Is g-fun profitable to sell on Amazon Japan?

The niche generates ¥0/yr across 36 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -4.3%. Flapen's verdict: Skip it (38/100).

How competitive is the g-fun niche?

4 brands and 6 sellers compete. The top 5 products take 38% of clicks and top 5 brands hold 100% of demand.

What do buyers complain about in g-fun?

Top complaints mined from reviews: コストパフォーマンス, 強さ, 使用説明書/ユーザーマニュアル/トラブルシューティング. The return rate is 0.6%.

When does demand for g-fun peak?

Demand is steady year-round — the busiest month runs 1.3× the quietest.

What does it cost to enter the g-fun niche?

Listings span ¥113.75–¥16378.58; the average listing price is ¥1241.15 (sweet spot $15–$100). The average incumbent carries 13 reviews — the moat a new listing must climb.

g-fun

Skip it

A small market ($0/yr) — this niche doesn't clear our bar today.

Review moat

Incredible12.72

avg incumbent reviews — the moat a new listing must climb

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Quality gap

Great4.2★

avg incumbent rating — lower means beatable quality

Competition

Great38%

top-5 click share — an open shelf

Growth

Bad-4.3%

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

Market size

Bad¥0

¥0/yr · 63K searches

Conversion

Bad0.0%

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

Brand share

Bad100%

top-5 brand share — brand-locked demand

Avg price

Bad¥1241.15

avg listing price — sweet spot $15–$100

Price range

Bad¥113.75–¥16378.58

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

Signals Low Review Barrier High Price

According to Flapen's Amazon Japan niche tracking, g-fun is a ¥0/yr Amazon Japan market (63K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 38/100.

Data updated Jul 31, 2026 · scored weekly · How we score niches

g-fun market data

Units sold / yr: 1K–1K; avg 0–100/product
Revenue / yr: ¥1.2M–¥1.6M; units × avg price
Conversion rate: 0.0%
Avg BSR: #698
Page quality: 0%
Prime: 14%
Sponsored: 94%
Out of stock: 4.7%
Avg brand age: 33 months
Avg seller age: 209 days

Competition & brand share

Clicks spread well past the top 5 (38% combined) — an open shelf where new products get seen.

Brands

4 falling

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

38%

Top 20: 77%

Open market

G-Fun81%
G-fun11%
GFUN6%
zenHome2%

Demand & seasonality

Weekly Amazon search volume, last 66 weeks — -4.3% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top g-fun search terms

g-fun34K/yr +5.3%0.2% conv.
g-fun フレーム12K/yr -5.0%0.2% conv.
gfun12K/yr -28.3%0.1% conv.
g-fun コネクタ5K/yr -4.5%0.2% conv.

All search terms

Top g-fun 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★)1 product missing review or click data not plotted

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

Top sellers

by 90-day click share

【Sシリーズ】GFunフレームS 1900 SGF-0041 1900mm

G-Fun¥508.855.0★4 rev

【Nシリーズ】GFunフレームN 450 SGF-0004 450mm

G-Fun¥245.064.0★3 rev

【Nシリーズ】GFunマルチコネクタインナーR SGF-0009

G-Fun¥326.934.3★4 rev

GFUN トレーニングベルトパワーベルト 17cmの幅広設計軽量マジックテープ筋トレベルト腹筋ベルトウエストベルトジム筋トレグッズ初心者-プロ対応

GFUN¥1277.595.0★4 rev

【Nシリーズ】GFunフレームN 1000 SGF-0002 1000mm

G-Fun¥472.874.7★5 rev

Newest

by launch date

GFUN トレーニングベルトパワーベルト 17cmの幅広設計軽量マジックテープ筋トレベルト腹筋ベルトウエストベルトジム筋トレグッズ初心者-プロ対応

GFUN¥1277.594 rev

2mo ago

[zenHome] ジュートスリッパ麻鼻緒ルームサンダル室内履き軽量滑り止め男女兼用ブラック 25~26.5cm

zenHome¥1750.11183 rev

2y ago

【Sシリーズ】GFunフレームS 1900 SGF-0041 1900mm

G-Fun¥508.854 rev

2y ago

【Nシリーズ】GFunフレームN 450 SGF-0004 450mm

G-Fun¥245.063 rev

2y ago

【Nシリーズ】GFunフレームN 1000 SGF-0002 1000mm

G-Fun¥472.875 rev

2y ago

What buyers say about g-fun

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

What buyers love

使用の容易さ18%

“持ち運びもしまっておくのもとても楽ちんでした。組み立ても簡単なので、誰でも使いやすいと思いますよ。”

バランス/安定性15%

“安定感がいいです”

総合品質11%

“大変良い商品です。”

軽い11%

“軽量で持ち運びも楽”

持ち運びやすさ10%

“持ち運びは楽だけど少し低め”

コストパフォーマンス7%

“値段的にも、利便性的にも、金額的にも満足してます”

快適さ-全体6%

“足は楽です”

保管容量5%

“収納もコンパクト”

コンパクトさ3%

“収納もコンパクト”

組み立て/インストール3%

“組み立てが簡単で、安定感もいいです。”

What buyers complain about

コストパフォーマンス25%

“値段なりです”

強さ22%

“取手も脆そうですが”

使用説明書/ユーザーマニュアル/トラブルシューティング17%

“説明書がありません”

総合品質8%

“思ったよりもチープな作りで、思った通りくらいの強度。”

耐久性8%

“確かにコンパクトだが、プラの部品系はわりかしすぐに壊れそう。”

Top return reasons

サイズ全体18%

組み立て/インストール17%

不良材料/部品17%

色10%

柔軟性10%

使用の容易さ8%

広告と実際の製品の違い7%

強さ5%

接続性 - 全体5%

ゴムの品質3%

Common questions

Is g-fun profitable to sell on Amazon Japan?: The niche generates ¥0/yr across 36 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -4.3%. Flapen's verdict: Skip it (38/100).
How competitive is the g-fun niche?: 4 brands and 6 sellers compete. The top 5 products take 38% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in g-fun?: Top complaints mined from reviews: コストパフォーマンス, 強さ, 使用説明書/ユーザーマニュアル/トラブルシューティング. The return rate is 0.6%.
When does demand for g-fun peak?: Demand is steady year-round — the busiest month runs 1.3× the quietest.
What does it cost to enter the g-fun niche?: Listings span ¥113.75–¥16378.58; the average listing price is ¥1241.15 (sweet spot $15–$100). The average incumbent carries 13 reviews — the moat a new listing must climb.

g-fun

g-fun market data

Competition & brand share

Demand & seasonality

Top g-fun search terms

Top g-fun products on Amazon

Top sellers

Newest

Trending

What buyers say about g-fun

What buyers love

What buyers complain about

Top return reasons

Common questions

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