Clocksimulator.com is a free analog clock that supports full-screen display. It contains no advertisements or tracking features.
Show HN: Analog Clock Web App Clocksimulator.com Released with OLED Protection and Offline Support
This article is a translation. Read the Japanese original
To protect OLED and AMOLED displays, the clock's position shifts slowly in a circular pattern every 10 minutes. Dark mode is also implemented as a feature to reduce the risk of burn-in.
This web app operates as a PWA (Progressive Web App). Once installed on a smartphone or computer, it can be used in full-screen mode even in offline environments.
Users can display any time zone by specifying an IANA time zone in the URL query parameter ?tz=. A dashboard mode, which allows multiple clocks to be displayed side-by-side, is also available by separating time zones with commas.
Furthermore, the app provides an embedding feature via iframe tags, making it compatible with video capture tools such as OBS. The developer stated that the site runs on sustainable energy and has achieved an A+ carbon rating.
Source: Show HN: Clocksimulator.com – A minimalist, distraction-free analog clock (HN 131pt, 103 comments) (HN Search (backfill), 2026-02-25)