Is s21 ultra case profitable to sell on Amazon United Kingdom?

The niche generates £82K/yr across 45 tracked products. 0 of 5 products launched in the last 360 days are still selling. 90-day search growth is -17.2%. Flapen's verdict: Skip it (48/100).

How competitive is the s21 ultra case niche?

38 brands and 47 sellers compete. The top 5 products take 36% of clicks and top 5 brands hold 37% of demand.

What do buyers complain about in s21 ultra case?

Top complaints mined from reviews: Size-Overall, Durability, Quality-Overall. The return rate is 2.9%.

When does demand for s21 ultra case peak?

Demand peaks in Sep; the busiest month runs 1.8× the quietest.

What does it cost to enter the s21 ultra case niche?

Listings span £3.09–£17.23; the average listing price is £8.96 (sweet spot $15–$100). The average incumbent carries 2,851 reviews — the moat a new listing must climb.

s21 ultra case

Skip it

Soft demand (-17.2% this quarter) — this niche doesn't clear our bar today.

Brand share

Incredible37%

top-5 brand share — no brand owns this niche

Competition

Great36%

top-5 click share — an open shelf

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Returns

Good2.9%

return rate — above 5% kills the launch gate

Conversion

Okay3.8%

search→purchase rate — share of searches ending in a sale

Review moat

Okay2,850.62

avg incumbent reviews — the moat a new listing must climb

Avg price

Okay£8.96

avg listing price — sweet spot $15–$100

Market size

Bad£82K

£82K/yr · 243K searches

Growth

Bad-17.2%

90-day search growth — must beat 0% to launch

Price range

Bad£3.09–£17.23

cheapest to priciest tracked listing — scored on the share inside $15–$100

Signals No Dominant Brand

According to Flapen's Amazon United Kingdom niche tracking, s21 ultra case is a £82K/yr Amazon United Kingdom market (243K searches/yr). The top 5 brands hold 37% of demand. Demand peaks in Sep. Verdict: Skip it — 48/100.

Data updated Jul 25, 2026 · scored weekly · How we score niches

s21 ultra case market data

Units sold / yr: 6K–8K; avg 100–250/product
Revenue / yr: £54K–£72K; units × avg price
Conversion rate: 3.8%
Avg BSR: #3,057
Page quality: 0%
Prime: 100%
Sponsored: 82%
Out of stock: 6.3%
Avg brand age: 38 months
Avg seller age: 196 days

Competition & brand share

Clicks spread well past the top 5 (36% combined) — an open shelf where new products get seen.

Brands

38 falling

Sellers

Top-5 brand share

37%

Top 20: 86%

Top-5 click share

36%

Top 20: 80%

Open market

57%

imluckies9%
HikerClub8%
Dexnor7%
GiiYoon7%
Spigen6%
KaiMai6%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -17.2% search growth over the last 90 days.

Peak months: Sep · busiest ÷ quietest = 1.8×

Open Trend

Top s21 ultra case search terms

samsung s21 ultra case85K/yr -18.4%2.3% conv.
s21 ultra phone case79K/yr -19.5%3.0% conv.
samsung galaxy s21 ultra case26K/yr -12.4%2.2% conv.
s21 ultra case20K/yr -15.8%2.8% conv.
galaxy s21 ultra case12K/yr -21.9%2.9% conv.
samsung galaxy s21 ultra 5g case10K/yr +1.0%1.6% conv.
samsung s21 ultra phone case10K/yr -12.1%2.4% conv.

All search terms

Top s21 ultra case 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

imluckies Shockproof Case for Samsung Galaxy S21 Ultra with Sliding Camera Cover Slim Fit& Scratch-Resistant Camera Lens Protection Case for Samsung Galaxy S21 Ultra 5G 6.8- Black

imluckies£9.124.4★7,212 rev

HikerClub Galaxy S21 Ultra 5G Case Compatible with Mag Safe Wireless Charger Translucent Frosted Matte Back Soft Silicone Frame Military Grade Shockproof Case Cover for Galaxy S21Ultra Matte Black

HikerClub£11.104.6★851 rev

Dexnor Case for Samsung Galaxy S21 Ultra 5G 6.8 Inch with Built-in Screen Protector Military Grade Armour Heavy Duty 360 Full Body Shockproof Bumper Protection Cover with Stand - Black

Dexnor£15.944.1★4,705 rev

Spigen Rugged Armor Case for Samsung Galaxy S21 Ultra - Matte Black

Spigen£13.374.6★5,243 rev

KaiMai for Samsung S21 Ultra Case [10 FT Military Grade Drop Protection] [Non-Slip] [2 pcs TPE HD Screen Protector] Heavy Duty Full-Body Shockproof Case for Samsung Galaxy S21 Ultra 5G 6.8-Black

KaiMai£6.284.4★94 rev

Newest

by launch date

SUANDUCK for Samsung Galaxy S21 Ultra mobile phone case leather flip case with RFID-blocking card compartment adjustable stand and 360 drop protection with Samsung S21 Ultra Light Blue

SUANDUCK£17.239 rev

8mo ago

Pilaru Sliding Card Holder Case for Samsung S21 Ultra | Hidden Slot Cards | 2 screen protectors | Shockproof & Anti-Slip Protective Wallet Cover | Durable Dual-Layer Design for Galaxy S21 Ultra Black

Pilaru£7.67513 rev

9mo ago

for Samsung S21 Ultra Phone Case with Screen Protector:[Military Grade Drop Tested] Ring Holder Kickstand Shockproof Anti-Slip Protective Phone Case for Samsung Galaxy S21 Ultra 6.8- Blue

Jihucase£7.4427 rev

10mo ago

AWZHYDT for Samsung S21 Ultra 5G Case with 1 HD Screen Protector & Slide Camera Cover [Military-Grade] Phone Case Heavy Duty Rugged Shockproof Protective Cover for Samsung Galaxy S21 Ultra(Cyan/Pink)

AWZHYDT£8.2923 rev

1y ago

Jshru for Samsung S21 Ultra Case with Screen Protector-Camera Protective Cover Ring Stand Phone Case for Men and Women Shockproof Bumper Phone Cover for Samsung Galaxy S21 Ultra Black

Jshru£7.851,158 rev

1y ago

What buyers say about s21 ultra case

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall23%

“Good quality case”

Size-Overall22%

“Fits perfectly”

Drop/Impact Protection10%

“Nice protective case”

Strength9%

“Still going strong after 15 months”

Value For Money6%

“but still great value at current price”

Ease Of Use5%

“also practical”

Color4%

“Love the colour”

Advertised Vs Actual Product3%

“basically does what the description says it does”

Grip2%

“Good product I like the grip on the back too”

Touch/Button Controls1%

“Buttons react well”

What buyers complain about

Size-Overall11%

“It Does Not Fit The Phone”

Durability9%

“Failed on the second use in water”

Quality-Overall9%

“Terrible clip quality”

Ease Of Use6%

“it's also tough to close and open in general, I decided to just remove that piece completely for comfort and ease”

Functionality-Overall5%

“Doesn't stand up to the test”

Touch/Button Controls5%

“Ive previously had issues with the touch screen”

Mechanism Issues5%

“the kickstand at the back is loose already”

Compatibility-Overall4%

“It Does Not Fit The Phone”

Charging3%

“I minused 2 stars because the stand is so bulky its impossible to charge your phone wirelessly”

Assembly/Installation3%

“it's also near impossible to install without bubbles”

Top return reasons

Size-Overall44%

Compatibility-Overall10%

Quality-Overall8%

Magnetic Strength/Adsorption5%

Functionality-Overall5%

Advertised Vs Actual Product5%

Charging4%

Touch/Button Controls3%

Material Quality2%

Strength2%

Common questions

Is s21 ultra case profitable to sell on Amazon United Kingdom?: The niche generates £82K/yr across 45 tracked products. 0 of 5 products launched in the last 360 days are still selling. 90-day search growth is -17.2%. Flapen's verdict: Skip it (48/100).
How competitive is the s21 ultra case niche?: 38 brands and 47 sellers compete. The top 5 products take 36% of clicks and top 5 brands hold 37% of demand.
What do buyers complain about in s21 ultra case?: Top complaints mined from reviews: Size-Overall, Durability, Quality-Overall. The return rate is 2.9%.
When does demand for s21 ultra case peak?: Demand peaks in Sep; the busiest month runs 1.8× the quietest.
What does it cost to enter the s21 ultra case niche?: Listings span £3.09–£17.23; the average listing price is £8.96 (sweet spot $15–$100). The average incumbent carries 2,851 reviews — the moat a new listing must climb.