---
title: "Rs232 to Usb — $370K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/electronics/rs232-to-usb"
last_updated: "2026-08-11T20:10:45.242Z"
locale: en
meta:
description: "Niche score 41/100 · $370K/yr market · 265K searches/yr · $14.05 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 41/100 · $370K/yr market · 265K searches/yr · $14.05 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Rs232 to Usb — $370K/yr Amazon US Niche (2026) - Flapen"
---
# **rs232 to usb**
**Skip it**
A concentrated shelf (top 5 take 94% of clicks) — this niche doesn't clear our bar today.
Market size 54Growth 24Conversion 87Competition 5Returns 62Price range 51Avg price 67Brand share 8Review moat 44Quality gap 43
**Conversion**
**Great****9.9%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Good****$14.05**
avg listing price — sweet spot $15–$100
**Returns**
**Good****2.5%**
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**
**Okay****2,139.71**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-1.6%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****97%**
top-5 brand share — brand-locked demand
**Competition**
**Bad****94%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United States niche tracking, rs232 to usb 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 ~~](https://flapen.com/research/methodology)
## **rs232 to usb 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**
**47**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**94%**
Top 20: 100%
**Open market**
**0%**
- 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.
6K4KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.2×
[**Open Trend **](https://flapen.com/research/us/electronics/rs232-to-usb/trend)
## **Top rs232 to usb search terms**
- **rs232 to usb**44K/yr+6.1%7.3% conv. - **usb to serial adapter**43K/yr-9.0%9.2% conv. - **serial to usb adapter**36K/yr-10.3%7.2% conv. - **usb to rs232**20K/yr-2.0%9.3% conv. - **usb to serial**15K/yr+0.6%7.8% conv. - **usb serial adapter**14K/yr+9.1%4.7% conv. - **db9 to usb**14K/yr-5.1%7.0% conv. - **serial to usb**10K/yr-3.4%8.4% conv. - **usb to serial cable**7K/yr+16.1%8.3% conv. - **usb to serial rs-232 adapter**9K/yr+37.9%8.6% conv. [**All search terms **](https://flapen.com/research/us/electronics/rs232-to-usb/search-terms)
## **Top rs232 to usb 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.
0%15%$55K30%$111K45%$166K60%$222K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**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**$12.97**4.6★1,986 rev](https://www.amazon.com/dp/B0759HSLP1) [2**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**$9.45**4.4★7,688 rev](https://www.amazon.com/dp/B00IDSM6BW) [3**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**$23.47**4.6★1,450 rev](https://www.amazon.com/dp/B00AHYJWWG) [4**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**$11.67**4.5★2,339 rev](https://www.amazon.com/dp/B0769DVQM1) [5**StarTech 17in 1-Port USB to Serial Adapter Cable M/M 43cm (ICUSB232V2)**StarTech.com**$21.09**4.6★1,198 rev](https://www.amazon.com/dp/B00GRP8EZU)
**~~View all top sellers →~~**
### **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**$12.70**173 rev3y ago](https://www.amazon.com/dp/B0BKJKYCJK) [**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**$7.00**144 rev4y ago](https://www.amazon.com/dp/B0B3937767) [**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**$12.97**1,986 rev7y ago](https://www.amazon.com/dp/B0759HSLP1) [**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**$11.67**2,339 rev8y ago](https://www.amazon.com/dp/B0769DVQM1) [**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**$9.45**7,688 rev12y ago](https://www.amazon.com/dp/B00IDSM6BW)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**StarTech 17in 1-Port USB to Serial Adapter Cable M/M 43cm (ICUSB232V2)**StarTech.com**$21.09**4.6★**▲ 33%**](https://www.amazon.com/dp/B00GRP8EZU) [**OIKWAN USB to RS232 Serial Adapter with FTDI Chipset - USB 2.0 to Female DB9 Serial Cable for Windows and Mac (6ft)**OIKWAN**$12.70**4.4★**▲ 30%**](https://www.amazon.com/dp/B0BKJKYCJK) [**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**$12.97**4.6★**— 9%**](https://www.amazon.com/dp/B0759HSLP1) [**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**$11.67**4.5★**— 9%**](https://www.amazon.com/dp/B0769DVQM1) [**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**$23.47**4.6★**▼ 13%**](https://www.amazon.com/dp/B00AHYJWWG)
**~~View all trending →~~**
## **What buyers say about rs232 to usb**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Advertised Vs Actual Product**28%
*“Serves it's purpose”*
**Quality-Overall**13%
*“Very pleased high quality cable”*
**Size-Overall**13%
*“Completes the fit out”*
**Connectivity-Overall**10%
*“Affordable serial connectivity that works”*
**Socket/Port/Plug**8%
*“Serial to USB and back”*
**Value For Money**4%
*“Good for the value”*
**Ease Of Use**4%
*“Easy to use”*
**Compatibility-Overall**3%
*“Worked perfect with my Windows 11 laptop”*
**Strength**2%
*“Sturdy cable”*
**Efficiency**2%
*“Works fine”*
### **What buyers complain about **
**Functionality-Overall**26%
*“Cable does not work”*
**Software/Application**16%
*“won't download software driver”*
**Compatibility-Overall**11%
*“Couldnt get it to work on any of my computers”*
**Instructions/User Manual/Troubleshooting**8%
*“Does not come with any instructions”*
**Quality-Overall**8%
*“Junk”*
**Connectivity-Overall**8%
*“Cable does not work to communicate with my laser”*
**Durability**5%
*“durability seems questionable”*
**Socket/Port/Plug**4%
*“it will NOT communicate with the serial port”*
**Value For Money**3%
*“can't really afford these kinds of delays over a few bucks”*
**Heating**2%
*“After that it got uncomfortably hot to the touch”*
### **Top return reasons **
**Compatibility-Overall**45%
**Connectivity-Overall**15%
**Functionality-Overall**12%
**Size-Overall**10%
**Socket/Port/Plug**5%
**Defective Material/Parts**3%
**Value For Money**2%
**Length**2%
**Advertised Vs Actual Product**2%
**Software/Application**1%
## **Common questions**
- **Is rs232 to usb 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 rs232 to usb 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 rs232 to usb?**
- Top complaints mined from reviews: Functionality-Overall, Software/Application, Compatibility-Overall. The return rate is 2.5%.
- **When does demand for rs232 to usb peak?**
- Demand is steady year-round — the busiest month runs 1.2× the quietest.
- **What does it cost to enter the rs232 to usb 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.
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