Zerofinger only to the extent permitted by the license that governs each such component (for example, Tauri, React, Squire, and DOMPurify each have their own license).

Distribution, competing products, and AI training

• Rent, lease, lend, sell, resell, sublicense, distribute, host as a service, frame, mirror, or otherwise make Zerofinger available to any third party outside the scope of your own use, or operate it as a service bureau, white-label, or outsourcing offering, without our written permission.
• Use Zerofinger, or any data or output you obtain from it, to build, train, or improve a competing email client, productivity app, generative AI model, large language model, or substantially similar product or service, or to copy any feature, workflow, or interface element of Zerofinger for any such purpose.

Technical limits, automation, and security

• Circumvent, disable, or interfere with any technical limitation, authentication mechanism, rate limit, license check, usage cap, or security feature of Zerofinger, of the Gmail API, or of any other system Zerofinger interoperates with.
• Access or use Zerofinger through any automated means — including bots, scrapers, crawlers, headless browsers, or unattended scripts — except through APIs and credentials we expressly provide for that purpose, or in a way that exceeds documented rate limits or the per-account fair-use levels we publish.
• Probe, scan, or test the vulnerability of Zerofinger or any system it relies on; perform any penetration test, security assessment, load test, or denial-of-service action; or breach or attempt to breach any authentication or access-control measure. Good-faith security research conducted under our coordinated vulnerability disclosure process — write to [email protected] to coordinate — is welcome, and we will not pursue it as a breach of these Terms or under the Computer Fraud and Abuse Act or comparable laws.
• Interfere with, disrupt, degrade, or impose an unreasonable load on Zerofinger, on the servers or networks that provide it, or on any other user's use of it — including by transmitting malware, malformed payloads, or excessive traffic.

Mail, identity, and the law

• Use Zerofinger to send spam or phishing, to violate Gmail's program policies or Google's terms, or to process or store any person's data in violation of applicable law.
• Misrepresent your identity or affiliation, impersonate any person, or use credentials, OAuth grants, or API keys belonging to another person without authorization.
• Export, re-export, or transfer Zerofinger in violation of any applicable export-control or economic-sanctions law.

We may suspend or end your access if we have a reasonable belief that you've broken these rules. For clear or repeated violations we may act without prior notice; otherwise we'll usually contact you first.

Zerofinger Free is permanent and requires no payment. Zerofinger Plus is a paid subscription billed monthly through Stripe in the currency shown at checkout. Pricing on the pricing page is what you pay; taxes may be added depending on your location.

You can cancel at any time from your account. Cancellation stops the next renewal — you keep Plus features through the end of the current billing period, after which your account drops to Free limits. Local data on your Mac is not deleted by cancellation.

If something goes wrong with a charge, write to us at [email protected] within 14 days of the charge and we'll make it right.

Your mail is yours. Nothing in these Terms transfers ownership of your messages, drafts, contacts, attachments, or other content to Zerofinger.

To make the app work, you give Zerofinger a narrow, revocable license to process the content you point it at — for example, to read a thread you open, send a reply you compose, archive a message you archive, or index your local mail for search. The license is limited to what's needed to deliver the feature you invoked, and it ends when you disconnect the account or uninstall the app.

We sometimes ship features marked as beta, preview, or experimental. They may change, break, or be removed without notice, and they are provided as-is. If a feature uses an AI model, its output may be incorrect — don't rely on it without checking.

As-is. Zerofinger is provided on an "as is" and "as available" basis, without warranties of any kind beyond those that local law won't let us disclaim. We don't promise the service will be uninterrupted, free of bugs, or that it will catch every important email.

Liability cap. To the maximum extent permitted by law, Zerofinger's total liability for any claim related to the service is capped at the greater of (a) the amount you paid us for the service in the twelve months before the claim, or (b) USD 100. We are not liable for indirect or consequential damages such as lost profits, lost data, or lost opportunities.

Your responsibility. You agree to cover Zerofinger against claims a third party brings against us because of how you used the service, including misuse of another person's mail or content you sent through the app.

You can stop using Zerofinger at any time by signing out, revoking the Google permission, and uninstalling the app. We may suspend or end your account if you break these Terms, if we're required to by law, or if continuing to provide the service becomes impractical. Sections that should reasonably survive termination — for example, liability limits and your obligations under section 9 — will survive.

Zerofinger is operated by an individual developer. Until a formal operating entity is established, these Terms are governed by the laws of the operator's country of residence and any dispute will first be resolved by good-faith discussion at [email protected]. If that fails, the dispute will be heard in the competent courts of that jurisdiction. We'll update this section, with notice, when an operating entity is registered.

Questions about these Terms? Write to [email protected].