castile soap
Skip itBrand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Great8.2%search→purchase rate — share of searches ending in a sale
Price range
Good£4.74–£33.20cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Good£12.71avg listing price — sweet spot $15–$100
Growth
Good+23.2%90-day search growth — must beat 0% to launch
Market size
Okay£194K£194K/yr · 187K searches
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Review moat
Bad4,610.55avg incumbent reviews — the moat a new listing must climb
Competition
Bad81%top-5 click share — a locked-up shelf
Brand share
Bad97%top-5 brand share — brand-locked demand
According to Flapen's Amazon United Kingdom niche tracking, castile soap is a £194K/yr Amazon United Kingdom market (187K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 45/100.
Data updated Jul 18, 2026 · scored weekly · How we score niches
castile soap market data
- Units sold / yr
- 13K–15K
- avg 1,000–1,250/product
- Revenue / yr
- £159K–£191K
- units × avg price
- Conversion rate
- 8.2%
- Avg BSR
- #103
- Page quality
- 0%
- Prime
- 82%
- Sponsored
- 27%
- Out of stock
- 5.8%
- Avg brand age
- 52 months
- Avg seller age
- 171 days
Competition & brand share
The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.Brands
6 flat
Sellers
31
Top-5 brand share
97%
Top 20: 100%
Top-5 click share
81%
Top 20: 100%
Open market
0%
- The Soapery53%
- freshskin beauty ltd28%
- Naissance7%
- Dr. Bronner's6%
- Suezbana3%
- Kirk's3%
- Open — no brand owns it (0%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +23.2% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.5×
Top castile soap search terms
- castile soap78K/yr
- castile liquid soap53K/yr
- the soapery19K/yr
- liquid castile soap7K/yr
- castile soap liquid7K/yr
- castille soap7K/yr
- pure castile soap4K/yr
- castile soap organic6K/yr
- soapery5K/yr
Top castile soap 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 11 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Castile Liquid Soap Base 1 Litre - Organic SLS SLES Sulphate and Paraben Free
The Soapery£8.034.6★3,588 rev
Freshskin Beauty LTD | 1 Litre Organic Liquid Castile Soap (1000ml) - All-Natural Unscented Liquid Soap - Pure SLS SLES Free - Vegan Friendly - 100% Organic
freshskin beauty ltd£7.984.6★484 rev
Freshskin Beauty LTD | 100ml Organic Liquid Castile Soap - All-Natural Unscented Liquid Soap - Pure SLS SLES Free - Vegan Friendly - 100% Organic
freshskin beauty ltd£4.744.6★484 rev
Castile Liquid Soap Base 5 Litre - Organic SLS SLES Sulphate and Paraben Free
The Soapery£24.014.6★3,588 rev
Castile Liquid Soap Base 500ml - Organic SLS SLES Sulphate and Paraben Free
The Soapery£6.634.6★3,588 rev
Newest
by launch dateCastile Liquid Soap Base 1 Litre - Organic SLS SLES Sulphate and Paraben Free
The Soapery£8.033,588 rev
Castile Liquid Soap Base 5 Litre - Organic SLS SLES Sulphate and Paraben Free
The Soapery£24.013,588 rev
Castile Liquid Soap Base 500ml - Organic SLS SLES Sulphate and Paraben Free
The Soapery£6.633,588 rev
Naissance Liquid Castile Soap (No. 407) - 5 Litres - Natural Certified Organic Fragrance Free - Vegan SLS and SLES Free
Naissance£33.201,822 rev
Suezbana Liquid Castile Soap Organic 1Kg
Suezbana£14.74275 rev
Trending
90-day click momentum
Kirks Natural Original Castile Soap 113g (Pack of 3)
Kirk's£8.654.5★
Freshskin Beauty LTD | 100ml Organic Liquid Castile Soap - All-Natural Unscented Liquid Soap - Pure SLS SLES Free - Vegan Friendly - 100% Organic
freshskin beauty ltd£4.744.6★
Freshskin Beauty LTD | 1 Litre Organic Liquid Castile Soap (1000ml) - All-Natural Unscented Liquid Soap - Pure SLS SLES Free - Vegan Friendly - 100% Organic
freshskin beauty ltd£7.984.6★
Castile Liquid Soap Base 500ml - Organic SLS SLES Sulphate and Paraben Free
The Soapery£6.634.6★
Naissance Organic Liquid Castile Soap (no. 407) - 870ml - Natural Vegan Unscented SLS and SLES Free - for Homemade Beauty Hand Wash Dish Soap
Naissance£12.354.6★
What buyers say about castile soap
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent soap”
“Money saving”
“The product works as it is advertise”
“Great, ready to make my own cleaning products”
“has a good lather”
“Very gentle for hands and body”
“non-toxic home cleaning products”
“smells great far too nice for my greenhouse”
“Works well for home made cleaning spray”
“Sparkling”
What buyers complain about
“Do not waste your money”
“My skin hasnt felt so good”
“I feel like that's silly to advertise that way”
“Poor quality and price is high”
“after a few uses i noticed a lot of hair in my hairbrush”
“I find it is thicker than the other brand I got from here”
“Watered down and more glycerin than anything else”
“greasy and disgusting”
“it has a consistency that is very liquidy”
Top return reasons
Common questions
- Is castile soap profitable to sell on Amazon United Kingdom?
- The niche generates £194K/yr across 11 tracked products. 90-day search growth is +23.2%. Flapen's verdict: Skip it (45/100).
- How competitive is the castile soap niche?
- 6 brands and 31 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 97% of demand.
- What do buyers complain about in castile soap?
- Top complaints mined from reviews: Value For Money, Skin Health, Advertised Vs Actual Product. The return rate is 0.0%.
- When does demand for castile soap peak?
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- What does it cost to enter the castile soap niche?
- Listings span £4.74–£33.20; the average listing price is £12.71 (sweet spot $15–$100). The average incumbent carries 4,611 reviews — the moat a new listing must climb.