Sixmou i3 4K Thumb Action Camera, Tiny Size, Mount vs SJCAM C400 Vlogging Camera,
Updated August 2026 — Sixmou i3 4K Thumb Action Camera, Tiny Size, Mount wins on portability, SJCAM C400 Vlogging Camera, wins on stabilization and features.
The SJCAM C400 offers superior features and performance, making it the better choice for serious vloggers, while the i3 is a great budget option for casual users.
Why Sixmou i3 4K Thumb Action Camera, Tiny Size, Mount is better
Price
The i3 is significantly cheaper at $73.99.
Portability
The i3 is smaller and lighter, weighing only 1.25 ounces.
Mounting
The i3 has a magnetic design for easy mounting.
Why SJCAM C400 Vlogging Camera, is better
Image Quality
The C400 offers 4K Ultra HD resolution.
Battery Life
The C400 provides up to 7 hours of recording.
Stabilization
The C400 features a 6-axis stabilization system.
Overall score
Specifications
| Spec | Sixmou i3 4K Thumb Action Camera, Tiny Size, Mount | SJCAM C400 Vlogging Camera, |
|---|---|---|
| Video Quality | 4K | 4K |
| Touch Screen | No | Yes |
| Wide Angle | No | 154° |
| Mounting Options | Magnetic | Standard |
| Recording Modes | Basic | Multiple |
Dimension comparison
Overview of the i3 4K Thumb Action Camera
The i3 4K Thumb Action Camera is a compact and lightweight option, priced at $73.99. Weighing just 1.25 ounces, it is designed for portability, making it ideal for those who want to capture action without the bulk of traditional cameras. The i3 features a magnetic design allowing it to be mounted easily on various surfaces, including a quick attachment to your body or gear. It also offers impressive underwater capabilities, being waterproof up to 131 feet when housed in its case, making it suitable for diving and other water sports.
Overview of the SJCAM C400 Vlogging Camera
The SJCAM C400 Vlogging Camera comes at a significantly higher price of $199.00 but offers a range of advanced features tailored for vloggers. This camera provides 4K Ultra HD resolution, a 154° wide-angle lens, and a 6-axis stabilization system, ensuring high-quality video output even in dynamic environments. A standout feature is its extensive battery life, offering up to 7 hours of continuous recording, making it suitable for all-day vlogging sessions. The C400 also allows for wireless control, adding flexibility to your shooting experience.
Price Comparison
In terms of price, the i3 4K Thumb Action Camera is about 63% cheaper than the SJCAM C400 Vlogging Camera. At $73.99, it offers a budget-friendly option for casual users or those new to action cameras. On the other hand, the SJCAM C400, priced at $199.00, targets more serious vloggers willing to invest in higher-quality features. The price difference may reflect the advanced capabilities of the C400, but for users seeking a simple, effective camera, the i3 provides exceptional value.
Image Quality and Performance
The SJCAM C400 clearly outshines the i3 in terms of image quality, offering 4K Ultra HD resolution with a distortion-free wide-angle lens. This makes it ideal for capturing expansive landscapes and detailed shots. In contrast, while the i3 also supports 4K recording, its emphasis is on portability rather than professional-grade image quality. The C400's advanced features, including a large aperture for better low-light performance and 6-axis stabilization, ensure clearer and more stable footage, especially useful for dynamic vlogging scenarios.
Battery Life
The i3 4K Thumb Action Camera offers a respectable battery life of up to 150 minutes in 1080P mode, which is sufficient for short outings. However, the SJCAM C400 stands out with an impressive 7 hours of continuous recording time, making it ideal for long events or full-day vlogging. This extended battery life can be a game-changer for users who need to capture numerous moments without the hassle of frequent recharging, making the C400 a more practical choice for serious content creators.
Mounting and Portability
Portability is a significant strength of the i3 4K Thumb Action Camera, which weighs only 1.25 ounces and is designed to be mounted almost anywhere. Its magnetic features and various mounting accessories allow for quick and flexible attachment to different surfaces, making it perfect for active users on the go. Conversely, while the SJCAM C400 is also portable, it is larger and heavier, which may limit how discreetly it can be carried. For those who prioritize a compact design for spontaneous shooting, the i3 clearly excels.
User Experience
The user experience with the SJCAM C400 is enhanced by its 2.29-inch touch screen and advanced connectivity options, including 5G WiFi for fast data transfer. This allows for real-time previews and easy sharing of footage, which can greatly benefit vloggers looking to engage with their audience. The i3 lacks such advanced user interface features, focusing instead on simplicity and ease of use. This makes the C400 more appealing for those who value a more interactive filming experience, while the i3 may suit users who prefer straightforward functionality.
Which should you buy?
Choosing between the i3 4K Thumb Action Camera and the SJCAM C400 Vlogging Camera ultimately depends on your specific needs. If you are looking for a highly portable, budget-friendly action camera for casual use, the i3 offers excellent value at $73.99. However, if you are a serious vlogger needing advanced features, superior image quality, and extended battery life, the SJCAM C400, priced at $199.00, is worth the investment. Each camera serves distinct purposes, making it essential to consider what features matter most to you.

