Last updated: 29 August 2026
A free classroom observation and seating-plan tool. There is no charge, no subscription, no account, and no login. Everything you enter is stored only in a file on your own device — see the Privacy Policy and /security for the detail.
ClassLens is a small, actively-developed tool. The app itself is a set of static files; if hosting is briefly unavailable, your data is unaffected because it lives in your own file, not on any server. But equally, we cannot recover your data for you if the file, or the device or folder it lives in, is lost or corrupted. Do not treat your linked file as your only record of anything you cannot afford to lose — keep the folder somewhere with its own version history.
Your data lives entirely in your own file — deleting or editing it is done directly by you, and we have no way to recover it once you do. There is no account to delete because there is no account.
ClassLens is provided “as is,” without warranty of any kind. We are not liable for any loss arising from your use of the product, including loss of data stored in a file you link to ClassLens.
ClassLens requires Chrome, Edge, or another Chromium-based browser. On an unsupported browser, or a managed device whose IT policy blocks folder access, the product may not be usable at all — a limitation of the browser feature involved, not a ClassLens outage.
Features may change. We have no access to your data and no accounts, so there is nothing to sell, share, or advertise against.
Questions about these terms: .