Privacy
Last updated: 21 June 2026
Dian is a vocabulary widget app. It works quietly in the background of your phone, showing you words from your chosen languages. This page describes what data it touches, where that data lives, and what your options are.
The short version: Dian collects very little. It doesn't ask for your name, email, or any personal details. It doesn't track what you do across other apps or websites. It doesn't show advertising. It uses an anonymous identifier to remember your settings, and stores your preferences on a server so they survive between sessions.
If you'd like the detail, it's below.
What Dian collects
An anonymous identifier
When you first open Dian, the app creates an anonymous identifier — a random string of characters that Dian uses to tell your phone apart from anyone else's. This identifier is not connected to your name, email, phone number, contacts, location, or any other personal information. Dian never asks for and never receives any of those.
Your language preferences and settings
To show you the right words, Dian stores your choices on its server:
- Your native language
- The foreign languages you're learning (up to three)
- The difficulty level you've selected
- The themes you've chosen (e.g. travel, food, business)
- Your subscription status (free or premium, once subscriptions exist)
- The date you were last active
- Your current streak count, if any
These are tied to your anonymous identifier. They let your settings persist between phone restarts and let the widget show you words that match what you asked for.
Data stored only on your phone
Some things stay on your device and never leave it:
- The list of words you've saved for review
- Your interface preferences (which languages are collapsed on the word card, for example)
- Audio is generated on your phone using your device's built-in text-to-speech — no recordings are uploaded anywhere
If you uninstall Dian, this local data is removed with the app.
Standard platform information
When you install Dian from the App Store, Apple may share standard information with Dian — things like the country your App Store account is in, your device model, and your iOS version. This comes through Apple's normal App Store processes. Dian also doesn't have its own analytics or crash reporting beyond what Apple provides by default to all App Store apps.
What Dian does not collect
To be specific, Dian does not collect:
- Your name, email address, phone number, or any contact information
- Your location, GPS, or any sense of where you are
- Your contacts, photos, calendar, microphone, or camera
- A list of other apps on your phone
- A history of websites you visit or apps you use
- Any kind of advertising identifier (no IDFA, no fingerprinting)
- Information from third-party trackers or analytics services
- Anything to send you marketing emails or notifications
The app doesn't ask for permissions beyond what's needed to show a widget and play audio on your device.
Where your data lives
The settings tied to your anonymous identifier are stored on Supabase, a database service hosted in Tokyo, Japan. Dian uses Supabase's standard authentication and database features. Supabase has its own privacy policy describing how it handles data on behalf of services like Dian.
Vocabulary content (the words, definitions, translations, audio pronunciation guides) lives on the same Supabase database. This content is the same for everyone — it's not personal to you.
When subscriptions launch, payment processing will happen through Apple's App Store, not through Dian directly. Dian receives a subscription status from Apple's servers but never sees your payment information.
Your choices
- You can use Dian without signing up for anything. There is no sign-up form. There is no email field. The anonymous identifier happens automatically and silently.
- You can delete all your data by uninstalling the app. Because the anonymous identifier is created fresh on each install, removing the app removes the connection to your settings on the server. Reinstalling would create a new anonymous identifier and a new set of default settings.
- You can request data deletion explicitly. If you ever want your anonymous identifier and its associated settings removed from the server even without uninstalling, you can write to the address below with the identifier (visible in the app's debug settings) and we'll delete it.
Children
Dian is designed for adult language learners. It is not directed at children under 13. Dian does not knowingly collect any information from children. If you believe a child has been using Dian, please contact us so we can remove any associated data.
Changes to this policy
When Dian adds new features that affect what data it touches — for example, the named accounts planned for a future release — this policy will be updated. The "last updated" date at the top of this page will change, and meaningful changes will be reflected in the app itself before they take effect.
Contact
Questions about privacy in Dian:
We aim to respond within a few days.