Eufy Video Doorbell S4 Review: AI Tracking Without the Subscription

Six Weeks With Eufy's Most Ambitious Doorbell

The video doorbell market has been dominated by two subscription-dependent ecosystems for years. Ring wants $5 to $20 per month for cloud recording and AI features. Google Nest charges $8 to $15 per month through Nest Aware for intelligent alerts and video history. Both make excellent hardware, but the long-term cost of ownership adds hundreds of dollars over the life of the device.

Eufy has built its entire brand around the opposite approach: local storage, no monthly fees, and competitive hardware at reasonable prices. The Video Doorbell S4, announced at CES 2026 and launched in March, is the most aggressive expression of that philosophy yet. It brings a feature that no competitor offers at any price: OmniTrack AI, a system that physically rotates the camera to track visitors as they move across your porch.

We installed the Eufy Video Doorbell S4 on our test home and used it as our primary doorbell camera for six weeks. We tested it through rain, wind, night, package deliveries, and an unfortunately enthusiastic raccoon. This review reflects sustained, real-world use.

Design and Installation

The S4 is larger than most doorbell cameras, which is inevitable given the motorized tracking mechanism inside. It measures approximately 6.3 x 2.1 x 1.3 inches, making it taller than a Ring Video Doorbell 4 but not dramatically wider. The matte black finish is understated and blends well with most door frames. It does not scream "smart camera" the way some competing products do.

Installation was straightforward. Eufy provides both battery and wired installation options. We tested the wired setup first, connecting to our existing doorbell transformer. The included angled mounting wedge lets you tilt the camera left or right if your doorbell location does not directly face your walkway, which is a thoughtful inclusion that many competitors lack.

The battery installation is even simpler: mount the bracket, attach the doorbell, and connect to Wi-Fi. The rechargeable battery is removable, so you do not need to unmount the entire doorbell to charge it. Eufy rates battery life at approximately two months with average use, and the optional solar panel accessory can extend that significantly.

Wi-Fi connectivity uses dual-band Wi-Fi 6, which provided a strong, stable connection throughout our testing period. We experienced zero connectivity drops over six weeks, which is notably better than our experience with some Ring products that occasionally lose connection on 2.4GHz networks.

The entire installation process took about 25 minutes for the wired setup, including mounting and app configuration. The battery setup was closer to 15 minutes. Both are within the skill range of anyone comfortable with a screwdriver.

Buy Eufy Video Doorbell S4 on Amazon

Video Quality

The S4 records at 3K resolution (roughly 2880 x 1620) at 24 frames per second, using a 9-megapixel sensor. In daylight, the video quality is excellent. Details are sharp, colors are accurate, and the wide dynamic range handles the tricky contrast between a shaded porch and a sunlit yard surprisingly well.

The 180-degree panoramic field of view, covering both horizontal and vertical axes, is the widest we have tested on any doorbell camera. You can see from the ground directly in front of the doorbell to the street beyond your walkway, with peripheral coverage that extends to both sides of the porch. Package deliveries at your feet, visitors approaching from the side, and delivery trucks at the curb are all visible in the same camera view.

At 3K resolution, there is enough pixel density to zoom into distant details without the image falling apart. We could read license plates on cars parked at the curb about 30 feet away, and facial features were identifiable at distances up to 25 feet. The facial recognition system, which stores face data locally on the device's 64GB eMMC storage, reliably identified household members from about 26 feet away after a brief enrollment period.

Video compression is efficient, and the 64GB of on-board storage held approximately 60 days of event-based recordings in our testing. If you enable 24/7 continuous recording, storage fills up faster, but even then, the S4 manages weeks of footage before needing to overwrite older clips.

OmniTrack AI: The Standout Feature

This is the feature that separates the Eufy Video Doorbell S4 from everything else on the market, and it is genuinely impressive.

OmniTrack AI uses a combination of radar detection, passive infrared sensing, and AI-powered subject recognition to identify when a person enters your camera's field of view. Once detected, the motorized camera mechanism physically rotates to keep the subject centered in the frame as they move. This is not digital panning or cropping within a wide-angle image, which is what Ring and Nest do. This is actual mechanical tracking, with the camera physically following the person.

In our testing, the tracking was remarkably smooth and responsive. When a delivery driver walked up our path, the camera picked them up at the edge of the radar detection zone (about 78 feet away) and began tracking as they entered the camera's visual range. As they walked to the door, placed a package, and walked back to their truck, the camera followed them continuously with minimal stutter or lag.

The tracking handles multiple people reasonably well, prioritizing the closest person to the doorbell. When two visitors arrived together, the camera maintained framing that kept both in view, widening slightly rather than locking onto one subject.

Where OmniTrack AI truly excels is in situations where traditional fixed cameras fail. A standard doorbell camera with a wide-angle lens captures everything but focuses on nothing. The S4 captures a focused, zoomed-in view of the person who matters while maintaining the ability to instantly swivel to track movement. The auto-zoom feature keeps faces at a useful size in the frame, which makes identification dramatically easier than squinting at a small figure in the corner of a wide-angle shot.

The system is not perfect. Rapid direction changes can cause a brief moment of lag as the motor catches up. Animals occasionally trigger the tracking, though the AI usually disengages within a second or two after classifying the subject as non-human. And the mechanical rotation produces a faint whirring sound that is audible if you are standing next to the doorbell, though visitors never mentioned noticing it.

But these are minor criticisms of a feature that fundamentally changes what a doorbell camera can do. After six weeks with OmniTrack AI, going back to a fixed-camera doorbell feels like going back to a flip phone.

Motion Detection

Beyond the tracking system, the S4's motion detection is thorough. The combination of radar and passive infrared sensors means the camera detects motion before it enters the visual frame, giving the tracking system a head start.

Detection range extends to approximately 78 feet for radar and 24 feet for the PIR sensor. In practice, the camera typically begins recording two to three seconds before a person appears in the frame, which means you capture the full context of every visit rather than missing the first few seconds.

The Eufy app lets you define activity zones to limit alerts to specific areas. We set up zones to exclude the sidewalk, which reduced false alerts from passing pedestrians by about 90 percent. The person detection AI is effective at distinguishing humans from animals, vehicles, and tree shadows, though we received occasional false alerts during heavy wind when tree branches moved aggressively near the walkway.

Alert latency was consistently fast in our testing. From the moment a person triggered detection to the notification arriving on our phone averaged about 2.5 seconds on Wi-Fi and 4 seconds on cellular. This is competitive with Ring and slightly faster than Nest in our experience.

Night Vision

Night vision is the S4's weakest area. The camera uses infrared LEDs for standard night vision and a warm spotlight for color night vision. In the spotlight mode, the image quality is good with accurate colors and sufficient detail for identification up to about 15 feet.

However, in areas beyond the spotlight's reach or when using infrared-only night vision, the image quality drops noticeably. Details become muddy, and the effective identification range shrinks to about 12 feet. The infrared illumination is adequate for detecting that someone is present but not always sufficient for identifying who they are at a distance.

Ring's Video Doorbell 4 and Nest Doorbell (battery) both produce brighter, more detailed infrared night vision in our comparative testing. The S4's night performance is acceptable but not best-in-class, and it is the most significant hardware improvement we would like to see in a future revision.

The color night vision mode, which uses the built-in LED spotlight, produces noticeably better results and is our recommended setting for most users. The spotlight serves the dual purpose of illuminating the area and deterring unwanted visitors, and the color footage it produces is far more useful for identification than infrared.

App and Storage

The Eufy Security app provides access to live view, recorded events, camera settings, and device management. It is functional and reliable. It is also visually dated.

The interface uses a design language that feels several years behind Ring and Google Home. Navigation is straightforward but lacks the polish and intuitiveness of competing apps. Finding specific settings sometimes requires digging through menus that could be better organized. The event timeline works well for scrubbing through recordings, but thumbnail previews could be larger and more informative.

Where the app excels is in the absence of subscription upsells. Every feature is available from day one. There are no "upgrade to see your events" prompts, no artificial limitations on video history, and no cloud storage fees. All footage is stored locally on the doorbell's 64GB eMMC storage, and you can export clips to your phone or NAS at any time.

The Eufy HomeBase is not required for the S4, which simplifies the setup compared to some previous Eufy cameras. The doorbell connects directly to your Wi-Fi network, and all storage and processing happens on the device itself.

Two-way audio works well with clear speaker output and effective echo cancellation. The pre-recorded quick responses are useful for greeting delivery drivers without opening the app, and the microphone picks up visitors' voices clearly at conversational distances.

Battery Life

Battery life depends heavily on traffic and settings. In our testing at a moderately busy front door (approximately 15 to 20 motion events per day), the battery lasted about 45 days with default settings. This is shorter than Eufy's estimated two months, likely because OmniTrack AI and 3K recording are more power-intensive than standard doorbell camera operation.

Heavy-traffic locations like apartment buildings or homes on busy streets will see shorter battery life. In our high-traffic test (40-plus events per day), the battery lasted about 25 days.

The wired installation eliminates battery concerns entirely, and we recommend it for anyone with existing doorbell wiring. The solar panel accessory is a good middle ground for homes without wiring that want to avoid frequent charging.

Charging the battery takes approximately three hours via the included USB-C cable. The battery is removable, so you can purchase a second battery and swap them to avoid any downtime.

Comparison to Ring and Nest

vs. Ring Video Doorbell 4

Ring offers a more polished app experience and slightly better night vision. Ring's Neighborhood integration adds community security features that Eufy lacks. However, Ring requires a $5 to $20 per month subscription for video recording and AI features that are free on the S4. Over three years, that subscription costs $180 to $720 on top of the hardware price. The S4's OmniTrack AI has no Ring equivalent, and the 3K resolution exceeds Ring's 1536p output. For buyers who do not want subscriptions, the S4 is the clear winner.

vs. Google Nest Doorbell (Battery)

Nest offers superior smart home integration for Google Home users and a better night vision system. Nest's facial recognition through Nest Aware is polished and reliable. However, like Ring, Nest requires a subscription ($8 to $15 per month) for intelligent alerts and video history. The S4's OmniTrack AI is more capable than Nest's digital zoom, and the local storage model is better for privacy-conscious users. Google Home users may prefer Nest for ecosystem consistency, but the S4 offers better standalone value.

vs. Eufy Video Doorbell E340

The E340 is Eufy's previous flagship, offering a dual-camera system with a separate downward-facing lens for package detection. The S4's single panoramic camera with OmniTrack AI replaces the dual-camera approach and provides more comprehensive coverage. The S4's 3K resolution is also a meaningful upgrade over the E340's 2K output. If you are choosing between current Eufy models, the S4 is the better buy unless you specifically need the E340's lower price point.

Smart Home Integration

The S4 integrates with Amazon Alexa, Google Home, and Samsung SmartThings. You can view the live feed on Echo Show displays and Nest Hub devices, and trigger automations based on doorbell events. The integrations work reliably in our testing, though there is a slight delay (approximately two seconds) when pulling up the live view on smart displays.

Apple Home support is not available at launch, which is a notable omission for iPhone users invested in Apple's smart home ecosystem. Eufy has indicated that Apple Home support is planned for a future firmware update, but no specific timeline has been provided. Given Eufy's history of HomeKit support on other products, we are cautiously optimistic but would not recommend the S4 to anyone who requires Apple Home integration today.

Matter support is also absent at launch, which is disappointing for a 2026 smart home product. This limits the S4's interoperability with the growing ecosystem of Matter-compatible devices and platforms.

The Verdict

The Eufy Video Doorbell S4 is the most innovative doorbell camera we have tested in 2026. OmniTrack AI is not a gimmick. It fundamentally changes the usefulness of doorbell camera footage by actively tracking visitors rather than passively recording a static wide-angle view. The 3K resolution, 180-degree panoramic coverage, and local storage with no subscription fees make the S4 the best value proposition in the doorbell camera market.

The app needs a visual overhaul, night vision could be brighter, and the absence of Apple Home and Matter support at launch is frustrating. Battery life in high-traffic areas may require more frequent charging than some users would prefer.

But the core question for any doorbell camera is: does it show you who is at your door, clearly and reliably? The Eufy Video Doorbell S4 does that better than any doorbell we have tested, and it does it without asking you to pay monthly for the privilege. At $279.99, the S4 earns a strong recommendation.

Buy Eufy Video Doorbell S4 on Amazon