---
title: "Seint — $102K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/beauty-personal-care/seint"
last_updated: "2026-08-06T16:52:15.650Z"
locale: en
meta:
description: "Niche score 33/100 · $102K/yr market · 156K searches/yr · $12.38 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 33/100 · $102K/yr market · 156K searches/yr · $12.38 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Seint — $102K/yr Amazon US Niche (2026) - Flapen"
---
# **seint**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 25Growth 23Conversion 61Competition 4Returns 96Price range 56Avg price 53Brand share 0Review moat 17Quality gap 33
**Returns**
**Incredible****0.8%**
return rate — above 5% kills the launch gate
**Conversion**
**Good****5.3%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Good****$5.29–$27.35**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Good****$12.38**
avg listing price — sweet spot $15–$100
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Market size**
**Okay****$102K**
$102K/yr · 156K searches
**Growth**
**Bad****-4.5%**
90-day search growth — must beat 0% to launch
**Review moat**
**Bad****18,721**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Bad****96%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, seint is a $102K/yr Amazon United States market (156K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Aug–Sep. Verdict: Skip it — 33/100.
Data updated Jul 22, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **seint market data**
- **Units sold / yr**
- **6K–8K**
- avg 750–1,000/product
- **Revenue / yr**
- **$74K–$99K**
- units × avg price
- **Conversion rate**
- **5.3%**
- **Avg BSR**
- **#100**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **63 months**
- **Avg seller age**
- **134 days**
## **Competition & brand share**
The top 5 products capture 96% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**3 **▲rising
**Sellers**
**66**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**96%**
Top 20: 100%
**Open market**
**0%**
- NYX PROFESSIONAL MAKEUP76% - MAC17% - Kiss7%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -4.5% search growth over the last 90 days.
13K8KSpike '24Spike '25Prime Day '25Black Friday '25 seasonSepDecMarJunAugNovMarMay
Peak months: Aug, Sep · busiest ÷ quietest = 2.5×
[**Open Trend **](https://flapen.com/research/us/beauty-personal-care/seint/trend)
## **Top seint search terms**
- **nyx nude truffle**19K/yr+22.2%1.3% conv. - **nyx peekaboo neutral lip liner**15K/yr+13.3%14.7% conv. - **mac cool spice lipliner**17K/yr-5.1%3.1% conv. - **nyx truffle lip liner**12K/yr-19.8%1.1% conv. - **nude truffle**10K/yr+13.6%1.4% conv. - **nude truffle nyx**10K/yr-0.8%1.0% conv. - **mac spice lip liner pencil**12K/yr-18.0%5.8% conv. - **nyx slim lip pencil peekaboo neutral**3K/yr+44.5%14.1% conv. - **cool spice lip liner mac**8K/yr+2.8%2.5% conv. - **nyx nude beige**7K/yr-26.9%1.2% conv. [**All search terms **](https://flapen.com/research/us/beauty-personal-care/seint/search-terms)
## **Top seint 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.
0%20%$20K40%$41K60%$61K80%$82K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 6 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**NYX PROFESSIONAL MAKEUP Slim Lip Pencil Long-Lasting Creamy Lip Liner - Peakaboo Neutral**NYX PROFESSIONAL MAKEUP**$5.74**4.5★52,571 rev](https://www.amazon.com/dp/B07B16HMSM) [2**M.A.C Lip Pencil Spice 1 Count**MAC**$24.37**4.6★570 rev](https://www.amazon.com/dp/B0002DNZDE) [3**Kiss New York Professional Slim Long-Wear Lip Liner Pencil Matte Finish**Kiss**$5.29**4.4★738 rev](https://www.amazon.com/dp/B0BVDGYK6G) [4**NYX PROFESSIONAL MAKEUP Slim Lip Pencil Long-Lasting Creamy Lip Liner - Nude Pink**NYX PROFESSIONAL MAKEUP**$5.40**4.5★52,571 rev](https://www.amazon.com/dp/B079ZX2WJ7) [5**MAC Lip Pencil - Cool spice (Deep brown mauve) .05 Oz/ 1.45g**MAC**$27.35**4.7★14 rev](https://www.amazon.com/dp/B0FKK6GG32)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**MAC Lip Pencil - Cool spice (Deep brown mauve) .05 Oz/ 1.45g**MAC**$27.35**14 rev11mo ago](https://www.amazon.com/dp/B0FKK6GG32) [**Kiss New York Professional Slim Long-Wear Lip Liner Pencil Matte Finish**Kiss**$5.29**738 rev3y ago](https://www.amazon.com/dp/B0BVDGYK6G) [**NYX PROFESSIONAL MAKEUP Slim Lip Pencil Long-Lasting Creamy Lip Liner - Peakaboo Neutral**NYX PROFESSIONAL MAKEUP**$5.74**52,571 rev8y ago](https://www.amazon.com/dp/B07B16HMSM) [**NYX PROFESSIONAL MAKEUP Slim Lip Pencil Long-Lasting Creamy Lip Liner - Nude Pink**NYX PROFESSIONAL MAKEUP**$5.40**52,571 rev8y ago](https://www.amazon.com/dp/B079ZX2WJ7) [**NYX PROFESSIONAL MAKEUP Suede Matte Lip Liner Velvety-Smooth Long-Lasting Formula For A Defined Lip Makeup Look - Sandstorm (Brown)**NYX PROFESSIONAL MAKEUP**$6.11**5,862 rev9y ago](https://www.amazon.com/dp/B01M9F9UNB)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**NYX PROFESSIONAL MAKEUP Suede Matte Lip Liner Velvety-Smooth Long-Lasting Formula For A Defined Lip Makeup Look - Sandstorm (Brown)**NYX PROFESSIONAL MAKEUP**$6.11**4.6★**▲ 146%**](https://www.amazon.com/dp/B01M9F9UNB) [**Kiss New York Professional Slim Long-Wear Lip Liner Pencil Matte Finish**Kiss**$5.29**4.4★**▲ 26%**](https://www.amazon.com/dp/B0BVDGYK6G) [**M.A.C Lip Pencil Spice 1 Count**MAC**$24.37**4.6★**▲ 19%**](https://www.amazon.com/dp/B0002DNZDE) [**MAC Lip Pencil - Cool spice (Deep brown mauve) .05 Oz/ 1.45g**MAC**$27.35**4.7★**▲ 14%**](https://www.amazon.com/dp/B0FKK6GG32) [**NYX PROFESSIONAL MAKEUP Slim Lip Pencil Long-Lasting Creamy Lip Liner - Peakaboo Neutral**NYX PROFESSIONAL MAKEUP**$5.74**4.5★**— 1%**](https://www.amazon.com/dp/B07B16HMSM)
**~~View all trending →~~**
## **What buyers say about seint**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Color**32%
*“Love the color”*
**Soft Feel**11%
*“its super creamy”*
**Quality-Overall**11%
*“Overall, it's still a really nice lip liner for the price and finish”*
**Value For Money**8%
*“Good bang for your buck”*
**Coverage**7%
*“Great coverage”*
**Durability**7%
*“lasts a long time”*
**Texture/Consistency-Overall**5%
*“Great texture, goes on so smooth and even”*
**Ease Of Use**4%
*“Just as easy as purchasing at the MAC Store”*
**Eyeliner Quality**3%
*“Pretty color I use it as eyeliner for my waterline”*
**Ease Of Application**3%
*“It applies easily”*
### **What buyers complain about **
**Color**46%
*“shade is too dark”*
**Durability**8%
*“Doesnt last”*
**Quality-Overall**7%
*“Not the best”*
**Advertised Vs Actual Product**7%
*“does not appear as described”*
**Thickness**7%
*“My villainously thin lips have been fixed”*
**Moist/Dry**6%
*“The desert in a stick, dry, difficult to apply to lips”*
**Allergies**3%
*“allergic to it”*
**Hard Feel**2%
*“you have to press so hard with the NYX”*
### **Top return reasons **
**Color**67%
**Advertised Vs Actual Product**9%
**Moist/Dry**6%
**Ease Of Application**2%
**Value For Money**2%
**Functionality-Overall**2%
**Quality-Overall**2%
**Hard Feel**1%
**Product Condition**1%
**Weight Light**1%
## **Common questions**
- **Is seint profitable to sell on Amazon United States?**
- The niche generates $102K/yr across 6 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -4.5%. Flapen's verdict: Skip it (33/100).
- **How competitive is the seint niche?**
- 3 brands and 66 sellers compete. The top 5 products take 96% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in seint?**
- Top complaints mined from reviews: Color, Durability, Quality-Overall. The return rate is 0.8%.
- **When does demand for seint peak?**
- Demand peaks in Aug–Sep; the busiest month runs 2.5× the quietest.
- **What does it cost to enter the seint niche?**
- Listings span $5.29–$27.35; the average listing price is $12.38 (sweet spot $15–$100). The average incumbent carries 18,721 reviews — the moat a new listing must climb.
## **Related niches in Beauty & Personal Care**
- 75 [**bio oil lotion**](https://flapen.com/research/us/beauty-personal-care/bio-oil-lotion)$654K/yr+95.9%**Worth a look**- 75 [**glossier futuredew serum**](https://flapen.com/research/us/beauty-personal-care/glossier-futuredew-serum)$344K/yr+383.6%**Worth a look**- 75 [**press on toenails**](https://flapen.com/research/us/beauty-personal-care/press-on-toenails)$2.4M/yr+79.4%**Launch it**- 75 [**skulta deep peptide eye mask**](https://flapen.com/research/us/beauty-personal-care/skulta-deep-peptide-eye-mask)$58K/yr>1,000%**Worth a look**- 75 [**mineral sunscreen spray**](https://flapen.com/research/us/beauty-personal-care/mineral-sunscreen-spray)$3.8M/yr+183.8%**Launch it**- 76 [**collagen oil**](https://flapen.com/research/us/beauty-personal-care/collagen-oil)$344K/yr+116.2%**Worth a look**[**All Beauty & Personal Care niches **](https://flapen.com/research/us/beauty-personal-care)