We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-17 · 7 min read · Independent comparison
If you want to plug USB-C headphones into a phone with no headphone jack while still fast-charging at up to 60W, choose Marsno USB C Splitter; if you need to keep using your old 3.5mm wired headphones (or a car aux cable) and charge at the same time, choose Mxcudu USB C.
• Marsno USB C Splitter – biggest strength: It splits one USB-C port into a USB-C audio port plus a USB-C charging port, so you keep an all-digital USB-C headphone setup and still charge at up to 60W PD.
• Marsno USB C Splitter – biggest trade-off: The audio port only works with USB-C headphones, and it is explicitly not for two headphones and not for video passthrough.
• Mxcudu USB C – biggest strength: It gives you a 3.5mm aux jack plus a USB-C charging port, so your existing wired earbuds and car aux cables still work while the phone charges at up to 60W PD.
• Mxcudu USB C – biggest trade-off: It is not compatible with Moto or OnePlus phones, and in-line control on Apple headphones may not work.
• Who each pick is for: Marsno for USB-C headphone owners who want a single compact adapter with a metal finish; Mxcudu for anyone with 3.5mm headphones who wants a lightweight white dongle with a braided cable.
The Marsno is a 2-in-1 adapter with a 1-in-2-out layout: your device's USB-C port becomes one USB-C audio port and one USB-C charging port. That's the whole pitch, and it's a specific one. The audio side runs through a built-in Realtek high-resolution DAC, and Marsno describes the sound as clear and lossless with plug-and-play operation and no current noise. The charging side supports Power Delivery up to 60W (20V/3A) with an EJ899M chip handling voltage stability. There's a caveat worth repeating: quick charging standards like QC may not be supported on some newer phones, so a PD wall charger is the recommended pairing.
Who should buy it? You. Well, you specifically if you already own USB-C headphones. This adapter is aimed at devices that dropped the 3.5mm jack — the compatibility list runs across iPhone 17/16/15 series, Samsung Galaxy S25 down through S21 and Note 20, Google Pixel 7/6/5/4, iPad Pro, Huawei, Sony Xperia, and MacBook. If your headphones end in a USB-C plug, this is the cleanest way to charge and listen at once without juggling two ports. The nylon-braided cable and metallic grey finish suggest it's built to survive a bag, and the 18-month warranty plus 24/7 support are the kind of backup you want on a small accessory that lives in a pocket.
Mxcudu USB C: Who It's For
The Mxcudu takes the opposite approach to the same problem. Instead of splitting into two USB-C ports, it splits your USB-C port into a 3.5mm audio jack and a USB-C PD charging port. That 3.5mm jack is the entire reason to pick this one: every pair of wired earbuds, over-ear headphones and aux cables you already own keeps working. It supports calling and in-line control — play, pause, skip, answer and hang up — and Mxcudu notes that in-line control may not work with Apple headphones. The adapter auto-identifies CTIA and OMTP wiring, so mic and audio both work at once.
The audio chip is a Realtek DAC rated up to 32Bit/384KHz, with noise reduction and what Mxcudu calls loss-free, distortion-free output. Charging is 60W PD, and the charging chip covers PD, QC, AFC and PPS standards, adjusting voltage and current to match whatever device is plugged in. That's broader fast-charge protocol coverage than the Marsno advertises. Compatibility spans iPhone 16/16 Pro/16 Plus/16 Pro Max and 15 series, Samsung Galaxy S24 through S20 plus the Z Flip 5 and Z Fold 5, Google Pixel 8/7/6/5, iPad Pro, iPad Air 6/5/4 and MacBook Air/Pro.
Who should buy it? You, if your headphones are 3.5mm and you refuse to replace them. It's also the better fit for in-car use where you're plugging into an aux input — though note Mxcudu says phone calling in the car isn't supported, and square card readers won't work either. At roughly 11g with a white integrated design and nylon-braided cable, it's the lighter, more pocketable of the two.
Who should skip it? Moto and OnePlus owners, full stop — Mxcudu lists both as incompatible. Skip it too if you need data transfer, because this adapter is audio and charging only. And if your headphones are USB-C rather than 3.5mm, this adapter has nothing to offer you.
Side-by-Side: Which Should You Choose?
• Best for USB-C headphones → Marsno USB C Splitter. Its audio port is USB-C only, so it matches your existing digital headphones.
• Best for 3.5mm headphones and aux cables → Mxcudu USB C. The 3.5mm jack is the deciding feature if you're keeping your old wired gear.
• Best build and finish → Marsno USB C Splitter. Metallic grey finish, nylon-braided cable and an 18-month warranty with 24/7 support.
• Best for travel weight → Mxcudu USB C. Around 11g in a compact white body — easy to leave in a bag and forget about.
• Best for iPhone 15/16/17 owners → either, with a catch. Both list those phones, but only Mxcudu gives you a 3.5mm jack, and only Marsno gives you a USB-C audio port.
• Best for Moto or OnePlus owners → Marsno USB C Splitter. Mxcudu states outright that it doesn't work with those brands.
• Best for two people sharing audio → neither. Marsno is not for two headphones, and Mxcudu doesn't split audio either.
In my opinion, the right pick comes down to one question: what plug is on the end of your headphones? If they're USB-C, I'd buy the Marsno USB C Splitter — it keeps the signal digital end to end, handles 60W PD, and comes with a metal finish and an 18-month warranty that suit something you'll carry daily. If they're 3.5mm, I'd buy the Mxcudu USB C without hesitating, because no amount of nice finishing beats a jack that actually fits your headphones. For most people still holding onto wired earbuds, that makes the Mxcudu the more practical buy. If you're unsure which camp you're in, check your headphone plug first — that single detail decides it.
Both support up to 60W Power Delivery, so charging speed is a wash on paper. The difference is protocol breadth: Mxcudu covers PD, QC, AFC and PPS, while Marsno warns that QC may not be supported on some newer phones. For charging alone, Mxcudu is the safer bet.
Can I use my old 3.5mm headphones with the Marsno USB C Splitter?
Mxcudu states it is not compatible with Moto or OnePlus phones. Marsno's compatibility list names iPhone, Samsung Galaxy, Pixel, iPad Pro, Huawei, Sony Xperia and MacBook, and doesn't flag those two brands as excluded.
I don't quote prices here because they move around. Both are small accessories in the same category, so check the current price on Amazon using the button on this page before deciding — and weigh that against whether you need a USB-C audio port or a 3.5mm jack.
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