DT Ultra 4 Pro OS26 vs HK11 Ultra 3 Generation 2: Full Comparison & Buyer’s Guide

Budget Apple Watch Ultra–style smartwatches are more popular than ever, and two models dominate the discussion right now: DT Ultra 4 Pro OS26 and HK11 Ultra 3 Generation 2.

Both promise premium design, AMOLED displays, smooth UI, always-on display support, and advanced smart features — all at a fraction of the cost of the Apple Watch Ultra.

In this in-depth comparison, we’ll break down design, display quality, UI smoothness, watch faces, storage, apps, battery life, and real-world usability to help you decide which smartwatch is the better option for your needs.


Table of Contents


Introduction

The DT Ultra 4 Pro OS26 and HK11 Ultra 3 Generation 2 both take heavy inspiration from Apple’s Ultra lineup, offering rugged design, large displays, and feature-rich software. While they look similar on the surface, the real differences appear in display behavior, always-on brightness, storage capacity, battery life, and overall usability.

This comparison focuses on real-world usage rather than just specs, helping you choose the watch that best fits your priorities.

Design, Body Type & Accessories

Both smartwatches feature a 49 mm case size, closely matching the Apple Watch Ultra dimensions. Build quality feels solid on both, and they look premium for their price category.

  • Rugged Apple Watch Ultra–inspired design
  • Compatible with Apple Watch Ultra cases
  • Compatible with Apple Watch straps and strap tools

Crown & Button Design

DT Ultra 4 Pro OS26 is widely appreciated for its clean and modern crown design.

HK11 Ultra 3 Generation 2 is often criticized for its crown key, which hasn’t changed across multiple generations. While functional, it feels slightly outdated.

Design Verdict: Tie, with a slight edge to DT Ultra 4 Pro OS26.

Display Type, Size & Colours

Both watches use an AMOLED display, offering deep blacks, vibrant colours, and excellent contrast.

Display Smoothness

The HK11 Ultra 3 Generation 2 stands out for UI smoothness. HK models are known for fluid animations, and this watch continues that tradition.

The DT Ultra 4 Pro OS26 is also smooth and polished, though slightly behind HK11 in animation fluidity.

Display Size & Bezels

  • DT Ultra 4 Pro OS26: Larger display, thinner bezels
  • HK11 Ultra 3 Generation 2: Smaller display, thicker bezels

Display Size Winner: DT Ultra 4 Pro OS26
Smoothness Winner: HK11 Ultra 3 Generation 2

Always-On Display Performance

This is one of the biggest differences between the two smartwatches.

HK11 Ultra 3 Generation 2

  • Brighter always-on display
  • Clearly visible indoors
  • Better AOD readability overall

DT Ultra 4 Pro OS26

  • Always-on display is noticeably dim
  • Sometimes difficult to see in room lighting

AOD Winner: HK11 Ultra 3 Generation 2

OS26 UI, Smoothness & Navigation

Both watches run an OS inspired by Apple’s latest watchOS design language, commonly referred to as OS26 UI.

  • Smooth app icons
  • Fast widget scrolling
  • Liquid-glass style control center

The notification center is cleaner and more refined on the HK11 Ultra 3 Generation 2, while the DT Ultra 4 Pro OS26 still performs very well.

UI Experience Winner: HK11 Ultra 3 Generation 2

Watch Faces & Customization

HK11 Ultra 3 Generation 2

  • 8 built-in watch faces
  • Each face has its own always-on display
  • Colour change requires tap-and-hold (prevents accidental changes)
  • Global version: 6 downloadable faces
  • Chinese version: 10 downloadable faces

DT Ultra 4 Pro OS26

  • Large number of built-in watch faces
  • Offline dial market on the watch
  • Dynamic animated watch faces
  • Custom AOD available only on first 15 faces

Watch Face Variety Winner: DT Ultra 4 Pro OS26
AOD Customization Winner: HK11 Ultra 3 Generation 2

Screen Timeout & Display Behavior

DT Ultra 4 Pro OS26

  • 20-second timeout that behaves like AOD
  • Display can stay on until battery drains

HK11 Ultra 3 Generation 2

  • Screen-on time up to 30 seconds
  • Constant light mode up to 20 minutes

Winner: DT Ultra 4 Pro OS26

Health Sensors Overview

Both smartwatches include a pedometer and blood oxygen (SpO₂) monitoring. Performance is comparable for casual health tracking, and both are suitable for everyday use rather than medical purposes.

Local Storage & Media Support

HK11 Ultra 3 Generation 2

  • Very limited internal storage
  • Slow file transfer via app
  • 10–15 songs (Global), 30–35 songs (Chinese)
  • Supports music, 6 images, audio recording, e-books

DT Ultra 4 Pro OS26

  • Real 4 GB internal storage
  • Fast transfer via OTG and magnetic cable
  • Supports music, images, long audio recordings
  • Supports video playback (AVI format)

Storage Winner: DT Ultra 4 Pro OS26

Network Sharing & Smart Apps

DT Ultra 4 Pro OS26 includes Google Maps, WhatsApp, and a translator, making it more practical for daily use.

HK11 Ultra 3 Generation 2 focuses on AI apps, game market, and additional utilities, though some features require network sharing.

NFC Capabilities

Neither smartwatch supports NFC payments.

Utility Applications

  • Timers: DT keeps vibrating until stopped; HK11 vibrates once
  • Stopwatch: DT can run in background; HK11 resets on exit
  • Alarms: Both are loud; DT is slightly louder
  • Weather: HK11 is slightly more accurate
  • Calculator: Percentage calculations are inaccurate on both

Battery Capacity & Battery Life

  • DT Ultra 4 Pro OS26: 400 mAh
  • HK11 Ultra 3 Generation 2: 270 mAh

With Always-On Display Enabled:

  • DT Ultra 4 Pro OS26: 3–4 days
  • HK11 Ultra 3 Generation 2: 1.5–2 days

Battery Winner: DT Ultra 4 Pro OS26

Final Verdict

Choose HK11 Ultra 3 Generation 2 if your priority is a bright always-on display, smoother UI animations, and refined watch face design.

Choose DT Ultra 4 Pro OS26 if you want significantly better battery life, massive internal storage, offline media playback, and stronger utility features.

Overall Winner: DT Ultra 4 Pro OS26 offers better value for most users, while HK11 Ultra 3 Generation 2 remains the better choice for display-focused users.

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DT Ultra 4 Pro OS26 vs HK11 Ultra 3 Generation 2: Full Comparison & Buyer’s Guide

Budget Apple Watch Ultra–style smartwatches are more popular than ever, and two models dominate the discussion right now: DT Ultra 4 Pro OS2...

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