Terms of Use

About these terms

These Terms of Use apply to the Letterfy website, iOS app and related services provided by Letterfy Inc. (“Letterfy,” “we,” “us,” or “our”). By accessing or using these services, you agree to these terms. If you do not agree, please do not use them.

Letterfy is currently in pre-release development. A coming-soon announcement or product preview does not promise a particular release date, feature, price or level of availability. Test builds may change and may contain errors or incomplete features. Newsletter detection, including Letterfy’s bundled classifier, is automated and can miss newsletters or include unwanted emails. You can review and correct these results; detection does not authenticate a publisher or confirm a subscription.

Our Privacy Policy explains how information is handled. Letterfy is not intended for children under 13. If you are not old enough to enter into these terms on your own, you must have permission from a parent or legal guardian.

Using Letterfy

Starting with build 57, fresh onboarding presents publication matching, catalog sharing, reader counts, automatic newsletter images, hourly automatic mail checks and all three count-only alert categories initially on. Review the explanations and turn off any choice before saving and continuing. Opening or dismissing the choices does not apply them. Previously saved choices are preserved when setup resumes, and updates do not change completed users’ preferences. All choices remain editable. iOS notification permission is separate and can be declined without preventing use of the app. Catalog sharing still follows the existing Add & verify and confirmed-subscription actions; choosing it during setup does not enroll all newsletters for contribution. See the Privacy Policy for data handling, withdrawal and retention.

You may use Letterfy for lawful, personal access to content and email accounts you are authorized to use. You are responsible for securing your device, accounts and access to the app, and for obtaining any permissions necessary to connect an account or access a newsletter.

You must not misuse the service, interfere with its operation, attempt unauthorized access, bypass access controls, or use it to infringe another person’s rights. Access to a newsletter through your mailbox does not give you permission to republish it or share material outside the publisher’s permitted terms.

Keep your device’s operating system and the app up to date. Modifying or bypassing your device’s security protections, including jailbreaking, can compromise your information or prevent Letterfy from working correctly.

Reader counts and weekly ranking

Publication counts and weekly rankings summarize optional completion contributions from participating app installations over the past seven days. An installation counts once per publication. These figures exclude non-participants and are not publisher subscriber totals, a verified count of people, proof that an article was fully read, or a measure of editorial quality. Counts can change as contributions expire, are withdrawn or become ineligible. Up to three qualifying publications are shown; an empty ranking does not mean nobody reads those publications. Starting with build 57, fresh onboarding initially selects reader-count sharing; you can turn it off before saving and continuing, or later in Privacy & data. Earlier builds start with sharing off, and existing saved choices are preserved. See the Privacy Policy for the information sent, retention and withdrawal behavior.

Ownership & content

The Letterfy app, website, branding, trademarks and original materials belong to Letterfy Inc. or its licensors. We grant you a limited, non-exclusive, non-transferable right to use the service in accordance with these terms and any applicable app-store license.

You may not copy, modify, distribute or create derivative versions of Letterfy, or attempt to extract its source code, except to the extent permitted by applicable law or a separate applicable license. These terms do not override rights granted by licenses for open-source components. App Store downloads are also governed by Apple’s Standard Licensed Application End User License Agreement unless a separate custom license is identified for the app. These website and service terms do not replace that app license.

Newsletters, articles and publisher artwork belong to their respective owners. We do not take ownership of your emails or subscriptions. You are responsible for respecting publisher terms, copyright and other rights when using content.

Visual sharing

You can choose to export visual cards with selected passages, newsletter titles, public discussion excerpts or publication information to another app. Review the preview and any caption before sharing. Sharing newsletter content requires the rights or permission applicable to that content; receiving an email does not grant republication rights. Do not share confidential or personal information without authorization. Cards may use shortened excerpts and are not a substitute for the original source. The destination app controls posting, presentation and retention. Letterfy cannot remove independent copies held by recipients or other services.

Public discussions

Public discussion features are optional and require a compatible app build and a supported AT Protocol account. Your provider’s terms also apply. Connecting makes your existing public name, handle, biography and profile photo available to other Letterfy readers, subject to moderation. It does not create posts or change your provider’s records. Public profile details are chosen by the account holder and do not establish a verified legal identity. When you choose to publish, you instruct Letterfy to transmit your chosen record to your personal data server and to index and display it as part of the discussion service. Public records can be copied and displayed by other services.

You retain any rights you hold in your contributions. Publish only content you are entitled to share, including any newsletter passage you choose to quote. Mailbox access or Letterfy’s reader check does not grant permission to republish someone else’s work and does not certify a paid subscription. Do not post unlawful content, hateful or discriminatory abuse, harassment, threats, encouragement of violence or self-harm, profanity, spam, or another person’s confidential information. These rules also apply to selected newsletter quotes and public profile text. Letterfy uses deterministic language checks before publication and indexing, and the team reviews community reports. Automated checks can miss prohibited content or reject legitimate discussion; you can edit the wording, report a concern, or contact support about a decision.

You can report a public post or block a participant through the post menu. Letterfy may remove content from its index or restrict participation to address misuse or protect users, subject to applicable law. Contact support@letterfy.com with a concern about a moderation decision. A block or removal within Letterfy does not erase records held by independent services.

Deleting your own post requests deletion from your personal data server and reconciliation of Letterfy’s index; it cannot guarantee removal of copies others have made. Disconnecting a community account clears local access but does not delete its public records or revoke the provider’s authorization grant. Use the provider’s account controls to revoke that grant.

Connected & third-party services

Starting with build 44, publication matching is initially on during onboarding; you can turn it off before continuing or later in Privacy & data. Existing choices are preserved. While enabled, Letterfy uses batched source identifiers and hashes of issue titles to find existing catalog records, including for newsletters added privately. Discover, issue browsing and publisher artwork load in bounded requests. Matching may be unavailable offline, and cached IDs can change after catalog corrections. These lookups are separate from optional catalog contributions; see the Privacy Policy for processing details.

Some features depend on your email provider, internet connection, device, app store or other third-party services. You must also comply with the terms that apply to those services. We do not control their availability, content or policies.

Relevant terms and policies include Google’s Terms of Service, the Google API Services User Data Policy, and Apple Media Services Terms and Conditions. A link does not imply that those providers endorse Letterfy.

You are responsible for internet, mobile data and roaming charges incurred while using the service. If someone else pays for your device or connection, obtain their permission where needed. Offline access is limited to content successfully downloaded and still stored on your device.

Changes, availability & charges

We may update, add, change or discontinue features or services. Device and operating-system requirements may change. We cannot promise that every version will remain compatible with your device or that the service will always be available without interruption.

If we introduce a paid feature or subscription, we will clearly explain the price and applicable purchase terms before you agree to pay. These terms do not by themselves authorize a charge.

We may suspend or end access when reasonably necessary to protect the service, address misuse, comply with law, or discontinue the service. We will provide notice where required by law. You may stop using Letterfy at any time. Disconnecting an account or deleting the app does not cancel a newsletter subscription with its publisher.

Service limits & responsibility

Discover may include publications and issues checked automatically against public publisher websites and feeds, as well as entries reviewed by an administrator. Community verification can also use matching content fingerprints from multiple verified app installations after readers choose Add & verify to identify likely newsletter sources. This is a probabilistic signal, not proof of distinct recipients or cryptographically authenticated delivery. Fingerprints may fail to match personalized copies or match misleading content. They do not transmit email bodies. Publication details and public issue links still require validation. Catalog checks can be incomplete or mistaken. Inclusion does not certify sender authenticity, a paid subscription, publisher endorsement or permission to reuse content or artwork. Contact us to request correction of a catalog entry. Your personal newsletter choices and subscriptions remain separate.

Letterfy helps you find and read newsletters, but detection, synchronization, search and third-party content may be incomplete or inaccurate. Do not rely on Letterfy as the only copy of important messages. Your email provider remains the source for your mailbox. Possible newsletters offers uncertain emails for your review and may include messages that are not newsletters. You can search for and explicitly add missed emails. Adding them approves their senders locally and preserves their read status; it does not establish sender authenticity or change your subscriptions.

In compatible builds, Remove from Letterfy hides newsletter senders from your reading library without changing your email subscriptions or deleting email at your provider. Saved issues stay available. You can restore a sender through Your newsletters → Hidden senders. This local choice does not cancel paid billing.

Choosing Unsubscribe authorizes Letterfy to send the publisher’s supported unsubscribe request. A successful response indicates that the endpoint accepted the request; it does not prove that delivery has stopped. Publishers may take time to apply requests. Some messages require completing the process on the publisher’s page, and unsupported or expired actions may need to be handled in your original mailbox. Letterfy does not automatically retry uncertain requests. Unsubscribing from email delivery does not cancel paid billing, delete an account or remove downloaded issues.

Subscription confirmation review uses local rules and, in compatible builds, an on-device intent model to surface recent newsletter signup links for you to inspect. It can miss or misidentify requests and does not verify sender authenticity, destination safety or whether a subscription succeeded. Only open requests you expected. Choosing to open a confirmation link contacts the publisher’s site and may activate a subscription under that publisher’s terms. Letterfy does not open these links automatically, and dismissing a request does not cancel a subscription. Expired links may require a new request from the publisher. In builds with confirmation completion, choosing “I’ve confirmed” tells Letterfy that the publisher reported success and adds the newsletter to your library. Letterfy does not independently verify that report. Publication metadata may be submitted under your catalog-sharing setting for separate review; local subscription confirmation does not approve a public catalog listing.

Optional automatic mail checks use your chosen interval as a target. Background checks and notification delivery depend on iOS, device conditions, network access and your settings; they are not guaranteed to occur at an exact time. You can disable automatic checking or change its frequency in the app.

To the extent permitted by applicable law, the service is provided “as is” and “as available,” without a guarantee of uninterrupted availability, accuracy or fitness for a particular purpose. We are not responsible for failures caused by unavailable third-party services, an incompatible or unsecured device, a lost internet connection or events outside our reasonable control.

To the extent permitted by applicable law, Letterfy Inc. is not liable for indirect or consequential losses arising from your use of, or inability to use, the service. Nothing in these terms excludes or limits rights, warranties, remedies or liability that cannot lawfully be excluded or limited, including applicable consumer rights.

Updates to these terms

We may revise these terms as Letterfy develops. The current version will be posted here with an updated effective date. We will provide additional notice where required for material changes. Your continued use after revised terms take effect is subject to those terms, to the extent permitted by law.