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54

letter stamps

Worth a look

Shows low returns (1.0%), but soft demand (-16.5% this quarter) keeps it on the watch list.

Market size 50Growth 17Conversion 50Competition 58Returns 95Price range 56Avg price 59Brand share 80Review moat 32Quality gap 58

Returns

Great1.0%

return rate — above 6% kills the launch gate

Brand share

Great55%

top-5 brand share — no brand owns this niche

Avg price

Good$13.04

avg listing price — sweet spot $15–$100

Competition

Good50%

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

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Price range

Good$5.43–$27.17

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

Market size

Good$286K

$286K/yr · 551K searches

Conversion

Okay4.0%

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

Review moat

Okay3,340.97

avg incumbent reviews — the moat a new listing must climb

Growth

Bad-16.5%

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

Competition

The top 5 products take 50% of clicks — established leaders, but buyers still shop beyond them.

Brands

31 falling

Sellers

62

Top-5 brand share

55%

Open market

42%

  • krastmon16%
  • Opvixi13%
  • OJYUDD12%
  • Melissa & Doug8%
  • Wiratca7%
  • YIKANGHENG3%

Product shelf

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%4%$11K8%$23K12%$34K16%$46K1101001K10K100K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 35 tracked products in this niche — three views at once, no toggling.

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -16.5% search growth over the last 90 days.
15K10KSpike '24Black Friday '24Spike '25Prime Day '25Black Friday '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Jan, Nov, Dec · busiest ÷ quietest = 1.7×

Reviews

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

What buyers love

Quality-Overall18%

“Nice quality and easy to use”

Advertised Vs Actual Product14%

“As advertised”

Print Quality11%

“Prints perfect”

Value For Money9%

“GOOD VALUE”

Ease Of Use9%

“easy to handle”

Size-Overall7%

“Good size”

Efficiency4%

“it worked perfectly”

Fun/Entertainment Experience2%

“fun for my toddler”

Functionality-Overall2%

“should work out just fine for my needs”

Design-Overall1%

“good design”

What buyers complain about

Size-Overall30%

“To Small”

Quality-Overall11%

“Very poor quality control”

Print Quality10%

“It is poorly printed”

Ease Of Use4%

“hard to handle”

Functionality-Overall3%

“Doesn't work efficiently :”

Value For Money3%

“A little steep price wise”

Durability2%

“Falls apart”

Advertised Vs Actual Product2%

“Deceiving”

Writing Experience1%

“The writing is a little too close together so when using it can bleed into each other”

Cartridge/Ink Quality1%

“except the ink was a little light”

Top return reasons

Size-Overall51%
Functionality-Overall10%
Advertised Vs Actual Product7%
Print Quality6%
Value For Money3%
Quality-Overall3%
Ease Of Use3%
Defective Material/Parts3%
Material Quality2%
Assembly/Installation1%