Is usb to serial adapter profitable to sell on Amazon United States?

The niche generates $370K/yr across 7 tracked products. 90-day search growth is -1.6%. Flapen's verdict: Skip it (41/100).

How competitive is the usb to serial adapter niche?

6 brands and 47 sellers compete. The top 5 products take 94% of clicks and top 5 brands hold 97% of demand.

What do buyers complain about in usb to serial adapter?

Top complaints mined from reviews: Functionality-Overall, Software/Application, Compatibility-Overall. The return rate is 2.5%.

When does demand for usb to serial adapter peak?

Demand is steady year-round — the busiest month runs 1.2× the quietest.

What does it cost to enter the usb to serial adapter niche?

Listings span $7.00–$23.47; the average listing price is $14.05 (sweet spot $15–$100). The average incumbent carries 2,140 reviews — the moat a new listing must climb.

usb to serial adapter

Skip it

A concentrated shelf (top 5 take 94% of clicks) — this niche doesn't clear our bar today.

Conversion

Great9.9%

search→purchase rate — share of searches ending in a sale

Avg price

Good$14.05

avg listing price — sweet spot $15–$100

Returns

Good2.5%

return rate — above 5% kills the launch gate

Market size

Good$370K

$370K/yr · 265K searches

Price range

Good$7.00–$23.47

cheapest to priciest tracked listing — scored on the share inside $15–$100

Review moat

Okay2,139.71

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Growth

Bad-1.6%

90-day search growth — must beat 0% to launch

Brand share

Bad97%

top-5 brand share — brand-locked demand

Competition

Bad94%

top-5 click share — a locked-up shelf

According to Flapen's Amazon United States niche tracking, usb to serial adapter is a $370K/yr Amazon United States market (265K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 41/100.

Data updated Jul 21, 2026 · scored weekly · How we score niches

usb to serial adapter market data

Units sold / yr: 30K–40K; avg 4,000–5,000/product
Revenue / yr: $422K–$562K; units × avg price
Conversion rate: 9.9%
Avg BSR: #11
Page quality: 0%
Prime: 100%
Sponsored: 100%
Out of stock: 0.0%
Avg brand age: 71 months
Avg seller age: 187 days

Competition & brand share

The top 5 products capture 94% of clicks — a locked-up shelf that new listings rarely crack.

Brands

6 flat

Sellers

Top-5 brand share

97%

Top 20: 100%

Top-5 click share

94%

Top 20: 100%

Open market

OIKWAN56%
SABRENT21%
Gearmo10%
CableCreation6%
StarTech.com4%
EC Buying3%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -1.6% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.2×

Open Trend

Top usb to serial adapter search terms

rs232 to usb44K/yr +6.1%7.3% conv.
usb to serial adapter43K/yr -9.0%9.2% conv.
serial to usb adapter36K/yr -10.3%7.2% conv.
usb to rs23220K/yr -2.0%9.3% conv.
usb to serial15K/yr +0.6%7.8% conv.
usb serial adapter14K/yr +9.1%4.7% conv.
db9 to usb14K/yr -5.1%7.0% conv.
serial to usb10K/yr -3.4%8.4% conv.
usb to serial cable7K/yr +16.1%8.3% conv.
usb to serial rs-232 adapter9K/yr +37.9%8.6% conv.

All search terms

Top usb to serial adapter products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 7 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

OIKWAN USB to RS232 USB Serial Adapter with FTDI Chipset USB 2.0 to Male DB9 Serial Cable for Windows 11 10 8 7 Vista XP 2000 Linux and Mac OS(6ft)

OIKWAN$12.974.6★1,986 rev

SABRENT USB 2.0 to Serial (DB9 RS232) Adapter Cable Prolific Chipset Driver Support Required for Some Systems Windows 11/10/8/7 macOS Linux (CB-DB9P)

SABRENT$9.454.4★7,688 rev

Gearmo USB to Serial RS-232 Adapter with LED Indicators FTDI Chipset Supports Windows 11/10/8.1/8/7 Mac OS X 10.6 and Above

Gearmo$23.474.6★1,450 rev

CableCreation USB to RS232 Serial Adapter with PL2303 Chipset 6.6 FT USB 2.0 to DB9 Female Converter Cable for Cashier Register Modem Scanner Digital Cameras CNC etc Black

CableCreation$11.674.5★2,339 rev

StarTech 17in 1-Port USB to Serial Adapter Cable M/M 43cm (ICUSB232V2)

StarTech.com$21.094.6★1,198 rev

Newest

by launch date

OIKWAN USB to RS232 Serial Adapter with FTDI Chipset - USB 2.0 to Female DB9 Serial Cable for Windows and Mac (6ft)

OIKWAN$12.70173 rev

3y ago

EC Buying USB 2.0 to Serial DB-9 RS232 Adapter Windows 7/8/10/11/32/64/XP/RS232 to USB Converter

EC Buying$7.00144 rev

4y ago

OIKWAN USB to RS232 USB Serial Adapter with FTDI Chipset USB 2.0 to Male DB9 Serial Cable for Windows 11 10 8 7 Vista XP 2000 Linux and Mac OS(6ft)

OIKWAN$12.971,986 rev

7y ago

CableCreation USB to RS232 Serial Adapter with PL2303 Chipset 6.6 FT USB 2.0 to DB9 Female Converter Cable for Cashier Register Modem Scanner Digital Cameras CNC etc Black

CableCreation$11.672,339 rev

8y ago

SABRENT USB 2.0 to Serial (DB9 RS232) Adapter Cable Prolific Chipset Driver Support Required for Some Systems Windows 11/10/8/7 macOS Linux (CB-DB9P)

SABRENT$9.457,688 rev

12y ago

What buyers say about usb to serial adapter

What buyers praise and complain about, mined from review topics.

What buyers love

Advertised Vs Actual Product28%

“Serves it's purpose”

Quality-Overall13%

“Very pleased high quality cable”

Size-Overall13%

“Completes the fit out”

Connectivity-Overall10%

“Affordable serial connectivity that works”

Socket/Port/Plug8%

“Serial to USB and back”

Value For Money4%

“Good for the value”

Ease Of Use4%

“Easy to use”

Compatibility-Overall3%

“Worked perfect with my Windows 11 laptop”

Strength2%

“Sturdy cable”

Efficiency2%

“Works fine”

What buyers complain about

Functionality-Overall26%

“Cable does not work”

Software/Application16%

“won't download software driver”

Compatibility-Overall11%

“Couldnt get it to work on any of my computers”

Instructions/User Manual/Troubleshooting8%

“Does not come with any instructions”

Quality-Overall8%

“Junk”

Connectivity-Overall8%

“Cable does not work to communicate with my laser”

Durability5%

“durability seems questionable”

Socket/Port/Plug4%

“it will NOT communicate with the serial port”

Value For Money3%

“can't really afford these kinds of delays over a few bucks”

Heating2%

“After that it got uncomfortably hot to the touch”

Top return reasons

Compatibility-Overall45%

Connectivity-Overall15%

Functionality-Overall12%

Size-Overall10%

Socket/Port/Plug5%

Defective Material/Parts3%

Value For Money2%

Length2%

Advertised Vs Actual Product2%

Software/Application1%

Common questions

Is usb to serial adapter profitable to sell on Amazon United States?: The niche generates $370K/yr across 7 tracked products. 90-day search growth is -1.6%. Flapen's verdict: Skip it (41/100).
How competitive is the usb to serial adapter niche?: 6 brands and 47 sellers compete. The top 5 products take 94% of clicks and top 5 brands hold 97% of demand.
What do buyers complain about in usb to serial adapter?: Top complaints mined from reviews: Functionality-Overall, Software/Application, Compatibility-Overall. The return rate is 2.5%.
When does demand for usb to serial adapter peak?: Demand is steady year-round — the busiest month runs 1.2× the quietest.
What does it cost to enter the usb to serial adapter niche?: Listings span $7.00–$23.47; the average listing price is $14.05 (sweet spot $15–$100). The average incumbent carries 2,140 reviews — the moat a new listing must climb.