db9 female to female
Skip itBrand-locked demand (top 5 brands take 94% of clicks) — this niche doesn't clear our bar today.
Returns
Great1.4%return rate — above 5% kills the launch gate
Review moat
Great369.78avg 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–$31.82cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Good4.5%search→purchase rate — share of searches ending in a sale
Avg price
Okay$10.67avg listing price — sweet spot $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Competition
Okay68%top-5 click share — leaders hold, buyers still browse
Market size
Bad$74K$74K/yr · 153K searches
Brand share
Bad94%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
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 adapter40K/yr
- null modem34K/yr
- db9 null modem adapter32K/yr
- db9 null modem31K/yr
- rs232 null modem adapter8K/yr
- db9 female to female6K/yr
- rs232 female to female2K/yr
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.
All 18 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
DB9 null modem male to female slimline data transfer serial port adapter 2 Pack
Arnorin$7.754.7★1,019 rev
Arnorin DB9 Null Modem Female to Female Slimline Data Transfer Serial Port Adapter 2 Pack
Arnorin$7.784.7★800 rev
Arnorin DB9 Null Modem Adapter Male to Male Slimline Data Transfer Serial Port Adapter 2 Pack
Arnorin$7.954.7★299 rev
Arnorin DB9 Null Modem Adapter Male to Female Slimline Data Transfer Serial Port Adapter 10 Pack
Arnorin$27.534.8★62 rev
StarTech DB9 RS232 Serial Null Modem Adapter Female to Female (NM9FF)
StarTech.com$5.574.5★328 rev
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!$11.0624 rev
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$6.106 rev
LuoQiuFa 2 Pack Rs232 Serial Cable 9 Pin DB9 Female to FemaleGender Changer Coupler Adapter Connector
LuoQiuFa$7.1244 rev
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$7.90378 rev
DTECH DB9 RS232 Serial Cable Female to Female Null Modem Cord Full Handshaking 7 Wire Crossover for Data Communication (1.5 Feet Black)
DTECH$7.99112 rev
Trending
90-day click momentumCyberguys! 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!$11.064.2★
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$6.104.0★
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$7.904.6★
StarTech 6ft USB to Serial RS232 Adapter Null Modem TAA (ICUSB232FTN)
StarTech.com$31.824.6★
Arnorin DB9 Null Modem Adapter Male to Female Slimline Data Transfer Serial Port Adapter 5 Pack
Arnorin$17.884.6★
What buyers say about db9 female to female
What buyers praise and complain about, mined from review topics.What buyers love
“a fine cable”
“they worked exactly as expected”
“Compatible with Windows 11”
“easy compact solution”
“Good pinout for data transfers”
“Easy to install”
“This cable worked awesome to connect Digi SP One from car wash Server to a remote Digi for communication”
“Better than the magnetic closet catches we purchased on Amazon”
“It's a very simple plug-and-play solution that just does the job perfectly”
“simple and easy to use cable”
What buyers complain about
“did not work”
“These db9 gender changers are absolute garbage”
“when you do they just fall apart”
“I wasn't getting any signal at all with my setup”
“it makes them unusable”
“None of the devices I use are compatible with any of the three changers”
Top return reasons
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.