ninja knock box
Skip itSoft demand (-33.5% this quarter) — this niche doesn't clear our bar today.
Returns
Incredible0.9%return rate — above 5% kills the launch gate
Avg price
Great£15.53avg listing price — sweet spot $15–$100
Conversion
Good6.6%search→purchase rate — share of searches ending in a sale
Review moat
Good754.13avg incumbent reviews — the moat a new listing must climb
Price range
Good£9.46–£26.14cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Brand share
Bad94%top-5 brand share — brand-locked demand
Market size
Bad£55K£55K/yr · 54K searches
Growth
Bad-33.5%90-day search growth — must beat 0% to launch
Competition
Bad91%top-5 click share — a locked-up shelf
According to Flapen's Amazon United Kingdom niche tracking, ninja knock box is a £55K/yr Amazon United Kingdom market (54K searches/yr). The top 5 brands hold 94% of demand. Verdict: Skip it — 37/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
ninja knock box market data
- Units sold / yr
- 3K–3K
- avg 500–750/product
- Revenue / yr
- £39K–£47K
- units × avg price
- Conversion rate
- 6.6%
- Avg BSR
- #154
- Page quality
- 0%
- Prime
- 88%
- Sponsored
- 75%
- Out of stock
- 0.0%
- Avg brand age
- 20 months
- Avg seller age
- 209 days
Competition & brand share
The top 5 products capture 91% of clicks — a locked-up shelf that new listings rarely crack.Brands
7 falling
Sellers
19
Top-5 brand share
94%
Top 20: 100%
Top-5 click share
91%
Top 20: 100%
Open market
3%
- Ninja76%
- smallwell6%
- Ailelan5%
- Ideal Swan3%
- NOTSEK3%
- brikinte3%
- Open — no brand owns it (1 brand, 3%)
Demand
Weekly Amazon search volume, last 35 weeks — -33.5% search growth over the last 90 days.Top ninja knock box search terms
- ninja knock box32K/yr
- coffee knock box ninja11K/yr
- ninja coffee knock box6K/yr
- ninja knock box coffee4K/yr
Top ninja knock box 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 8 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Ninja Luxe Café Knock Box Holds 10 Double Shot Pucks XSKKNOCKBOX
Ninja£26.144.7★1,239 rev
Ninja XSKKNCKBXEUK Knock Box Stainless Steel
Ninja£25.004.8★104 rev
Coffee Grounds Knock Box - Stainless Steel Espresso Knock Box with Removable Knock Bar and Coffee Brush Non-Slip Base Knock Container Espresso Dump Bin Grind Waste Bin Coffee Maker Accessories
smallwell£11.064.1★79 rev
Coffee Knock Box - 4.8 Inch Espresso Grounds Bin With Removable Metal Bar Shock-Absorbent Barista Accessory for Coffee Machines
Ailelan£12.424.7★1,718 rev
Ideal Swan Barista Style Espresso Knock Box - 4.8 Inch Shock-Absorbent Coffee Bin with Removable Metal Knock Bar and Non-Slip Base (Black)
Ideal Swan£11.794.6★2,078 rev
Newest
by launch date
brikinte Silicone Espresso Knock Box for Ninja Luxe Espresso Accessories
brikinte£14.2738 rev
Coffee Grounds Knock Box - Stainless Steel Espresso Knock Box with Removable Knock Bar and Coffee Brush Non-Slip Base Knock Container Espresso Dump Bin Grind Waste Bin Coffee Maker Accessories
smallwell£11.0679 rev
Ninja XSKKNCKBXEUK Knock Box Stainless Steel
Ninja£25.00104 rev
Coffee Knock Box 1.2L Stainless Steel Espresso Box Container for Portafilter Puck Coffee Grounds Collector Coffee Bin for Ninja Sage Coffee Machine Silver
NOTSEK£14.07111 rev
Ninja Luxe Café Knock Box Holds 10 Double Shot Pucks XSKKNOCKBOX
Ninja£26.141,239 rev
Trending
90-day click momentumNinja XSKKNCKBXEUK Knock Box Stainless Steel
Ninja£25.004.8★
Coffee Knock Box 1.2L Stainless Steel Espresso Box Container for Portafilter Puck Coffee Grounds Collector Coffee Bin for Ninja Sage Coffee Machine Silver
NOTSEK£14.074.4★
Coffee Knock Box - 4.8 Inch Espresso Grounds Bin With Removable Metal Bar Shock-Absorbent Barista Accessory for Coffee Machines
Ailelan£12.424.7★
Coffee Grounds Knock Box - Stainless Steel Espresso Knock Box with Removable Knock Bar and Coffee Brush Non-Slip Base Knock Container Espresso Dump Bin Grind Waste Bin Coffee Maker Accessories
smallwell£11.064.1★
brikinte Silicone Espresso Knock Box for Ninja Luxe Espresso Accessories
brikinte£14.274.4★
What buyers say about ninja knock box
What buyers praise and complain about, mined from review topics.What buyers love
“Good quality for home barista setup”
“inexpensive that blends into a home setup”
“is a sturdy bit of kit”
“easy to clean”
“It does the job”
“Convenient holder for used coffee”
“Its the right size”
“Good functionality and sturdily made”
“Well designed”
“performs good”
What buyers complain about
“Bit pricey”
“Broke after 3 months”
“Small”
“Made of plastic”
“Feels and looks a bit cheap”
“not sure if it is dishwasher safe”
“Feels wobbly when you pick it up”
“For cleaning, it just needs running under the tap to get rid of any residual coffee beans -”
“so the smell of coffee grounds does permeable from it a bit”
Top return reasons
Common questions
- Is ninja knock box profitable to sell on Amazon United Kingdom?
- The niche generates £55K/yr across 8 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -33.5%. Flapen's verdict: Skip it (37/100).
- How competitive is the ninja knock box niche?
- 7 brands and 19 sellers compete. The top 5 products take 91% of clicks and top 5 brands hold 94% of demand.
- What do buyers complain about in ninja knock box?
- Top complaints mined from reviews: Value For Money, Durability, Size-Overall. The return rate is 0.9%.
- What does it cost to enter the ninja knock box niche?
- Listings span £9.46–£26.14; the average listing price is £15.53 (sweet spot $15–$100). The average incumbent carries 754 reviews — the moat a new listing must climb.