Willow
Willow Go
$239.99
Released 2022
Best Breast Pumps · head-to-head
Willow Go vs Spectra S1 Plus
A sourced, side-by-side comparison. Spectra S1 Plus is cheaper at $225.99. Every spec and price links to its source.
Spectra Baby USA
Spectra S1 Plus
$225.99Cheaper
Which is better: the Willow Go or Spectra S1 Plus?
The Willow Go wins 1 of the 1 specs we compare head to head; the other wins 0. The Spectra S1 Plus is the cheaper at $225.99. Get the Willow Go for the stronger spec sheet, the Spectra S1 Plus to spend less.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Willow Go | Spectra S1 Plus |
|---|---|---|
| US price | $239.99 | $225.99 |
| Brand | Willow | Spectra Baby USA |
| Released | 2022 | — |
| Type | wearable | electric_double |
| Suction levels | 15 | 12 |
| Max suction mmhg | 295 | 270 |
| Rechargeable battery | Yes | Yes |
| Hospital grade | Yes | Yes |
| Closed system | Yes | Yes |
| Weight (oz) | 13.6 | 48 |
| Release | 2022 | — |
Sources — Willow Go: onewillow.com (verified 2026-06-19). Spectra S1 Plus: spectrababyusa.com (verified 2026-06-19).
What's the difference between the Willow Go and Spectra S1 Plus?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Type: Willow Go wearable vs Spectra S1 Plus electric_double
- Suction levels: Willow Go 15 vs Spectra S1 Plus 12
- Max suction mmhg: Willow Go 295 vs Spectra S1 Plus 270
- Weight (oz): Willow Go 13.6 vs Spectra S1 Plus 48
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Willow Go
Only one whitelisted tester, Reviewed (USA Today), published a hands-on Willow Go review (written and tested by Alexandra Frost); no Wirecutter, Good Housekeeping, or Wired lab test was fetchable. Reviewed calls it a comfortable, easy-to-set-up and easy-to-clean budget wearable, but flags limited mobility, a motor that feels weaker than hospital-grade pumps, and no milk-bag support. No measured benchmarks were reported. (1 sourced review, 1 lab-tested.)
Praised: Easy setup via clear directions and companion app; Comfortable against skin, doesn't feel plasticky; Simple to clean — only five dishwasher-safe parts.
Flagged: Limited mobility despite being marketed as hands-free; No milk-bag compatibility; must pour from reusable containers; Motor feels weaker than hospital-grade pumps.
Spectra S1 Plus
Two whitelisted, hands-on testers reviewed the Spectra S1 Plus: Reviewed (USA Today) lists it among the pumps its editor personally used, and Good Housekeeping names it Best Overall after Lab and consumer testing. Both reviews are qualitative, so neither published lab-measured suction or output numbers. Both praise its quiet, efficient operation and the built-in rechargeable battery that allows cordless pumping; they split on the roughly 3-pound weight. Non-whitelisted sources (BabyGearLab, Consumer Reports, forums) were not used. (2 sourced reviews, 2 lab-tested.)
Praised: Quiet operation; Efficient, powerful suction; Built-in rechargeable battery enables cordless pumping without an outlet.
Flagged: Bulky, odd shape that is hard to store with no carrying case included; On the heavier side for portability at a little over 3 lbs.