Privacy Policy

Last updated: 4 July 2026

ChemPencil is a native desktop application (macOS and Windows) that runs entirely on your device. This policy explains what we do — and, more importantly, do not do — with your information.

Short version

ChemPencil does not collect, store, transmit, or share any personal data, usage data, or crash data. Everything you draw or open stays on your machine.

Data we collect

None.

• No accounts, sign-ups, or logins.
• No analytics, telemetry, crash reporters, or advertising SDKs.
• No third-party trackers.
• No advertising identifier (IDFA) is requested.

Documents and files

Documents you create, open, save, or export never leave your computer unless you choose to move them (for example by attaching a file to an email, saving to iCloud Drive or OneDrive, or copying to another folder). ChemPencil does not upload your files anywhere.

Network access

The Mac App Store version of ChemPencil ships without the network entitlement, and the Microsoft Store version declares no network capability in its package manifest — both builds are technically incapable of making network requests. You can verify this on macOS by inspecting the entitlements in the signed app bundle, and on Windows by reviewing the Package.appxmanifest capabilities in the installed package.

Sandbox

On macOS, ChemPencil is a sandboxed application. It has access only to the files you explicitly open or drop into it. On Windows, ChemPencil ships as an MSIX package with the standard desktop file-access model — it reads and writes only the files you open, save, or export through the normal system dialogs, and does not scan or index the rest of your disk.

Children

ChemPencil is a general-purpose tool suitable for all ages. Because we collect no data from anyone, we collect no data from children either.

Changes to this policy

If we ever change how ChemPencil handles data — for example, by adding an optional online feature in a future version — we will update this page and highlight the change in the release notes for that version. Older versions of ChemPencil that shipped under this policy will continue to behave as described above for as long as you keep using them.

Contact

Questions about privacy? Email support@chempencil.app.