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Key takeaways
- Design: the Elvie Pump, Willow Go and Willow 360 are fully in-bra. The Elvie Stride has two in-bra cups and a hub that clips to a belt or clothing.
- Suction: Willow Go lists up to 295 mmHg per side, Elvie Stride up to 300 mmHg in a single-cup setup, Willow 360 up to 245 mmHg. Elvie Pump doesn't publish one.
- Willow says only the 360 has its leak-proof latch, and the Go uses a different container design. Treat every leak and spill statement as the maker's claim.
- Battery per charge: Willow Go up to 8 sessions, Willow 360 up to 5, Elvie Pump 5 to 6, and Elvie Stride nearly 3 hours.
- Insurance: Aeroflow and Byram describe the Elvie and Willow Go pumps as upgrades with an out-of-pocket cost. Ask your supplier for the exact fee.
At a glance
Elvie Pump and Elvie Stride
Suits: Parents who want a quieter-by-claim pump (Pump) or a hub-and-cups setup with higher published suction (Stride).
- Strength: Elvie Pump claims 32 dB
- Strength: Both are app-controlled
- Strength: Elvie calls its pumps closed systems
- Trade-off: Elvie Pump doesn't publish maximum suction
- Trade-off: Stride's hub sits outside the bra
- Trade-off: Suppliers list both as insurance upgrades
Willow Go
Suits: Parents who want the longest listed battery and 7-ounce container option in this pair, and an in-bra pump.
- Strength: Up to 295 mmHg per side and 15 levels
- Strength: Up to 8 sessions per charge
- Strength: Fully in-bra, app-controlled
- Trade-off: Reusable containers only
- Trade-off: No Apple Watch control
- Trade-off: Aeroflow and Byram list it as an upgrade
Willow 360
Suits: Parents who care most about Willow's leak-proof latch and milk bags, and who accept lower suction and a shorter battery.
- Strength: Willow calls it 100% leak-proof with milk bags
- Strength: Works with bags or reusable containers
- Strength: Apple Watch control
- Trade-off: Up to 245 mmHg and 7 levels
- Trade-off: Up to 5 sessions per charge
- Trade-off: Aeroflow lists Willow pumps as upgrades
Elvie and Willow are the two names most people mean by "app-controlled wearable pump," and they work differently. The Elvie Pump and Willow's Go and 360 sit fully inside the bra [1][4][5]. The Elvie Stride keeps its cups in the bra and its hub outside [2]. This guide compares the Elvie Pump and Stride with the Willow Go and Willow 360 on what each maker publishes, plus what suppliers say about insurance.
Elvie vs Willow side by side
Each value links to the maker's page. Noise, suction and leak statements are the makers' claims.
| Model | Max suction | Weight | Power | Closed system | Coverage / where to buy |
|---|---|---|---|---|---|
| Elvie PumpWearable | Not published | About 8 oz hub | 5 to 6 sessions per charge | Yes | Upgrade, per AeroflowAmazonAffiliate link |
| Elvie StrideWearable | Up to 300 mmHg, single-cup setup | Under 5 oz per cup | Nearly 3 hours per charge | Yes | Often an upgrade fee, per ByramAmazonAffiliate link |
| Willow GoWearable | Up to 295 mmHg per side | Not published | Up to 8 sessions per charge | Yes | Upgrade fee, per AeroflowAmazonAffiliate link |
| Willow 360Wearable | Up to 245 mmHg | 0.8 lb, per Military Pumps | Up to 5 sessions per charge | Not stated | Upgrade, per AeroflowAmazonAffiliate link |
| Spec | Elvie Pump | Elvie Stride | Willow Go | Willow 360 |
|---|---|---|---|---|
| Design | In-bra, bottle and hub in one unit [1] | In-bra cups plus outside hub [2] | Fully in-bra, no cords or external motors [4] | Fully in-bra, no external motor or cords [5] |
| Maximum suction | Not published [1] | Up to 300 mmHg, single-cup setup [2] | Up to 295 mmHg per side [4] | Up to 245 mmHg [5] |
| Suction levels | Not stated here | 10 settings per mode [2] | 15 [4] | 7 [5] |
| Capacity | 5 oz bottle [1] | Cups under 5 oz in weight; capacity not stated [2] | Up to 5 oz each, 7 oz sold separately [4] | 4 oz bags; reusable containers also fit [5] |
| Battery | 5 to 6 sessions [1] | Nearly 3 hours [2] | Up to 8 sessions [4] | Up to 5 sessions [5] |
| Noise (maker's claim) | 32 dB [1] | "Ultra-quiet," no figure [2] | Not stated [4] | Not stated [5] |
| App | Yes [1] | Yes [2] | Yes, no Apple Watch [4] | Yes, plus Apple Watch [5] |
| Closed system | Yes [1] | Yes [2] | Yes | Not stated here |
| Included flanges | 24 and 28 mm [1] | Not stated here | 21 and 24 mm, plus inserts [4] | 24 mm, 21 mm inserts [5] |
In-bra or cup design: what changes
An all-in-one pump holds the motor and milk in a single unit in your bra. That's the Elvie Pump, Willow Go and Willow 360. The Elvie Pump hub is listed at 225 g and 128 by 110 by 68 mm [1]. Military Pumps lists the Willow 360 at 0.8 lb [12], and Willow doesn't publish a Go weight.
The Elvie Stride splits the parts: two soft cups, each under 5 ounces, connected by tubes to a hub that clips outside the bra [2]. The trade-off is a bulkier setup in exchange for a lighter cup, and Elvie lists the highest suction number of the four. Elvie also sells a newer Stride 2 with redesigned silicone cups and six sizing options in the box [3]. The Stride we link to is the original, so confirm which one you're ordering.
Spill-proof claims, in the makers' words
These are claims, not test results:
- Willow 360: "100% leak-proof," with a patented latch that Willow says works in any position when used with its self-sealing bags, and up to 180 degrees with reusable containers [5].
- Willow Go: Willow says it comes with SplashGuard containers [4]. It makes no 100% claim on the page we read.
- Elvie Pump: Elvie says it reduces leaks from heavy let-down and calls it a closed system [1].
- Elvie Stride: Elvie describes an easy-pour spout, not a leak guarantee [2].
A closed system, as makers use the term, means milk is kept out of the motor. It isn't the same as leak-proof.
Capacity, battery and app
Capacity per side is close: 5 ounces for the Elvie Pump bottle and the Go's standard containers [1][4]. Willow sells 7-ounce containers for the Go [4].
Battery splits more. Willow lists up to 8 sessions for the Go and up to 5 for the 360 [4][5], against 5 to 6 sessions for the Elvie Pump and nearly 3 hours for the Stride [1][2]. A session is the maker's unit, so compare with your own session length in mind.
Every pump here has an app. Willow's app includes volume tracking and in-app lactation support [4]. Elvie's app shows live milk volume and session tracking for the Pump [1]. Apple Watch control is on the Willow 360 but not the Go [4].
Does insurance cover Elvie or Willow pumps?
Mostly as upgrades:
- Willow Go: Aeroflow says it is an upgrade item with an out-of-pocket cost [6], and Byram lists it among its five most common upgrades [8].
- Willow 360: Aeroflow says Willow pumps are considered an upgrade and come with an out-of-pocket cost [6].
- Elvie Stride: Byram lists it among its most common upgrades [8], and Aeroflow says wearable pumps like Elvie are upgrade items [7].
- Elvie Pump: Aeroflow lists it as an upgrade [7].
Plans differ. UnitedHealthcare lists wearable pumps among the types typically covered, Cigna calls wireless pumps an upgrade, and Aetna's policy doesn't cover purchase of a wearable battery-operated pump [9][10][11]. Byram says upgrade fees aren't reimbursable by insurance but may be payable with HSA or FSA money [8]. See our guide to ordering a pump through insurance and the 12-model coverage comparison.
Recalls
We searched FDA's device recall database on October 16, 2026 and found no entries for Elvie or Willow pumps [13]. Recalls can be added at any time, so check each maker's site for your model.
Who each fits
| If you care about... | Look at | Why |
|---|---|---|
| A published quiet figure | Elvie Pump | The only 32 dB claim of the four [1] |
| Highest published suction | Elvie Stride | Up to 300 mmHg in a single-cup setup [2] |
| Longest battery | Willow Go | Up to 8 sessions [4] |
| A leak-proof latch and Apple Watch | Willow 360 | Willow's own claims [5] |
| Everything inside the bra | Elvie Pump, Willow Go or 360 | Stride has an outside hub [2] |
For six wearables compared by use, see our wearable pump guide, and for regular pumps, breast pumps compared. Wearables can need different flange sizes, so read our flange size guide before you order. A lactation consultant can check fit.
If you're paying out of pocket, here are the labeled Amazon links: Elvie Pump Affiliate link, Elvie Stride Affiliate link, Willow Go Affiliate link and Willow 360 Affiliate link. Check price on Amazon, and ask your supplier about an upgrade fee first.
Questions people ask
What is the difference between Elvie and Willow breast pumps?
Both make app-controlled wearable pumps. The Elvie Pump and Willow pumps sit fully in the bra. The Elvie Stride has cups plus an outside hub. Elvie claims 32 dB for the Pump, and Willow lists up to 8 sessions per charge for the Go and a leak-proof latch for the 360.
Are Elvie and Willow pumps spill-proof?
Both makers make claims, and we can't confirm them. Willow calls the 360 100% leak-proof with its milk bags and leak-proof up to 180 degrees with reusable containers. Elvie says the Pump reduces leaks from heavy let-down and has a closed system.
Which holds more milk, Elvie or Willow?
Elvie Pump bottles hold 5 oz. Willow Go containers hold up to 5 oz each (10 oz total), and Willow sells 7-ounce containers. Willow 360 uses 4-ounce bags or reusable containers. Elvie doesn't state a capacity for the Stride cups, only a weight under 5 oz each.
Does insurance cover Elvie or Willow pumps?
Usually as an upgrade. Byram lists the Elvie Stride and Willow Go among its most common upgrades, and Aeroflow says wearable pumps like Elvie are upgrade items and that Willow pumps carry an out-of-pocket cost. Some plans differ, such as UnitedHealthcare listing wearables among types typically covered.
Is the Willow 360 better than the Willow Go?
They trade features. On Willow's pages, the Go has higher suction (295 vs 245 mmHg), 15 levels and up to 8 sessions per charge, and the 360 has the leak-proof latch, milk bags and Apple Watch control. Which fits depends on what you value.
Do Elvie and Willow need a different flange size?
Possibly. Elvie ships 24 mm shields and sells sizes up to 28 mm with inserts, and Willow Go includes 21 and 24 mm flanges with free inserts. Measure with each maker's guide.
Sources
Numbers in brackets in the guide link to these sources.
- 1.Elvie Pump: Ultra-Quiet, Ultra-Discreet Wearable Breast PumpElvie, 2026
- 2.Elvie Stride: Hospital-Grade Electric Breast PumpElvie, 2026
- 3.Elvie Stride vs Elvie Stride 2: what's the difference?Elvie, 2026
- 4.Willow Go Wearable Breast PumpWillow, 2026
- 5.Willow 360: Hands-Free, Leak-Proof Wearable Breast PumpWillow, 2026
- 6.Willow Breast Pumps Through InsuranceAeroflow Breastpumps, 2026
- 7.Elvie Breast Pumps Through InsuranceAeroflow Breastpumps, 2026
- 8.Breast Pumps Through Insurance (FAQ)Byram Healthcare (Byram Baby), 2026
- 9.Breast pump coverageUnitedHealthcare, 2026
- 10.Preventive Care Services, Administrative Policy A004 (effective 10/1/2026)Cigna Healthcare, 2026
- 11.Breast Pumps, Clinical Policy Bulletin 0421Aetna, 2026
- 12.Willow 360 - TRICARE Covered Breast PumpsMilitary Pumps, 2026
- 13.Device Recalls (openFDA)U.S. Food and Drug Administration (FDA), 2026
