Is 21st birthday cake topper profitable to sell on Amazon United Kingdom?

The niche generates £48K/yr across 39 tracked products. 0 of 8 products launched in the last 360 days are still selling. 90-day search growth is -8.5%. Flapen's verdict: Skip it (49/100).

How competitive is the 21st birthday cake topper niche?

27 brands and 30 sellers compete. The top 5 products take 43% of clicks and top 5 brands hold 56% of demand.

What do buyers complain about in 21st birthday cake topper?

Top complaints mined from reviews: Strength, Size-Overall, Quality-Overall. The return rate is 0.3%.

When does demand for 21st birthday cake topper peak?

Demand peaks in Jan; the busiest month runs 1.5× the quietest.

What does it cost to enter the 21st birthday cake topper niche?

Listings span £2.79–£6.35; the average listing price is £4.03 (sweet spot $15–$100). The average incumbent carries 1,230 reviews — the moat a new listing must climb.

21st birthday cake topper

Skip it

Prices mostly outside the sweet spot ($2.79–$6.35) — this niche doesn't clear our bar today.

Returns

Incredible0.3%

return rate — above 5% kills the launch gate

Conversion

Great9.1%

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

Brand share

Great56%

top-5 brand share — no brand owns this niche

Competition

Good43%

top-5 click share — leaders hold, buyers still browse

Review moat

Good1,229.77

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Growth

Bad-8.5%

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

Market size

Bad£48K

£48K/yr · 131K searches

Avg price

Bad£4.03

avg listing price — sweet spot $15–$100

Price range

Bad£2.79–£6.35

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

Signals No Dominant Brand Low Review Barrier

According to Flapen's Amazon United Kingdom niche tracking, 21st birthday cake topper is a £48K/yr Amazon United Kingdom market (131K searches/yr). The top 5 brands hold 56% of demand. Demand peaks in Jan. Verdict: Skip it — 49/100.

Data updated Jul 24, 2026 · scored weekly · How we score niches

21st birthday cake topper market data

Units sold / yr: 8K–10K; avg 100–250/product
Revenue / yr: £32K–£40K; units × avg price
Conversion rate: 9.1%
Avg BSR: #757
Page quality: 0%
Prime: 92%
Sponsored: 92%
Out of stock: 5.9%
Avg brand age: 21 months
Avg seller age: 196 days

Competition & brand share

The top 5 products take 43% of clicks — established leaders, but buyers still shop beyond them.

Brands

27 falling

Sellers

Top-5 brand share

56%

Top 20: 93%

Top-5 click share

43%

Top 20: 76%

Open market

41%

YQ-BEST15%
Nogeqi15%
Gyufise13%
EDSG7%
bng-bng6%
RETWOT4%

Demand & seasonality

Weekly Amazon search volume, last 69 weeks — -8.5% search growth over the last 90 days.

Peak months: Jan · busiest ÷ quietest = 1.5×

Open Trend

Top 21st birthday cake topper search terms

21st birthday cake topper28K/yr -8.0%6.5% conv.
21 cake topper18K/yr -5.7%6.0% conv.
21st cake toppers for her16K/yr -13.9%5.3% conv.
happy 21st birthday cake topper14K/yr -6.2%7.2% conv.
21st birthday cake decorations10K/yr +0.6%2.8% conv.
21st cake topper10K/yr +9.9%5.4% conv.
21st cake toppers for him11K/yr -19.5%6.9% conv.
21 cake topper for her6K/yr -7.4%5.8% conv.
21st birthday cake toppers6K/yr -22.4%2.2% conv.
21st birthday cake toppers for her4K/yr -3.9%4.9% conv.

All search terms

Top 21st birthday cake topper 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

Gold Glitter Acrylic Twenty One Cake Topper 21th Birthday Cake Toppers 21th Anniversary Party Decorations Supplies

YQ-BEST£3.324.0★85 rev

Nogeqi Glitter 21st Birthday Cake Decorations Happy 21st Birthday Cake Topper for Birth Day Anniversary Party Supplies (Black Gold)

Nogeqi£3.354.4★63 rev

bng-bng 21st Birthday Cake Topper Decoration Rose Gold Glittery Happy 21st Birthday Cake Cupcake Toppers For Girls 21 Twenty-one Years Old Party Supplies Decorations

bng-bng£4.204.7★28 rev

Personalised Happy Birthday Cake Topper Customised with Any Age Name Party Cake Decoration 16 18 21 40 60 Double Sided Glitter Card Rose Gold

EDSG£4.124.7★13,123 rev

SYKYCTCY 1 Pack Happy 21th Birthday Cake Topper Glitter Heels Girls Bachelorette Cake Pick Cake Decorations for Girls Ladies Twenty-One Years Old Birthday Theme Party Supplies Rosegold

SYKYCTCY£4.174.6★287 rev

Newest

by launch date

Happy Birthday Cake Topper 21th 20 Pieces Cake Decoration Gold Decoration 21th Birthday 21th Cake Topper with Birthday Candles for 21th Birthday Decoration Cake Decoration

PYAOGG£4.851 rev

3mo ago

Happy 21st Birthday Cake Topper Glitter 21 Cake Decoration for Birthday Anniversary Party Supplies (Black & Gold)

Matwsec£2.991 rev

3mo ago

21th Happy birthday Cake Topper 21th Birthday Decorations Black Gold Glitter Happy Birthdays Decorations Cheers to 21 Years Birthdays Cakes Topper Cake Gift Plugin Anniversary Party Cakes Supplies

Xthrotsenk£2.877 rev

10mo ago

Black Happy 21st Birthday Cake Topper 21st Birthday Cake Decoration Set HSC 17PSC Black White Glitter Paper CupcakeToppers with Star Heart Paper Fan Balloon for 21 Years Old Party Decor

HSC£3.013 rev

11mo ago

21st Birthday Cake Topper Gold Acrylic Twenty One Cake Topper 21st Birthday Decorations for Her Personalised Happy Birthdays Glitter Cakes Toppers Party Decor Supplies

JEKUGOT£3.3615 rev

1y ago

What buyers say about 21st birthday cake topper

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

What buyers love

Advertised Vs Actual Product29%

“As advertised”

Quality-Overall27%

“Great quality and arrived quicker than anticipated”

Value For Money11%

“great value for money”

Color6%

“Really pretty”

Design-Overall5%

“This cake topper looks lovely”

Strength4%

“sturdy enough”

Brightness/Shine/Glow3%

“Nice & Bright”

Ease Of Use3%

“Easy to use”

Assembly/Installation3%

“Easy enough to assemble”

Size-Overall2%

“Great size for birthday cake stands out”

What buyers complain about

Strength37%

“flimsy”

Size-Overall15%

“smaller than expected”

Quality-Overall11%

“Cheap, flimsy and comes as a kit”

Adhesion/Stickiness11%

“quite complicated and needed more glue dots”

Assembly/Installation9%

“U needed to assemble it”

Value For Money3%

“Not worth it”

Thickness3%

“Very cheap thin card”

Advertised Vs Actual Product3%

“Not what I was expecting”

Top return reasons

Defective Material/Parts23%

Quality-Overall14%

Shape/Style14%

Strength9%

Color9%

Advertised Vs Actual Product9%

Functionality-Overall5%

Unsustainable Design5%

Inflation/Deflation5%

Value For Money5%

Common questions

Is 21st birthday cake topper profitable to sell on Amazon United Kingdom?: The niche generates £48K/yr across 39 tracked products. 0 of 8 products launched in the last 360 days are still selling. 90-day search growth is -8.5%. Flapen's verdict: Skip it (49/100).
How competitive is the 21st birthday cake topper niche?: 27 brands and 30 sellers compete. The top 5 products take 43% of clicks and top 5 brands hold 56% of demand.
What do buyers complain about in 21st birthday cake topper?: Top complaints mined from reviews: Strength, Size-Overall, Quality-Overall. The return rate is 0.3%.
When does demand for 21st birthday cake topper peak?: Demand peaks in Jan; the busiest month runs 1.5× the quietest.
What does it cost to enter the 21st birthday cake topper niche?: Listings span £2.79–£6.35; the average listing price is £4.03 (sweet spot $15–$100). The average incumbent carries 1,230 reviews — the moat a new listing must climb.