Privacy Policy for Conceptarium

Effective July 31, 2026

Conceptarium is an Android app that teaches one concept per day through a homescreen widget. This policy explains what the app does and does not do with your data. I am the app's sole developer, and I wrote this policy myself rather than generating it from a boilerplate service, because I wanted it to describe this app specifically.

The short version

I don't collect anything. Conceptarium has no account, no analytics, no crash reporting, no advertising, and makes no network calls of its own. It requests no permissions. Everything the app remembers about you stays on your device.

What the app stores, and where

The app saves a small amount of state locally on your device, using Android's standard on-device storage (Jetpack DataStore). This includes things like:

• which concept categories you have enabled
• which concept you're currently on, and which ones you've saved
• the widget's appearance — its colors, background opacity, and whether it shows the category
• the app's text size and how often a new concept arrives

None of this ever leaves your device. It is not sent to me, to any server, or to any third party. It is stored only in the app's private storage and is deleted automatically if you uninstall the app.

Permissions

Conceptarium requests no runtime permissions — no location, no contacts, no storage access, no network state, nothing. Its manifest declares none.

Content that's already on your device

Every concept the app can show you is bundled inside the app itself at install time. Showing you a concept does not involve downloading anything or contacting a server.

When the app hands you off elsewhere

A few actions in the app open something outside of it. In every case, this only happens when you deliberately tap that action — never in the background, and never automatically.

• Reading further on Wikipedia. Some concepts link to a Wikipedia article. Tapping that link opens the article in your browser or Wikipedia app. That page is served by the Wikimedia Foundation, under its own privacy policy — Conceptarium plays no part beyond opening the link.
• Rating the app. Tapping the rate action opens Conceptarium's Google Play listing. That page is served by Google, under Google's own privacy policy.
• Sharing a concept. Sharing hands the concept's text to whatever app you choose from Android's share sheet — Messages, email, or anything else installed on your device. Conceptarium doesn't send that text anywhere itself; from that point on, it's governed by whichever app and recipient you picked.
• Reporting a concept. If you choose to report a problem with a concept, the app opens a web form (built with Tally, at tally.so) in your browser. The link includes the concept's internal ID, its title, and the app's version number, so I can identify what you're reporting — nothing else about you or your device is included by the app. Whatever you type into that form, if anything, is submitted to and processed by Tally under Tally's own privacy policy.

Children's privacy

Conceptarium does not knowingly collect personal information from anyone, including children, because it does not collect personal information from anyone at all.

Changes to this policy

If this policy changes — for example, because a future version of the app adds a feature that behaves differently — I'll update this page and the effective date above.