Folio is a local-first document opener. It collects no personal data, has no accounts, and makes no network requests. Updated Aug 16, 2026.
Folio is a local-first Android document opener. It has no accounts, no sign-in, no analytics, and no network access. The INTERNET permission is explicitly removed from the application manifest.
We — ClassEve — do not collect, receive, transmit, store, or process any personal data about you in connection with your use of Folio. Everything Folio does happens entirely on your device.
Folio does not collect, transmit, or retain: your name, email address, phone number, IP address, advertising identifiers, device fingerprints, location, contacts, photos, microphone audio, camera images, calendar entries, sensor data, browsing history, installed apps, or any other personal data.
Folio does not include analytics or telemetry SDKs of any kind. No Firebase, no Crashlytics, no Google Analytics, no Mixpanel, no Sentry, no Amplitude, no in-house event collection. Folio never reports usage data back to ClassEve or any third party.
Folio does not include advertising or third-party tracking. There are no ads, no ad SDKs, no attribution SDKs, no marketing automation.
Recently opened documents: Folio stores a list of recently opened documents in its local Android DataStore so the Recents view can offer one-tap reopening. This list contains only the document references (URIs), display names, and timestamps. It never leaves your device.
Editor sessions: For text and Markdown files you edit, Folio temporarily stores the unsaved buffer in app-local storage so a system kill does not lose your work. The buffer is cleared when you save or discard.
Preferences: Your chosen theme (light, dark, or system) is stored in local DataStore so it persists across launches.
All of the above stays in Folio's app-private storage on your device. Android normally isolates that storage from other apps, and ClassEve has no remote access to it. A rooted, compromised, or developer-modified device can weaken the operating system's isolation boundary.
Folio declares zero runtime permissions. It does not request access to storage, network, microphone, camera, contacts, location, calendar, or any other protected resource.
To open a document, Folio uses the Android Storage Access Framework (SAF). When you tap "Open", Android (not Folio) shows you a system picker. You select a file, and Android grants Folio a one-time URI permission to read that specific file. Folio never sees the rest of your filesystem.
The INTERNET permission is explicitly excluded from Folio's manifest using `tools:node="remove"`. Android therefore prevents the Folio app process from opening ordinary internet connections. User-initiated Share, Print, or Open-with actions can hand a selected document to another installed app or system service.
Folio renders PDF, DOCX, RTF, XLSX, CSV, PPTX outlines, Markdown, and plain-text files. Parsing, layout, and rendering happen on your device using Android's PdfRenderer and Folio's bundled parsers. Folio does not upload document content to ClassEve or another service. A document leaves Folio only when you invoke an Android hand-off such as Share or Print.
When you tap Share or Print, Android's standard share sheet or print framework appears. Folio hands the document to the OS, which then offers it to other apps you have installed. Folio has no role in or visibility into what happens after that hand-off.
Folio collects no personal data, so it does not target or knowingly collect data from anyone, children included. The app is suitable for all ages with respect to data handling.
If we ever change Folio's privacy behavior — for instance, if a future major version adds optional cloud sync — we will update this policy and clearly disclose the change inside the app before the new behavior takes effect. We will not silently change what Folio collects.
This policy was last updated on Aug 16, 2026.
Questions or concerns about Folio's privacy practices: [email protected]
Privacy contact: ClassEve — [email protected].