Amazfit GTR 4 vs T-Rex 3: What Are The Key Differences?
Naila Syifa
Updated January 2025
Amazfit has a range of smartwatches to cater to different needs and budgets. For sports and fitness enthusiasts, the GTR 4 and T-Rex 3 are some great options to consider. The GTR 4 is the more mid-range option at USD 199.99, while the T-Rex 3 is on the higher end at USD 279.99. What additional features and capabilities does the T-Rex 3 offer over the GTR 4? Are they worth the higher price tag?
Key Takeaways
Compared to the GTR 4, the T-Rex 3 has a more rugged, military-grade design with 23 additional sports modes covering triathlon, multi-sports, ultramarathon, freediving, surfing, skydiving, etc. It also boasts 55% more battery capacity for longer runtime, but the T-Rex 3 lacks the speaker that GTR 4 has, which allows for on-wrist calls and music playback.
Amazfit GTR 4
Smart Fitness Made Easy
✓ 1.43” AMOLED
✓ Strength Exercise Recognition
✓ Built-In Speaker & Microphone
✓ Dual-Band GPS
Amazfit T-Rex 3
Rugged GPS Smartwatch
✓ 1.5"AMOLED
✓ Military Grade & 10 ATM
✓ 177 Sports Modes
✓ Zepp Coach & Zepp Flow
Design & Display
Amazfit T-Rex 3
While both smartwatches boast a masculine, sporty design, the Amazfit T-Rex 3 is physically more rugged. Its military-grade body is designed to withstand harsh outdoor conditions ranging from -22°F to 158°F (-30°C to 70°C), while the 10 ATM water resistance rating allows it to withstand water pressure up to 328 feet (100 meters). It is also certified for freediving up to 147 feet (44.8 meters).
Meanwhile, the Amazfit GTR 4 is not as rugged as the T-Rex 3. It's not graded for military durability standards and has a lower 5 ATM water resistance rating, meaning it can withstand water pressure only up to 164 feet (50 meters). It's still great for shallow-water activities like swimming and snorkeling but not suitable for diving.
The T-Rex 3 also features a Gorilla Glass screen and stainless steel bezel, which are more durable and premium materials than the standard tempered glass and anti-glare glass bezel on the GTR 4.
In terms of display, the T-Rex 3 again takes the lead with its 1.5-inch AMOLED display with a higher 480 x 480 pixels resolution, compared to the 1.43-inch AMOLED screen on the GTR 4 with 466 x 466 pixels resolution. A larger screen and higher resolution mean better visibility and clarity for outdoor activities.
However, the T-Rex 3 is significantly larger, thicker, and heavier at 48.5 x 48.5 x 13.75 mm dimensions and 68.3 g weight, while the GTR 4 measures 46 x 46 x 10.6 mm and weighs just 34 g. This makes the GTR 4 more comfortable for daily wear.
Health & Fitness Features
Amazfit GTR 4
The Amazfit GTR 4 and T-Rex 3 equally offer auto recognition of 25 strength exercises and 8 sports, readiness score, Zepp Coach, PeakBeats post-workout analysis, sleep quality monitoring, PAI health assessment, and all-day monitoring of 3 key health metrics (heart rate, SpO2 blood oxygen, and stress levels) which you can also spot-check manually.
However, with 177 sports modes, the T-Rex 3 supports more activities compared to the 154 sports modes on the GTR 4. These additional sports modes on the T-Rex 3 cater to more niche and adventurous outdoor activities, including triathlon, multi-sport, ultramarathon, freediving, surfing, skydiving, paragliding, gravel cycling, and so on.
T-Rex 3 also features a temperature sensor and altitude prompts that will remind you to take blood oxygen measurements when you're hiking at high altitudes. These features, not available in the GTR 4, are useful for adventurous activities in extreme conditions.
In addition, while both smartwatches offer offline maps and route file import for outdoor navigation, only the T-Rex 3 offers a live broadcast of turn directions feature. It displays turn directions on the screen or reads them out loud via connected Bluetooth headphones to guide you during your outdoor activities.
Smartwatch Features
Amazfit T-Rex 3
Basic smartwatch features like phone notifications, phone music control, music storage, morning updates, and camera control for iOS are available on both the Amazfit GTR 4 and T-Rex 3.
Both smartwatches also feature a built-in microphone, which captures your voice when interacting with Zepp Flow, the AI assistant that allows you to control your watch and perform various tasks hands-free.
The GTR 4 also has built-in Amazon Alexa as an alternative voice assistant, but what's the use of it when the Zepp Flow, powered by OpenAI's GPT-4o, is already smart enough to handle most voice commands and queries on both smartwatches?
The more significant advantage of the Amazfit GTR 4 is the built-in speaker. It makes it possible for you to take/make Bluetooth phone calls or play music directly from the watch. Without a speaker, the T-Rex 3 can only view phone call notifications and play music through connected Bluetooth headphones.
Battery Life
Amazfit GTR 4
The Amazfit T-Rex 3 boasts an impressive battery life of up to 27 days in typical usage mode, while the Amazfit GTR 4 can last up to 14 days on a single charge. This significant difference in battery life can be attributed to the T-Rex 3's 700 mAh battery, around 55% larger than the 450 mAh battery in the GTR 4.
However, the GTR 4 charges more quickly. A full charge approximately takes 2 hours, while the T-Rex 3 can take around 3 hours to fully charge.
Amazfit GTR 4 vs T-Rex 3
Final Thoughts
Amazfit T-Rex 3
The Amazfit T-Rex 3 clearly stands out as the more rugged and capable smartwatch, with its military-grade durability, increased water resistance, a wider range of sports modes, and more advanced outdoor-focused features like altitude prompts for blood oxygen tests and live turn-by-turn navigation.
However, the Amazfit GTR 4 is not without its own advantages. Other than offering a more comfortable and lightweight design, it has the convenience of a built-in speaker for phone calls and music playback. Plus, it's much more affordable while still offering key fitness capabilities like sports recognition and various sports modes.
Ultimately, the choice between the two will depend on your specific needs. The Amazfit GTR 4 is a well-rounded smartwatch with fitness and smartwatch capabilities, while the T-Rex 3 is a more specialized outdoor and adventure-focused smartwatch.
If you like to read more on smartwatches, check out our other relevant guides here:
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Amazfit Balance vs GTR 4
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Author
Naila Syifa
Content Manager at Synced. She crafts insightful content on the latest trends in technology, consumer electronics, and smart home gadgets.
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