The short version
This policy describes SignBack, published by Silvergrove Labs LLC ("SignBack," "we," "us," or "our"). The SignBack app does not collect personal data from your device for us. It does not contain advertising SDKs, third-party analytics SDKs, or cross-app tracking technology, and it does not upload your documents to a SignBack server.
We do not receive, sell, rent, or use your documents, signatures, signing identities, templates, form entries, contacts, location, device identifiers, or in-app activity for advertising or profiling.
Information kept on your device
SignBack processes document content locally on your iPhone or iPad. Local functions include PDF display and editing, scans, optical character recognition, Fast Fill suggestions, file conversion, signatures, initials, identities, templates, and supported document summaries that use on-device system intelligence.
Working documents, signatures, identities, templates, settings, and local workflow information are stored in SignBack's private app container. They remain under your control on the device and are not accessible to us. Device backups may include app data according to your Apple backup settings.
Apple services and on-device diagnostics
If you enable automatic export and iCloud Drive is available, SignBack writes a copy to the SignBack folder in iCloud Drive. Apple stores and processes that copy under your Apple account, settings, and Apple's privacy terms. SignBack does not operate its own cloud storage or cross-device sync service.
SignBack uses MetricKit, an Apple framework, to create an App Health report that is displayed and stored on your device. SignBack does not transmit that MetricKit report to us. Apple may separately process App Store, device, backup, crash, performance, or diagnostic information according to your Apple settings and Apple's policies. SignBack does not include a third-party analytics or tracking SDK.
On supported devices, document summaries use the on-device SystemLanguageModel provided through Apple's Foundation Models framework, the model technology behind Apple Intelligence. The document text and generated result stay on your device and are not sent to us. Availability depends on the device, system software, language, model availability, and Apple Intelligence settings.
Permissions and your choices
Depending on the feature you choose, SignBack may request camera or Photos access and may use Files, Face ID or device authentication, and Siri Shortcuts. You can review or revoke applicable permissions in iOS or iPadOS Settings. Some features will stop working when their permission is disabled.
Face ID and device authentication are handled by Apple's Local Authentication framework. SignBack receives an authentication result, not your face image or biometric data.
Information you send to support
Emailing support is optional. A support message may include your email address, app and system version, device model, issue description, screenshots, diagnostics, or files you intentionally attach. We use that information to respond, troubleshoot, keep a record of the request, protect the service, and improve SignBack.
Support providers used to deliver email or related business services may process that information for us and must handle it under contractual and legal protections. We do not use support information for advertising or sell it. Please do not attach confidential documents or signatures unless necessary and intentionally shared.
Retention, deletion, and security
Local SignBack content remains until you delete it or remove the app, subject to device backup and restoration behavior. You can delete documents, signatures, identities, templates, and other saved items in SignBack. Files previously sent to Files, iCloud Drive, Mail, Messages, or another destination must be deleted there separately.
We retain support correspondence only as long as reasonably needed to handle the request, maintain support records, improve the product, meet legal obligations, and resolve disputes, and in any case for no longer than 24 months after a request is resolved, unless a longer period is required to comply with law, resolve a dispute, or enforce our agreements. You may ask us to delete support information by emailing us; we will honor the request where required and may retain limited records when law or legitimate security and recordkeeping needs permit.
If we receive a valid legal request for support correspondence we hold, such as a subpoena, court order, or other lawful process, we may be required to disclose it. Where legally permitted, we will attempt to notify the person who submitted the request before doing so.
SignBack uses iOS and iPadOS app isolation and optional device authentication to help protect local content. No storage or transmission method is guaranteed to be completely secure, so protect your device, backups, exported files, and recipients.
Children and international users
SignBack is a general-purpose productivity app and is not directed to children. Because the app does not collect personal data for us, it does not knowingly collect children's personal data through app use. Contact us if you believe a child sent personal information to support.
Support information may be processed where our email and service providers operate. Where applicable, those providers use legal safeguards for international transfers.
California and other regional privacy rights
Using SignBack does not create an account or authentication profile. The app does not send Silvergrove Labs LLC your documents, signatures, identities, saved details, usage history, or other local app content, and we do not store that content on SignBack servers. We therefore generally hold no personal information about you from your use of the app and have no app content to access, sell, share, disclose, correct, or delete.
The only personal information we may receive directly from you is information you voluntarily include in an email to support. We do not sell or share that support correspondence or use it for cross-context behavioral advertising. If you are a California resident, or a resident of another U.S. state with comparable privacy rights, you may ask whether we hold support correspondence associated with your email address and request its correction or deletion where applicable. Submit a request to support@signback.io. We may need to verify your identity using the email address and details associated with your support request before responding.
Changes to this policy
We may update this policy when SignBack or legal requirements change. We will revise the effective date and provide any notice required by law. App Store privacy disclosures will also be updated when our data practices change.
Contact and privacy requests
Ask a privacy question, request deletion of information you sent to support, or raise a concern at support@signback.io. Because SignBack has no account and we do not receive local app content, we cannot access or delete files stored only on your device or in a destination you selected.