Apple Watch Ultra 4 vs Samsung Galaxy Watch Ultra
4 questions both answer, side by side. Every answer is backed by the dated sources at the bottom.
Side by side
Can a smartwatch work without your phone nearby?
Apple Watch Ultra 4 supports 5G (RedCap) and LTE, with antennas for cellular and satellite.
Good to know: Data plan required; 5G only in select markets.
Samsung says the Galaxy Watch Ultra is LTE-enabled, so you can leave your phone at home.
Good to know: Needs a carrier plan for LTE.
Can you talk to an AI assistant on your smartwatch?
Apple Watch Ultra 4 has Siri powered by Apple Intelligence.
Good to know: Maker's description.
Samsung's Galaxy Watch Ultra page includes Google Gemini on the watch.
Good to know: Requires a Google account with Gemini.
How long does a smartwatch battery last?
Apple rates Apple Watch Ultra 4 at up to 50 hours of normal use and 84 hours in Low Power Mode; 15 minutes of charging gives up to 18 hours.
Good to know: Maker's figures.
Samsung rates the Galaxy Watch Ultra at up to 100 hours in Power Saving mode, and up to 48 hours in Exercise Power Saving mode.
Good to know: Maker's figures for power-saving modes; normal-use hours aren't on the page.
Which phone does a smartwatch need?
Apple Watch Ultra 4 requires an iPhone 11 or later with iOS 27 or later.
Good to know: Apple lists iPhone models only.
Samsung lists the Galaxy Watch Ultra as compatible with Android 12 or later.
Good to know: Some features may need a Samsung Galaxy phone; check Samsung's page.
How we know (2 sources)
Apple Watch Ultra 4 tech specs (read Oct 24, 2026): up to 50 hours of normal use, up to 84 hours in Low Power Mode, up to 18 hours of workout tracking; 15 minutes of charging gives up to 18 hours. Supports 5G (RedCap) and LTE, with cellular/satellite antennas; data plan required. Siri powered by Apple Intelligence. Requires iPhone 11 or later with iOS 27 or later.
Read the sourceUS Galaxy Watch Ultra page (read Oct 24, 2026): from $649.99; battery up to 100 hours in Power Saving mode and up to 48 hours in Exercise Power Saving mode. LTE-enabled, so you can leave your phone at home. Gemini on the watch requires a Google account with Gemini. Compatible with Android 12 or later.
Read the source