Eufy S1 Pro vs Momcozy M6
If you’re torn between the Eufy S1 Pro and the Momcozy M6, you’re not alone. These two wearable breast pumps are both high-performing, hands-free options—but they go about things in very different ways.
The Eufy S1 Pro is sleek, smart, and packed with premium features like app control, heat flow technology, and a rechargeable carry case. On the other hand, the Momcozy M6 keeps things simple with onboard controls, great suction, and an impressively long battery life—at a much lower price point.
So, which one is the better fit for your pumping routine?
In this Eufy S1 Pro vs Momcozy M6 comparison, I’ll walk you through the pros and cons of each pump, from suction strength and comfort to flange design, battery life, noise levels, and price—so you can decide which one really meets your needs.
Prefer to watch? My full video comparison is just below. Prefer to read? Keep scrolling for the full written breakdown.
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Similarities and Differences
At a surface level, the Eufy S1 Pro and Momcozy M6 are both in-bra wearable breast pumps designed for hands-free convenience and portability.
Both offer hospital-grade suction, closed system designs, multiple modes, and comfortable flange options.
But despite these similarities, there are some key differences that set these pumps apart—particularly when it comes to app integration, heat technology, battery performance, and overall ease of use.
So, let’s take a closer look with my Eufy S1 Pro vs Momcozy M6 comparison!
Pump Design
When it comes to design, both the Eufy S1 Pro and Momcozy M6 are fully in-bra wearable pumps—but they differ quite a bit in shape and fit.
The Eufy S1 Pro has a smooth, rounded pod-like design with a minimalist look. It sits low and close to the chest, offering a snug and streamlined fit under clothing. The overall feel is discreet, and it stays in place well during movement or multitasking.
The Momcozy M6 takes on more of a teardrop shape that’s designed to mimic the natural curve of the breast. This breast-like silhouette helps it sit more comfortably and securely in your bra, while also making it less bulky under clothing.
One design feature I really like about the M6 is the way the flange connects—it uses a simple push-in fit at the back of the collection cup, which is quicker and easier to manage than pumps that rely on fold-over seals.
Both pumps have a short flange tunnel, which helps keep the profile compact. That said, moms with elastic nipples may find the limited tunnel space less ideal for longer sessions.
Pumping Modes and Suction Levels
Both the Eufy S1 Pro and Momcozy M6 deliver hospital-grade suction, with the Eufy offering up to 300mmHg and the M6 close behind at 295mmHg. That means you’re getting strong, effective suction with either pump—but the way you control that suction is quite different.
The Momcozy M6 features three built-in modes—stimulation, expression, and mixed—all accessible directly on the pump’s interface. It also includes nine suction levels, giving you plenty of flexibility to find the right balance between comfort and output. Having everything available on the pump itself is great if you want something simple and self-contained, with no need for an app.
The Eufy S1 Pro includes just two modes on the pump: stimulation and expression. However, once connected to the Eufy Baby app, you unlock four additional preset rhythms such as Max Output and Natural Flow, along with custom cycle settings and session timers. The app also lets you control the built-in heat flow technology, which offers seven heat levels designed to support letdown and prevent clogged ducts.
* Excludes new releases
If you want total control over suction patterns and benefit from warmth during pumping, the Eufy S1 Pro offers a more advanced, app-driven experience. If you prefer simplicity and having everything in one place, the Momcozy M6 makes pumping straightforward without sacrificing performance.
If you’re looking for a pump with app integration and not sure whether to go with Eufy or Momcozy, check out my full comparison of the Eufy S1 Pro vs Momcozy M9.
Collection Containers
Both the Eufy S1 Pro and Momcozy M6 use built-in collection cups, but differ slightly in capacity and ease.
The Eufy holds up to 5oz (150ml), while the M6 offers a bit more at 6oz (180ml) which is a helpful bonus if you’re an oversupplier or want to avoid mid-session emptying.
You’ll need to transfer milk after each session with both pumps, but if capacity matters, the M6 has a slight edge.
Flange Design
When it comes to comfort, both the Eufy S1 Pro and Momcozy M6 offer thoughtful flange designs—but they take different approaches.
The Momcozy M6 features a 90° flange angle with a hard silicone base and soft silicone rim. It also uses Momcozy’s Double Fit Flange, which provides both cushioning and a more secure seal around the breast. This extra seal helps improve suction and minimize air leaks, which can boost milk output. The flange clicks into the cup with a simple push-fit connection that’s easy to assemble and clean.
The Eufy S1 Pro steps it up with a 105° flange angle, designed to better mimic the angle of a baby’s latch. This more natural alignment can help reduce pressure and increase comfort, especially during longer sessions. The flange has a soft, velvety silicone feel and a flip-over seal, which adds a snug fit but can be a bit trickier to attach.
Both the Momcozy M6 and Eufy S1 Pro come with 24mm flanges plus 17mm, 19mm, and 21mm inserts for a more personalized fit.
Battery Life and Charging
Battery life is one of the biggest differences between the Eufy S1 Pro and Momcozy M6—and each one has its own strengths.
The Momcozy M6 offers up to 180 minutes of use per charge, which can cover around nine 20-minute sessions. It charges fully in about 1.5 hours via USB-C, which makes it a great choice if you want a long-lasting pump that’s ready to go after a short recharge. For a wearable pump at this price point, the battery performance is impressive and more than enough to get most moms through a day or two without worry.
The Eufy S1 Pro has a shorter battery life on its own—typically around five sessions per charge—but what really sets it apart is the rechargeable carry case. This case stores and recharges your pumps between sessions, giving you up to five days of total use without needing to plug in. Just drop the pumps into the case, wait for the light to come on, and they’ll be charged and ready for your next session.
Both pumps use USB-C charging, but the Eufy’s smart case adds serious convenience—especially for busy or traveling moms who want a power solution that works in the background without daily recharging.
LED Screen and App Experience
The Momcozy M6 features a full LED screen with clear readouts for suction level, mode, battery status, and an inbuilt timer. Everything is controlled directly from the pump, making it easy to use on the go without needing your phone.
The Eufy S1 Pro, on the other hand, doesn’t have a traditional LED screen. It shows limited visual feedback—like suction level dots and heat setting indicators—but there’s no timer or battery display. Most of the pump’s features, including suction customization, session tracking, and heat control, are accessed through the Eufy Baby app.
So while the Eufy offers advanced app-based control, the Momcozy M6 gives you full visibility and control right on the pump itself—ideal if you want a more self-contained, phone-free experience.
Cleaning & Sterilization
The Momcozy M6 parts require hand washing and are not safe for the dishwasher or UV sterilizers. While the parts are fairly easy to clean due to the simple push-fit design, it does add a bit of extra effort for busy moms who are pumping multiple times a day.
The Eufy S1 Pro parts can’t be microwaved, but they can be steam sterilized, which makes keeping them hygienic a little easier. The components also have a more premium feel and are designed to handle frequent sterilization without warping.
Both pumps need to be washed after each use, but if having sterilizer compatibility is a priority, the Eufy S1 Pro offers a slight edge.
Noise Levels
Both the Eufy S1 Pro and Momcozy M6 are quiet enough for discreet pumping.
The M6 runs at around 50dB, while the Eufy S1 Pro is slightly quieter at 46dB. It’s a small difference, but if you’re sensitive to noise or pumping in quiet spaces, the Eufy has a slight edge.
Price and Value
The Momcozy M6 comes in at $229 USD, making it one of the more affordable wearable pumps with hospital-grade suction. For that price, you’re getting excellent core features—three pumping modes, nine suction levels, long battery life, and a hard-shell carry case. It’s a great option if you want strong, reliable performance without needing app connectivity or extra frills. The value here comes from simplicity, ease of use, and durability at a lower cost.
The Eufy S1 Pro, priced at $350 USD, sits at the premium end of the market—and it shows. The value lies in its advanced features: app integration for full control, multiple pre-set rhythms, heat flow technology, and the standout rechargeable carry case that can keep your pump powered for up to five days. It’s designed for moms who want convenience, comfort, and customization all in one.
* Excludes new releases
While the Eufy S1 Pro costs more, it offers a more hands-off, smart experience. The Momcozy M6 delivers excellent performance and longevity for a lower price. Both pumps offer great value—depending on your budget and what features matter most to you.
The Verdict
So, which pump is right for you? Here’s a quick breakdown to help you decide based on what matters most to your pumping routine.
Choose the Momcozy M6 if:
- You want a reliable, budget-friendly pump with strong suction
- You prefer simple, on-device control without needing an app
- Long battery life and quick USB-C charging are top priorities
Choose the Eufy S1 Pro if:
- You want premium features like built-in heat to help with letdown and clogs
- You like controlling and customizing your sessions through an app
- You want the convenience of a rechargeable carry case with multi-day battery life
Whichever pump you choose, you’re getting a thoughtfully designed, wearable breast pump that makes pumping more comfortable, convenient, and hands-free.
Think either the Eufy S1 Pro or Momcozy M9 is the right pump for you?
Use the code: PUMPINGMILK at the Momcozy checkout to get 15% off.
Use the code: PUMPINGPD at the Amazon checkout to get 10% off (M6).
Use the code: PMilkeufy at the Eufy checkout to get 16% off site wide (excludes accessories & new releases)
