Willow Go vs Eufy S1 Pro: The Ultimate Wearable Breast Pump Showdown

The Pumps: Established Leader vs Innovative Challenger

Let’s Address the Elephant in the Room: The Price-to-Value Equation

Before we dive into features, let’s talk money. The Willow Go retails for around $329-349 without any extras. That’s it. No charging case, no display, no warming features. What you see is what you get.

The Eufy S1 Pro comes in two versions: $239.99 without the charging case, or $349.99 with it. Here’s where this gets interesting—at the lower price point, you’re getting MORE features than the Willow Go (LED display, heating technology, better app) for $90-110 less. At the higher price point, you’re paying essentially the same but getting significantly more functionality.

From a pure value perspective, the Eufy S1 Pro offers more bang for your buck at both price points. However, value isn’t just about features on paper—it’s about reliability, brand reputation, and whether those extra features actually matter for your specific situation. Let’s dig deeper.

Side-by-Side Comparison: Willow Go Vs Eufy S1 Pro

The App Experience: Where Eufy Absolutely Crushes It

I need to be blunt here: the Willow app is frustratingly unreliable. I’ve lost count of how many times it refused to connect, forgot my saved settings, or disconnected mid-session. It’s not that the app doesn’t work—it does, eventually—but the experience is clunky and inconsistent. Multiple reviews echo this frustration, with many moms reporting they just gave up on using the app altogether and control everything manually via the pump buttons.

The Eufy Baby app is the complete opposite. It’s smooth, responsive, and genuinely smart. Connection is instantaneous, settings are remembered reliably, and the interface is modern and intuitive. The app allows you to control both suction AND heat simultaneously, set pre-warming timers (genius for triggering faster letdown), and access four different pumping rhythms that go beyond simple stimulation/expression modes.

Here’s the real kicker: the Eufy app can handle multiple Eufy pumps simultaneously if you own different models. The Willow app struggles to maintain connection with one pump, let alone multiple devices. For tech-savvy moms who want actual app control (not just the promise of it), the Eufy wins this category hands down.

Vibration Features: Intense vs Refined

Both pumps include vibration to help stimulate letdown, but they take wildly different approaches. The Willow Go’s vibration is mechanical, intense, and always on. You can’t turn it off or adjust it. Some moms love the aggressive stimulation and credit it with better letdown. Other moms find it distracting, uncomfortable, or even irritating. There’s no middle ground—you either vibe with the vibration or you don’t.

The Eufy S1 Pro features gentle, refined vibration that acts more like a subtle background sensation. It’s there if you pay attention, but it’s not demanding your attention. Think of it as the difference between a massage chair on high versus a gentle kneading setting. For most moms, the Eufy’s subtler approach is less fatiguing during longer sessions or multiple daily pumpings.

HeatFlow™ Technology: Is It Worth the Hype?

Let me address this directly: the Eufy S1 Pro’s heating feature is NOT a gimmick. This is genuine, intentional warmth designed to improve your pumping experience and milk output. With seven adjustable heat levels (95°F to 105°F), you can customize the temperature to your comfort level.

Clinical evidence and overwhelming user feedback suggest this warming can increase milk output by up to 30% for many moms. More importantly, the gentle heat helps prevent clogged ducts—a painful problem I personally struggled with before finding pumps with warming features. The heat helps milk flow more freely and can make a significant difference for moms with slow letdown or frequent blockages.

The Willow Go has zero heating functionality. If your Willow Go feels warm, that’s actually a warning sign of a charging or electrical issue, not a feature. For moms who struggle with clogged ducts or need help with letdown, this alone might make the Eufy S1 Pro worth choosing.

Assembly, Cleaning & The “Fridge Hack” Reality

Willow Go: More Complicated Than It Should Be

The Willow Go has multiple internal parts that must be aligned precisely for proper function. The duckbill valve is particularly finicky—it needs to seat perfectly on the white backing plate. During my testing, I noticed a significant issue with the popular “fridge hack” (storing assembled pump parts in the refrigerator between sessions to avoid repeated washing).

When refrigerated, the duckbill often loses its proper seat, causing suction problems. This means you can’t reliably do the fridge hack with the Willow Go—you’ll need to check and potentially reassemble before each session. For busy moms trying to minimize cleaning time, this is frustrating.

That said, the actual cleaning is straightforward because the parts are larger and easier to handle. Everything comes apart clearly, and you can visually confirm parts are clean. The components are also dishwasher safe, which is convenient.

Eufy S1 Pro: Simple and Intuitive

The Eufy features fewer parts overall, and they click together intuitively without requiring precise alignment gymnastics. Assembly takes seconds once you’ve done it once. The fridge hack works reliably with the Eufy—parts maintain their positioning even after refrigeration.

Cleaning is equally straightforward, though the parts are slightly smaller than Willow’s. Everything is intuitive to disassemble and reassemble, which matters when you’re doing this 4-6 times daily.

Design Philosophy: Shape, Fit & Bra Compatibility

This is where personal preference really matters. The Willow Go features a unique design with the motor positioned on the backside and collection container on the front. This creates a bottom-heavy, elongated profile. While it appears slimmer at first glance, many users report it actually sits deeper in the bra and requires significant support.

Finding the right bra for the Willow Go is crucial. The pump needs a structured, supportive nursing or pumping bra—soft, stretchy bras often don’t provide enough stability. The bottom-heavy design can cause the pump to sag or shift without proper support, which affects suction and comfort.

The Eufy S1 Pro takes a completely different approach with its rounded, pod-like design. The weight is more evenly distributed, making it easier to fit in a wider range of bras. The rounder shape sits flatter against the breast with a lower profile that’s often more discreet under clothing. Multiple lactation consultants have noted the Eufy is one of the easiest large wearable pumps to fit properly.

For reference, I’m a 36DD, and I found the Eufy significantly easier to position and keep stable. The Willow Go required more adjustment and a very specific bra style to stay comfortable throughout pumping sessions.

Battery Life & Charging: The Eufy’s Game-Changing Case

Both pumps offer approximately 3 pumping sessions per battery charge when used on their own. For most moms pumping 4-6 times daily, this means daily charging is necessary with either pump’s base battery.

Here’s where the Eufy S1 Pro completely changes the game: the wireless charging case. This isn’t just convenient storage—it’s a portable power bank that extends your total battery life to approximately 5 days of regular pumping. You simply drop your pumps in the case after each session, and they automatically recharge for next time.

For frequent travelers, business moms, or anyone who hates the daily charging routine, this is transformative. The case eliminates the anxiety of forgetting to charge overnight and means you can go an entire work week without finding an outlet.

The Willow Go uses standard USB-C charging (no case option), which is fine for home use but less convenient for travel. You’ll need to remember to charge it daily, and you’ll need access to a charging port.

Noise Level: Both Excel, Willow Edges Ahead Slightly

Good news: both pumps are remarkably quiet and suitable for discreet pumping in professional settings. The Willow Go is the quieter of the two—so quiet that some users report thinking it stopped working because they couldn’t hear it. It produces an extremely soft, muffled sound that won’t draw attention even in library-quiet environments.

The Eufy S1 Pro operates at ≤46 dB, which is still very quiet—comparable to a whisper or gentle conversation. The difference between the two pumps’ noise levels is minimal in real-world use. Both can be worn during video calls (camera off), in quiet offices, or in professional meetings without anyone noticing.

If absolute silence is your top priority and you’re pumping in extremely quiet environments regularly, the Willow Go has a slight edge. For most situations, both pumps perform excellently in this category.

What Real Moms Are Saying: Unfiltered Feedback

I’ve scoured hundreds of reviews, participated in pumping Facebook groups, and interviewed dozens of moms who’ve used both pumps. Here are the recurring themes:

Common Willow Go Praise

“I love how quiet it is—I can pump during meetings and no one knows.” This is the most common praise. Moms consistently rave about the whisper-quiet operation.

“I get the same output as my Spectra S1.” Many users report excellent milk output that matches their traditional hospital-grade pumps, which is impressive for a wearable.

“Willow’s customer support is amazing.” The established brand offers 24/7 support, and multiple moms mentioned receiving quick, helpful responses to issues.

Common Willow Go Complaints

“The app is a disaster. I gave up using it.” This is overwhelmingly the most frequent complaint. Connection issues frustrate users regularly.

“Assembly is confusing and the duckbill valve is finicky.” First-time setup takes patience, and the duckbill positioning is a recurring source of frustration.

“It’s heavy in my bra and keeps sagging.” Moms with larger breasts especially struggle to find proper support for the bottom-heavy design.

Common Eufy S1 Pro Praise

“The heating feature is a game-changer for my clogged ducts.” Moms who struggle with blockages consistently mention the warming as a major benefit.

“The app actually works! It’s so smooth and reliable.” The superior app experience gets mentioned in almost every positive Eufy review.

“The charging case is worth every penny—I can go all week without plugging in.” Business travelers and busy moms love the extended battery convenience.

Common Eufy S1 Pro Complaints

“It’s heavier than I expected.” The pump’s weight is noticeable, especially for smaller-framed moms or those with smaller breasts.

“I wish it came with a 7 oz cup option.” High-output moms appreciate Willow’s larger capacity choice.

“Replacement parts are hard to find.” The newer brand doesn’t have the same extensive supply chain as Willow.

Getting Your Pump Through Insurance: What You Need to Know

Both the Willow Go and Eufy S1 Pro qualify for insurance coverage under the Affordable Care Act. Most health insurance plans are required to cover breast pumps at no cost or with minimal cost-sharing. However, coverage details vary significantly by plan and provider.

The Willow Go, being more established, is widely available through most insurance DME partners. You’re more likely to find it fully covered or available with a small upgrade fee through your specific insurance provider.

The Eufy S1 Pro’s insurance availability is expanding rapidly but may still be limited with some carriers. However, when it IS covered, it’s often available at a lower out-of-pocket cost than the Willow Go due to its base price being lower.

Here’s my recommendation: Start by checking which pumps your specific insurance plan covers. Get quotes for both pumps. If both are available, consider paying an upgrade fee for the Eufy S1 Pro if your plan offers it—the additional features often justify the small extra cost. If Willow is fully covered and Eufy requires significant out-of-pocket expense, the Willow Go becomes more attractive.

For comprehensive guidance on navigating insurance coverage and maximizing your benefits, check out our detailed resource: How to Get a Free Breast Pump Through Insurance.

Your Questions Answered: Willow Go vs Eufy S1 Pro

The Verdict: Which Pump Should You Actually Buy?

After three months of extensive real-world testing, the Eufy S1 Pro with charging case emerges as my top recommendation for most moms in 2026. Here’s why: it simply offers more value, more innovative features, and better daily usability for the same price (or less) than the Willow Go.

The HeatFlow™ warming technology alone makes a significant difference if you’ve ever struggled with clogged ducts or slow letdown—and let’s be honest, most pumping moms deal with these issues at some point. The revolutionary charging case transforms the daily pumping routine by eliminating constant charging anxiety. The superior app experience means you can actually use the smart features instead of fighting with buggy software. The LED display, OptiRhythm modes, and simpler assembly all contribute to a more pleasant daily experience.

However, the Willow Go absolutely deserves consideration for specific situations. If you pump in extremely quiet professional environments where even whisper-level noise matters, the Willow’s near-silent operation is genuinely superior. If you value the security of an established brand with proven reliability and excellent customer support, Willow’s market leadership matters. If you’re a high-output mom who needs 7 oz capacity per side, Willow offers that option while Eufy doesn’t. And if the Willow is fully covered by your insurance while the Eufy requires significant out-of-pocket cost, that changes the value equation entirely.

Have you tried the Willow Go or Eufy S1 Pro? I’d genuinely love to hear about your experience! Drop a comment below sharing which pump you chose and how it’s working for you. Your real-world insights help other moms make informed decisions on their pumping journey. And remember—you’re doing an incredible job feeding your baby, no matter which pump you choose. The fact that you’re here researching and making thoughtful decisions shows what an amazing mom you are. Happy pumping! 💕