Privacy policy

Effective October 31, 2026

BooxDay is a free, open-source planner app for Onyx BOOX tablets. It has no server, no accounts of its own and no analytics. The developer of BooxDay never receives your data.

What BooxDay stores

Everything you create in BooxDay (memos, tasks, handwriting, events, settings) and the calendar and task data it syncs is stored in the app's private storage on your tablet. None of it is sent to the developer of BooxDay. Other apps can't read this storage, except the task list described under "Other apps on your tablet". Uninstalling the app deletes this data from the tablet.

Data from your Google account

Connecting a Google account is optional. If you connect one, BooxDay asks for these permissions and uses them only as described on this page.

What BooxDay accesses

• Your Google Calendar events (view and edit events on your calendars): on the calendars you sync, each event's title, start and end time, all-day setting, location, description and the email addresses of invited people. All your calendars are synced unless you turn some off in Settings → Calendar Accounts.
• The list of your Google calendars: their names and colours, so you can choose which ones to sync.
• Your Google Tasks, only if you turn on Task Sync (view and edit your tasks; Settings → Preferences → Task Sync, coming in a future version of BooxDay): the names of your task lists and, in the lists you tick, each task's title, done mark, due date and the task it sits under. BooxDay doesn't use or keep task notes. BooxDay asks for this permission on its own, only when you turn Task Sync on.
• Google Drive, limited to files BooxDay creates: the backup files BooxDay saves in a folder named "BooxDay Backups". BooxDay can't see or change any other file in your Drive.
• Your Google account's email address and name, to show which account is connected.

How BooxDay uses it

• To show your events in BooxDay and keep them up to date.
• To save events you add, change or delete in BooxDay to your Google Calendar. BooxDay writes to your calendar only when you save or delete an event. If you invite people to an event, Google sends them invitations as it normally does.
• To keep your tasks in step with Google Tasks, only while Task Sync is on: BooxDay brings in the tasks from the lists you tick, and saves to them the words, done mark, due date and subtasks of the tasks you write in BooxDay. Your handwriting itself, priorities, reminders and time estimates stay on the tablet. A synced task you clear or delete in BooxDay is deleted in Google Tasks too.
• To save backups of your planner to your Drive and restore them, only if you turn on Cloud Backup or tap Backup Now.
• For event reminders, which are scheduled on the tablet. Nothing is sent anywhere for them.
• For the optional features you turn on that use your events and tasks: AI features, the sleep screen agenda and daily notes files, each described below.

Where it is stored

Copies of your synced events and tasks are kept on your tablet, in BooxDay's private storage, so the planner works offline. BooxDay never sees your Google password: Google sign-in is handled by Google Play services on the tablet, which also keeps the sign-in tokens.

Who it is shared with

BooxDay doesn't send Google user data to its developer or to any server run by BooxDay, doesn't sell it and doesn't use it for advertising. No one working on BooxDay reads it. BooxDay doesn't use Google user data to develop, improve or train AI models. Google user data leaves your tablet only in these cases:

• Google, to sync your calendar, your tasks (if you turn on Task Sync) and your Drive backups.
• OpenRouter and the AI company whose model answers, when you start one of the AI features that use your calendar or tasks (including tasks from Google Tasks), on your own OpenRouter account (see "Optional AI features").
• Files you turn on: the sleep screen picture and daily notes files, saved on your tablet (see "Files BooxDay saves outside its own storage").
• A crash report, only if you choose to share it (see "Crash reports").
• Android's own device backup. If backup is turned on in your tablet's settings, Android may include BooxDay's data, including your synced events and tasks, in the backup it saves to your Google account. You control this in the tablet's settings.

BooxDay's use and transfer of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements.

Data from your Microsoft account

If you connect an Outlook or Microsoft account, BooxDay reads your basic profile (name and email) to show which account is connected, and reads and edits your Outlook calendar events. It uses them the same way as Google Calendar events: kept on your tablet, synced with Microsoft, and sent to OpenRouter only by the AI features you start. Microsoft's sign-in library keeps the sign-in tokens on the tablet. Nothing is sent to the developer.

Optional AI features

AI features work only after you connect your own OpenRouter account. BooxDay has no AI account of its own. When you use an AI feature, BooxDay sends what that feature needs to OpenRouter, which passes it to the AI company whose model answers. OpenRouter and that company handle it under their own policies (OpenRouter's privacy policy). With AI Features turned off (Settings → AI Settings), BooxDay sends nothing to OpenRouter. Nothing is sent to the developer.

• Optimize My Day, Daily Summary, Weekly Summary and Smart Suggestions send your events with your tasks and notes: titles, times, locations and, for some of them, the email addresses of invited people and part of the description. Optimize My Day can also include events downloaded earlier from calendars you have since turned off. These features send only when you start them, and the first time you use one, BooxDay explains this and asks before sending anything. Smart Suggestions and Optimize My Day also send your AI options (how many suggestions you want, whether Vacation mode is on, and whether you want health or social ideas).
• Reading your handwritten pages for search sends pictures of your BOOX Notes and memo pages in the background, only while AI Features (Settings → AI Settings) and Enable Indexing (Settings → Boox Notes, off until you turn it on) are on. These requests ask OpenRouter to use only providers that keep no copy. They contain no calendar data. Task pages are read on the tablet.
• Handwriting to text, summaries, translation and turning memos into tasks send the memo or task text, or the page pictures, you choose.
• Voice input: depending on the voice setting, your recording is sent to OpenRouter to be turned into text, or handled by your tablet's own speech recognition.

Free and paid models. If your OpenRouter account has no credit, BooxDay uses free models. The companies that run free models may keep what they are sent, use it to improve their AI and let their staff read it (Google's terms for its free Gemini API, for example, say so). With credit on your account, BooxDay uses paid models, and you can pick the model for each job in AI Settings → AI Models. To make sure no copy is kept, turn on Zero Data Retention in your OpenRouter privacy settings. BooxDay doesn't change these settings for you.

Your OpenRouter key is stored encrypted on the tablet and is never included in backups.

Files BooxDay saves outside its own storage

Only if you turn these on:

• Today on sleep screen saves a picture of today's events (titles and times), tasks and memo in Pictures/BooxDay and hands it to the BOOX system, which copies it to show while the tablet sleeps. Turning the setting off deletes these pictures.
• Daily notes saves a Markdown file for each day (event times, titles and locations, tasks and memo text) in Documents/BooxDay/Daily Notes or a folder you choose.
• Exports you make are saved where you choose.

Other apps that can read these folders, and any sync service you use for them, can see these files.

Other apps on your tablet

BooxDay offers a task list that other apps on the tablet can read: your task text, due dates, priorities and whether tasks are done, including tasks that came from Google Tasks when Task Sync is on. It doesn't include calendar events, account details or handwriting.

Crash reports

If BooxDay closes unexpectedly, it saves a report on the tablet and offers it at the next start. Nothing is sent unless you tap Copy Report or Report on GitHub. The report contains technical details and recent lines from the app's own log. Email addresses in it are partly hidden, but it can contain some event titles. Read it before posting it: reports on GitHub are public.

Other network use

• Updates: shortly after it starts, BooxDay checks the BooxDay GitHub releases page for a newer version, and downloads it from GitHub if you choose to update. No personal data is sent.
• Handwriting recognition for tasks runs on the tablet. Its language models are downloaded from Google the first time.

Like any internet request, these connections show your IP address to the server they reach (Google, Microsoft, OpenRouter, GitHub).

Keeping and deleting your data

• Your data stays on the tablet until you delete it or uninstall BooxDay.
• Removing a Google or Outlook account in BooxDay (Settings → Calendar Accounts) deletes the events BooxDay downloaded for that account, and the account's email address, name and calendar choices. Removing the last Google account also withdraws BooxDay's access to your Google account.
• Turning Task Sync off stops it. Your tasks stay on the tablet and in Google Tasks. Removing the Google account Task Sync uses stops it too.
• Turning a calendar off stops syncing it. Events already downloaded from it stay on the tablet, hidden, until you remove the account.
• You can withdraw BooxDay's access at any time: for Google at myaccount.google.com/permissions, for Microsoft at account.live.com/consent/Manage.
• Backups in your Google Drive stay in the "BooxDay Backups" folder until you delete them there.
• Uninstalling BooxDay deletes everything in its private storage. Files it saved in shared folders (sleep screen pictures, daily notes, exports) stay until you delete them.

Security

Connections to Google, Microsoft, OpenRouter and GitHub use HTTPS. Sign-in tokens are kept by Google Play services and Microsoft's sign-in library, and BooxDay keeps your OpenRouter key in encrypted storage on the tablet.

Children

BooxDay is not directed at children under 13.

Changes and contact

If BooxDay starts using your data in a new way, this page is updated before that version is released, with a new effective date at the top. Questions can be raised on the BooxDay GitHub issues page.