---
title: "Db9 Female to Female — $74K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/electronics/db9-female-to-female"
last_updated: "2026-08-06T07:29:33.946Z"
locale: en
meta:
description: "Niche score 45/100 · $74K/yr market · 153K searches/yr · $10.67 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 45/100 · $74K/yr market · 153K searches/yr · $10.67 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Db9 Female to Female — $74K/yr Amazon US Niche (2026) - Flapen"
---
# **db9 female to female**
**Skip it**
Brand-locked demand (top 5 brands take 94% of clicks) — this niche doesn't clear our bar today.
Market size 18Growth 63Conversion 54Competition 28Returns 87Price range 63Avg price 39Brand share 16Review moat 82Quality gap 35
**Returns**
**Great****1.4%**
return rate — above 5% kills the launch gate
**Review moat**
**Great****369.78**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Good****+40.7%**
90-day search growth — must beat 0% to launch
**Price range**
**Good****$5.33–$31.82**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Good****4.5%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Okay****$10.67**
avg listing price — sweet spot $15–$100
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Competition**
**Okay****68%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Bad****$74K**
$74K/yr · 153K searches
**Brand share**
**Bad****94%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, db9 female to female is a $74K/yr Amazon United States market (153K searches/yr). The top 5 brands hold 94% of demand. Verdict: Skip it — 45/100.
Data updated Jul 21, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **db9 female to female market data**
- **Units sold / yr**
- **5K–6K**
- avg 250–500/product
- **Revenue / yr**
- **$53K–$64K**
- units × avg price
- **Conversion rate**
- **4.5%**
- **Avg BSR**
- **#569**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **89%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **93 months**
- **Avg seller age**
- **215 days**
## **Competition & brand share**
The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**8 **▲rising
**Sellers**
**59**
**Top-5 brand share**
**94%**
Top 20: 100%
**Top-5 click share**
**68%**
Top 20: 100%
**Open market**
**4%**
- Arnorin66% - StarTech.com12% - DTECH9% - C2G4% - Lamroyce3% - Cyberguys!3% - Open — no brand owns it (2 brands, 4%)
## **Top db9 female to female search terms**
- **null modem adapter**40K/yr+15.8%4.0% conv. - **null modem**34K/yr+27.0%1.3% conv. - **db9 null modem adapter**32K/yr+23.1%2.0% conv. - **db9 null modem**31K/yr+18.3%1.4% conv. - **rs232 null modem adapter**8K/yr>1,000%0.8% conv. - **db9 female to female**6K/yr+6.0%11.5% conv. - **rs232 female to female**2K/yr+6.3%14.2% conv. [**All search terms **](https://flapen.com/research/us/electronics/db9-female-to-female/search-terms)
## **Top db9 female to female 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%10%$7K20%$15K30%$22K40%$29K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 18 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**DB9 null modem male to female slimline data transfer serial port adapter 2 Pack**Arnorin**$7.75**4.7★1,019 rev](https://www.amazon.com/dp/B075XHWVSJ) [2**Arnorin DB9 Null Modem Female to Female Slimline Data Transfer Serial Port Adapter 2 Pack**Arnorin**$7.78**4.7★800 rev](https://www.amazon.com/dp/B075XGRLXW) [3**Arnorin DB9 Null Modem Adapter Male to Male Slimline Data Transfer Serial Port Adapter 2 Pack**Arnorin**$7.95**4.7★299 rev](https://www.amazon.com/dp/B07GV5PGJ5) [4**Arnorin DB9 Null Modem Adapter Male to Female Slimline Data Transfer Serial Port Adapter 10 Pack**Arnorin**$27.53**4.8★62 rev](https://www.amazon.com/dp/B078C7DY5C) [5**StarTech DB9 RS232 Serial Null Modem Adapter Female to Female (NM9FF)**StarTech.com**$5.57**4.5★328 rev](https://www.amazon.com/dp/B000DZH4V0)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Cyberguys! DB9 Adapter 3-Pack RS232 Serial Gender Changer Set Female to Female Male to Male Male to Female DB9 Serial Port Connector Adapters for PC Modem POS Router Printer Switch**Cyberguys!**$11.06**24 rev10mo ago](https://www.amazon.com/dp/B0FH4WHNT9) [**Lamroyce 9-Pin DB9 Coupler 2 Pack 9-Pin DB9 Female to Female Adapter Connector Mini Gender Changer Extender Support 1080P Full HD-RS232 Serial Cable Coupler for Data Transfer**Lamroyce**$6.10**6 rev1y ago](https://www.amazon.com/dp/B0FDFXM23S) [**LuoQiuFa 2 Pack Rs232 Serial Cable 9 Pin DB9 Female to FemaleGender Changer Coupler Adapter Connector**LuoQiuFa**$7.12**44 rev5y ago](https://www.amazon.com/dp/B099RFQH3Z) [**DTECH 1.5 ft Straight Through Serial DB9 Cable Female to Female 9 Pin COM Port Cord for Data Communication (0.5 Meter Black)**DTECH**$7.90**378 rev5y ago](https://www.amazon.com/dp/B08SMD12M8) [**DTECH DB9 RS232 Serial Cable Female to Female Null Modem Cord Full Handshaking 7 Wire Crossover for Data Communication (1.5 Feet Black)**DTECH**$7.99**112 rev5y ago](https://www.amazon.com/dp/B08T996RBF)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Cyberguys! DB9 Adapter 3-Pack RS232 Serial Gender Changer Set Female to Female Male to Male Male to Female DB9 Serial Port Connector Adapters for PC Modem POS Router Printer Switch**Cyberguys!**$11.06**4.2★**▲ 107%**](https://www.amazon.com/dp/B0FH4WHNT9) [**Lamroyce 9-Pin DB9 Coupler 2 Pack 9-Pin DB9 Female to Female Adapter Connector Mini Gender Changer Extender Support 1080P Full HD-RS232 Serial Cable Coupler for Data Transfer**Lamroyce**$6.10**4.0★**▲ 100%**](https://www.amazon.com/dp/B0FDFXM23S) [**DTECH 1.5 ft Straight Through Serial DB9 Cable Female to Female 9 Pin COM Port Cord for Data Communication (0.5 Meter Black)**DTECH**$7.90**4.6★**▲ 15%**](https://www.amazon.com/dp/B08SMD12M8) [**StarTech 6ft USB to Serial RS232 Adapter Null Modem TAA (ICUSB232FTN)**StarTech.com**$31.82**4.6★**▲ 13%**](https://www.amazon.com/dp/B008634VJY) [**Arnorin DB9 Null Modem Adapter Male to Female Slimline Data Transfer Serial Port Adapter 5 Pack**Arnorin**$17.88**4.6★**▲ 11%**](https://www.amazon.com/dp/B077SX5ZPH)
**~~View all trending →~~**
## **What buyers say about db9 female to female**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**29%
*“a fine cable”*
**Advertised Vs Actual Product**11%
*“they worked exactly as expected”*
**Compatibility-Overall**11%
*“Compatible with Windows 11”*
**Compactness**10%
*“easy compact solution”*
**Data Transfer Speed**7%
*“Good pinout for data transfers”*
**Assembly/Installation**6%
*“Easy to install”*
**Connectivity-Overall**5%
*“This cable worked awesome to connect Digi SP One from car wash Server to a remote Digi for communication”*
**Magnetic Strength/Adsorption**3%
*“Better than the magnetic closet catches we purchased on Amazon”*
**Socket/Port/Plug**3%
*“It's a very simple plug-and-play solution that just does the job perfectly”*
**Ease Of Use**2%
*“simple and easy to use cable”*
### **What buyers complain about **
**Functionality-Overall**30%
*“did not work”*
**Quality-Overall**17%
*“These db9 gender changers are absolute garbage”*
**Durability**10%
*“when you do they just fall apart”*
**Signal Strength**10%
*“I wasn't getting any signal at all with my setup”*
**Ease Of Use**7%
*“it makes them unusable”*
**Compatibility-Overall**7%
*“None of the devices I use are compatible with any of the three changers”*
### **Top return reasons **
**Compatibility-Overall**27%
**Functionality-Overall**19%
**Connectivity-Overall**12%
**Size-Overall**11%
**Length**6%
**Defective Material/Parts**6%
**Advertised Vs Actual Product**4%
**Socket/Port/Plug**3%
**Quality-Overall**3%
**Assembly/Installation**2%
## **Common questions**
- **Is db9 female to female profitable to sell on Amazon United States?**
- The niche generates $74K/yr across 18 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +40.7%. Flapen's verdict: Skip it (45/100).
- **How competitive is the db9 female to female niche?**
- 8 brands and 59 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 94% of demand.
- **What do buyers complain about in db9 female to female?**
- Top complaints mined from reviews: Functionality-Overall, Quality-Overall, Durability. The return rate is 1.4%.
- **What does it cost to enter the db9 female to female niche?**
- Listings span $5.33–$31.82; the average listing price is $10.67 (sweet spot $15–$100). The average incumbent carries 370 reviews — the moat a new listing must climb.
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