These are not really the same size class, and that is the honest framing here. The Soundcore Boom Go 3i ranks #2 of 62 small speakers by sound quality at $59.98; the Ultimate Ears Boom 4 ranks #113 of 179 medium speakers by sound quality at $114.99.
The Soundcore Boom Go 3i is the longer-running, lighter choice. A tough, floating mini speaker with full waterproofing, a long battery and a detachable strap, built for travel and the outdoors. It is rated for 24 hours of battery against 15 for the Ultimate Ears Boom 4. At 0.8 lbs (380 g) it weighs much less than the Ultimate Ears Boom 4 at 1.4 lbs (620 g). The catch: This is still a 15W mono speaker: bass impact and stereo width are limited, and critical listeners may find the upper treble piercing or metallic.
What the Ultimate Ears Boom 4 does well: A tough waterproof speaker that floats, with USB-C charging, app EQ and pairing with other UE speakers. It plays in stereo from a single unit, unlike the Soundcore Boom Go 3i. The catch: Not much improvement over the old ones.
Buy the Soundcore Boom Go 3i at $59.98 if you want a small speaker. Buy the Ultimate Ears Boom 4 at $114.99 if you want a medium speaker instead.
Want more options? Browse the full Portable Bluetooth rankings.
Prices on this page were last checked November 7, 2026 at 7:34 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| Soundcore Boom Go 3i | Ultimate Ears Boom 4 | |
|---|---|---|
| Price | $59.98 | $114.99 |
| Ranked | #2 of 62 in Small Size Portable Bluetooth Speakers | #113 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Aux Input | No | No |
| Battery Life | 24 hours (Manufacturer specified) | 15 hours (Manufacturer specified) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | SBC |
| Built-in Microphone | Yes | No |
| EQ | Yes | Yes (via app) |
| IP Rating | IP68 | IP67 |
| Party Mode | Yes (Auracast) | - |
| Power Bank | Yes (USB-C) | No |
| Power Input | USB-C | USB-C |
| Stereo | No | Yes |
| Omnidirectional | Pointing up | No |
| TWS | Yes | Yes |
| Weight | 0.8 lbs (380 g) | 1.4 lbs (620 g) |
| Bluetooth Version | 6.0 | 5.1 |
| Amplifier Power | 15W | - |
| Dimensions | 4” x 4.2” x 1.8” (102.1 x 105.9 x 45.5 mm) | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) |
| Drivers | 25mm tweeter + 42mm woofer + passive radiators | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators |
| Maximum SPL | 92dB (Manufacturer specified) | 85dBC (Manufacturer specified) |
| Digital Aux Input | No | No |
| Lights | Yes | - |
| Strap | Yes (detachable strap) | Yes (built-in loop) |
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