The modern market of wearable electronics is saturated with offers, but it is the Mi Band line from Xiaomi that has been setting the standards for available activity trackers for more than a decade. Consumers often find it difficult to understand the intricacies of generation numbering, because devices may seem similar, but the technical content changes dramatically. The choice between the old and new model can be a decisive factor in the comfort of using the gadget for several years.
The main difference lies not only in the release date, but also in the technologies used in the display, sensor accuracy and software capabilities. OLED-full-color screen AMOLED-It was at this point that we split the lineup into simple pedometers and full-fledged entry-level smartwatches.
In this article, we will discuss in detail what the Xiaomi Mi fitness bracelet differs from different years of release so that you can make an informed decision about buying. We will analyze the evolution of functionality, changes in the design of capsules and straps, and discuss compatibility with modern smartphones. Understanding these nuances will help to avoid the disappointment of buying an outdated device.
Evolution of capsule design and form factor
The first thing that catches your eye when comparing models is the change in size and shape of the main module. Early versions, such as the Mi Band 1S and Mi Band 2, had an elongated oval shape that often interfered with wearing under the shirt cuff. Xiaomi engineers gradually reduced the size of the tracker, making it more compact and ergonomic.
Since the Mi Band 4, the design has been revolutionary, with the capsule shorter and wider, allowing us to increase the usable screen area without significantly increasing the overall dimensions, and allowing for full touch control, replacing the capacitive button that was typical of previous generations.
The versatility of the mounts is worth noting: models from the first to the third used a specific mechanism for fixing the tracker in the strap, which was often criticized for the difficulty of extraction. In newer versions, especially in the Mi Band 5 and later, a quick removable system was introduced, allowing you to change the straps in seconds without risking damage to the body.
⚠️ Warning: When buying straps, pay attention to compatibility.Mi Band fasteners 1-3 not suitable for models 4-8, And vice versa. There's no one-size-fits-all solution in this lineup.
The materials of the case also evolved, and while the first generations had a glossy plastic surface that was quickly covered with micro-scratches, the Mi Band 6 and Mi Band 7 began to use more resistant polymers and protective coatings, which significantly affected the longevity of the device's appearance when used actively.
Display technology: from monochrome to Always On
The screen is the main interface for interaction with the device, and here the generational difference is most noticeable. OLED-They were low-resolution displays, and they were shown in segments or simple pixels, which was enough to see the time and steps, but no more.
With the release of Mi Band 4, the industry has stepped forward. AMOLED-The 0.95-inch screen provided high contrast and color saturation, and it introduced the rich dials that became the hallmark of the series. The brightness and readability in the sun also improved significantly.
Recent models, such as the Mi Band 7 Pro and Mi Band 8, have introduced Always-On Display technology, which means that the screen does not go out completely, but only reduces brightness, showing time in energy-efficient mode, and the user no longer needs to make a characteristic swinging of his hand to see the time.
The resolution of the matrix has also increased with each generation, and if the Mi Band 4 had 120x240 pixels, the Mi Band 8 already had 192x490 pixels, and the density of pixels makes the fonts clear and the interfaces smooth and pleasing to the eye.
Health sensors and measurement accuracy
The main function of any tracker is to monitor your body's performance, and the early models (Mi Band 1-2) used simple optical sensors that often gave you errors under dynamic loads, and they could measure your pulse, but they didn't have to talk about accuracy.
That changed with the introduction of second- and third-generation PPG sensors in the Mi Band 3 and Mi Band 4, which not only stabilized pulse measurements, but also enabled sleep phase tracking, and the algorithms learned to distinguish between deep and light sleep, albeit with some degree of convention.
Mi Band 5 and later have an expanded sensor suite, a blood oxygen sensor (SpO2) that has become particularly relevant in recent years, and improved accelerometer and gyroscope performance, allowing more accurate identification of physical activity.
- 🏃♂️ Tracking training: New models support more 100 sports regimes against 5-7 early-stage.
- 💤 Sleep analysis: Modern algorithms take into account daytime sleep and even assess the quality of breathing during rest.
- 🩸 Stress monitoring: A function that has emerged in recent generations analyzes heart rate variability.
It is important to understand that no fitness bracelet, including top Xiaomi models, is a medical device, and data obtained from the Mi Band 6 or Mi Band 7 are suitable for general monitoring of the condition, but not for diagnosis.
Autonomy and charging systems
The issue of power consumption has always been a hot topic, especially with the growth of functionality and brightness of screens. Paradoxically, despite the advent of color displays, the autonomy of devices has not decreased, but also increased due to the optimization of processors and the introduction of more capacious batteries.
The first models (Mi Band 1-2) could last up to 20-30 days, but their functionality was extremely limited. Modern Mi Band 7 and Mi Band 8 with active use (constant monitoring of pulse, notifications, training) keep the charge 10-14 days, which is an excellent indicator for color AMOLED.
The charging system changed, too. The older versions required taking the tracker out of the strap and inserting it into a special dock charger, which was uncomfortable and worn out, and starting with the Mi Band 6, a magnetic charging connector was introduced that allows you to charge the device without removing it from the strap.
☑️ Check before buying a used bracelet
The charging speed has also increased. If the full cycle for the Mi Band 3 took about 2 hours, the new magnetically charged models restore capacity in 40-60 minutes, which allows you to quickly "power" the gadget before training, if you forgot to put it on charge at night.
Functionality and ecosystem
The software gap between generations is enormous: older models worked as passive data receivers, synchronizing with the phone only when an app is opened. Modern Mi Bands are full-fledged smart devices with the ability to install mini-apps and widgets.
The key difference was the presence of a module. NFC This allows you to use the device for contactless payment (in supported regions) or as a digital key. NFC-versions are often regionally based and may not work outside the country of purchase.
Integration with voice assistants has also changed, and while previously you could only see notifications, now the Mi Band allows you to respond to messages with template phrases, control music on your smartphone, and even make calls (in models with a speaker and microphone, for example, the Mi Smart Band 7 Pro).
⚠️ Attention: Function NFC It only works in conjunction with specific applications and regions, and the global version of the bracelet may not support China's payment systems, and vice versa.
The Mi Fit ecosystem and Mi Fitness have also split, and newer models often require the installation of a fresh Mi Fitness app, which has a different interface and logic than the old Mi Fit, which can cause confusion among users who switch from older models.
Comparative Characteristics Table
So for the sake of ease of perception, we've developed a composite table that shows the evolution of key parameters across generations of devices, and it's going to help you navigate the technical details quickly.
| Characteristics | Mi Band 3 | Mi Band 5 | Mi Band 7 | Mi Band 8 |
|---|---|---|---|---|
| Screen. | 0.78" OLED | 1.1" AMOLED | 1.62" AMOLED | 1.62" AMOLED |
| Permission | 128x80 | 126x294 | 192x490 | 192x490 |
| SpO2 sensor | No. | No. | There is. | There is. |
| Charging. | Removable tracker | Magnetic | Magnetic | Magnetic |
| Waterproofing | 5 ATM | 5 ATM | 5 ATM | 5 ATM |
As you can see from the table, the jump in display quality occurred between the third and fifth generations, with the seventh and eighth versions focusing on improving existing settings, increasing screen area and adding new modes of operation, such as Continuous Display mode.
Criteria for choosing the current model
When choosing a device today, it makes no sense to look at models older than the Mi Band 5, unless the budget is critically limited. The price difference between a new and used device three years ago is minimal, and the difference in experience is huge.
If you want maximum battery life and minimalism, you can look at the Mi Band 6. This is the middle ground, where there is already a color screen and magnetic charging, but there are no redundant features that can distract. For athletes, the best choice will be the Mi Band 7 or Mi Band 8 models with their extended metrics and the best models. GPS-tracking (via phone).
Should I Buy the Mi Band 4 in 2026?
Smartphone compatibility is also worth considering. The latest features may require Android 6.0 or iOS 12.0 and higher to work. Make sure your main device supports the required versions of operating systems.
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When buying, look for the firmware version (CN or Global). Chinese versions (CN) may have limitations in the interface language and notifications on some smartphones.
To sum up, Xiaomi has managed to create a product that evolves without losing its availability, with each generation bringing real improvements, not just marketing ploys.
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The best choice in terms of price / quality / function at the moment are the Mi Band 7 and Mi Band 8 models, as they have a full set of modern sensors and a modern design.