---
title: "S21 Ultra Screen Protector — $338K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/cell-phones-accessories/s21-ultra-screen-protector"
last_updated: "2026-08-09T15:06:53.914Z"
locale: en
meta:
description: "Niche score 56/100 · $338K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 56/100 · $338K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "S21 Ultra Screen Protector — $338K/yr Amazon US Niche (2026) - Flapen"
---
# **s21 ultra screen protector**
**Worth a look**
Shows searches that convert (12.5% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 53Growth 22Conversion 95Competition 37Returns 74Price range 58Avg price 42Brand share 70Review moat 22Quality gap 95
**Conversion**
**Incredible****12.5%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Incredible****4.0★**
avg incumbent rating — lower means beatable quality
**Returns**
**Good****2.0%**
return rate — above 5% kills the launch gate
**Brand share**
**Good****63%**
top-5 brand share — brands hold most of the demand
**Price range**
**Good****$7.12–$25.92**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Good****$338K**
$338K/yr · 245K searches
**Avg price**
**Okay****$11.02**
avg listing price — sweet spot $15–$100
**Competition**
**Okay****63%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Bad****-7.0%**
90-day search growth — must beat 0% to launch
**Review moat**
**Bad****8,890.05**
avg incumbent reviews — the moat a new listing must climb
**Signals**[** Quality Gap**](https://flapen.com/research/niches?market=us&signal=quality_gap "Avg rating < 4.0")
According to Flapen's Amazon United States niche tracking, s21 ultra screen protector is a $338K/yr Amazon United States market (245K searches/yr). The top 5 brands hold 63% of demand. Demand peaks in Jul–Aug. Verdict: Worth a look — 56/100.
Data updated Jul 6, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **s21 ultra screen protector market data**
- **Units sold / yr**
- **30K–40K**
- avg 1,250–1,500/product
- **Revenue / yr**
- **$331K–$441K**
- units × avg price
- **Conversion rate**
- **12.5%**
- **Avg BSR**
- **#1,221**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **85%**
- **Out of stock**
- **33.7%**
- **Avg brand age**
- **33 months**
- **Avg seller age**
- **195 days**
## **Competition & brand share**
The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**18 **—flat
**Sellers**
**24**
**Top-5 brand share**
**63%**
Top 20: 100%
**Top-5 click share**
**63%**
Top 20: 100%
**Open market**
**32%**
- Samcorn30% - LK16% - WILLONE7% - MAGIC JOHN6% - QoeCycth5% - Supershieldz5%
## **Demand & seasonality**
Weekly Amazon search volume, last 101 weeks — -7.0% search growth over the last 90 days.
13K8KPrime Day '25 seasonDecMarJunAugNovMarMay
Peak months: Jul, Aug · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/us/cell-phones-accessories/s21-ultra-screen-protector/trend)
## **Top s21 ultra screen protector search terms**
- **s21 ultra screen protector**91K/yr-5.8%10.8% conv. - **samsung galaxy s21 ultra screen protector**42K/yr-5.7%11.4% conv. - **galaxy s21 ultra screen protector**35K/yr-7.9%12.6% conv. - **samsung s21 ultra screen protector**34K/yr-15.8%12.5% conv. - **galaxy s21 ultra 5g screen protector**10K/yr-5.3%10.7% conv. - **screen protector s21 ultra**9K/yr+0.3%9.8% conv. - **screen protector samsung s21 ultra**7K/yr+5.0%10.0% conv. - **samsung galaxy s21 ultra 5g screen protector**6K/yr+10.1%8.6% conv. - **screen protector galaxy s21 ultra**4K/yr+2.8%10.9% conv. - **s21 ultra 5g screen protector**4K/yr-20.9%12.8% conv. [**All search terms **](https://flapen.com/research/us/cell-phones-accessories/s21-ultra-screen-protector/search-terms)
## **Top s21 ultra screen protector 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%10%$34K20%$68K30%$101K40%$135K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 20 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**3 Pack Galaxy S21 Ultra Screen Protector HD Clear Tempered Glass Fingerprint Unlock 3D Curved Scratch Resistant No Bubble for Samsung Galaxy S21 Ultra 5G Glass Screen Protector**Samcorn**$10.15**4.3★8,950 rev](https://www.amazon.com/dp/B0GFDM84Q2) [2![LK 3 Pack for Samsung Galaxy S21 Ultra Screen Protector [Not Glass] New Version for Support Fingerprint Unlock Bubble Free with Easy Installation Tool 3D Curved Max Coverage for S21 Ultra](https://m.media-amazon.com/images/I/51No11RSsNL.jpg)**LK 3 Pack for Samsung Galaxy S21 Ultra Screen Protector \[Not Glass\] New Version for Support Fingerprint Unlock Bubble Free with Easy Installation Tool 3D Curved Max Coverage for S21 Ultra**LK**$9.47**4.3★9,696 rev](https://www.amazon.com/dp/B08PYRXVBW) [3**WILLONE 2+2 Pack for Samsung Galaxy S21 Ultra 5G Screen Protector (6.80 inches) with Camera Lens Protector Case Friendly Tempered Glass Film Fingerprint Unlock HD Clear**WILLONE**$10.04**4.6★30,442 rev](https://www.amazon.com/dp/B0GTTSR51Q) [4![MAGIC JOHN 2 Pack for Samsung Galaxy S21 Ultra Screen Protector [Ceramic Film Material Not Glass] 6.8 inch [100% Fingerprint ID Compatible] Easy Installation Tray Shock-Resistant 3D Curved Bubble](https://m.media-amazon.com/images/I/51OrGZXXb8L.jpg)**MAGIC JOHN 2 Pack for Samsung Galaxy S21 Ultra Screen Protector \[Ceramic Film Material Not Glass\] 6.8 inch \[100% Fingerprint ID Compatible\] Easy Installation Tray Shock-Resistant 3D Curved Bubble**MAGIC JOHN**$16.41**4.0★960 rev](https://www.amazon.com/dp/B0C9CGRP2P) [5**3 Pack Curved Tempered Glass Screen Protector Applicable for Samsung Galaxy S21 Ultra 5G 6.8inch Support Fingerprint ID Friendly Tempered Glass Screen Protective HD Clear Scratch Resistant Suitable**QoeCycth**$8.04**3.6★3,114 rev](https://www.amazon.com/dp/B0CLGNJ2TS)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Didisky 3+2 Pack Screen Protector for Samsung Galaxy S21 Ultra Tempered Glass and Camera Lens Protector 3D Curved Full Coverage Easy to Use Bubble Free 9H Scratch-Resistant HD**Didisky**$9.98**6,184 rev2mo ago](https://www.amazon.com/dp/B0GRZNDXQD) [![[2 Pack] Galaxy S21 Ultra Privacy Screen Protector 2 Pack Camera Lens Protector Tempered 9H Hardness Easy Install Anti-Scratch Anti-Fingerprint Anti-Spy Screen Protector for Galaxy S21 Ultra 6.8Inch](https://m.media-amazon.com/images/I/41BpeXiFUIL.jpg)**\[2 Pack\] Galaxy S21 Ultra Privacy Screen Protector 2 Pack Camera Lens Protector Tempered 9H Hardness Easy Install Anti-Scratch Anti-Fingerprint Anti-Spy Screen Protector for Galaxy S21 Ultra 6.8Inch**AYCFING**$12.37**8 rev2mo ago](https://www.amazon.com/dp/B0GWLHP8CS) [![[2+2 Pack] Galaxy S21 Ultra Screen Protector and Camera Lens Protector 9H Hardness HD Clear Full Coverage Case Friendly Easy Installation Bubble Free For Samsung Galaxy S21 Ultra -6.8 Inch](https://m.media-amazon.com/images/I/41aMTgBz7GL.jpg)**\[2+2 Pack\] Galaxy S21 Ultra Screen Protector and Camera Lens Protector 9H Hardness HD Clear Full Coverage Case Friendly Easy Installation Bubble Free For Samsung Galaxy S21 Ultra -6.8 Inch**SURF CUZ**$11.88**8 rev3mo ago](https://www.amazon.com/dp/B0GWCX7SDT) [**Didisky 2-Pack Tempered Glass Screen Protector for Samsung Galaxy S21 Ultra Supports Ultrasonic Fingerprint with Easy Installation Frame 3D Curved Full Coverage 9H Hardness Case Friendly HD Clear**Didisky**$25.92**3,457 rev3mo ago](https://www.amazon.com/dp/B0GLP6N6H9) [**Didisky 3+2 Pack Screen Protector for Samsung Galaxy S21 Ultra Tempered Glass and Camera Lens Protector HD 3D Curved Full Coverage Easy to Use Bubble Free 9H Scratch-Resistant**Didisky**$9.87**10 rev3mo ago](https://www.amazon.com/dp/B0GQ2Q1WV6)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[![[2+2 Pack] Galaxy S21 Ultra Screen Protector and Camera Lens Protector 9H Hardness HD Clear Full Coverage Case Friendly Easy Installation Bubble Free For Samsung Galaxy S21 Ultra -6.8 Inch](https://m.media-amazon.com/images/I/41aMTgBz7GL.jpg)**\[2+2 Pack\] Galaxy S21 Ultra Screen Protector and Camera Lens Protector 9H Hardness HD Clear Full Coverage Case Friendly Easy Installation Bubble Free For Samsung Galaxy S21 Ultra -6.8 Inch**SURF CUZ**$11.88**2.6★**▲ 213%**](https://www.amazon.com/dp/B0GWCX7SDT) [**MoShieldwish 3 Pack for Samsung Galaxy S21 Ultra Screen Protector 9H Tempered Glass Full Coverage Case Friendly HD Clear Anti-Scratch Fingerprint Compatible Bubble-Free for S21 Ultra 5G 6.8**MoShieldwish**$9.97**4.4★**▲ 212%**](https://www.amazon.com/dp/B0GF7ZGCVN) [![[2 Pack] Galaxy S21 Ultra Privacy Screen Protector 2 Pack Camera Lens Protector Tempered 9H Hardness Easy Install Anti-Scratch Anti-Fingerprint Anti-Spy Screen Protector for Galaxy S21 Ultra 6.8Inch](https://m.media-amazon.com/images/I/41BpeXiFUIL.jpg)**\[2 Pack\] Galaxy S21 Ultra Privacy Screen Protector 2 Pack Camera Lens Protector Tempered 9H Hardness Easy Install Anti-Scratch Anti-Fingerprint Anti-Spy Screen Protector for Galaxy S21 Ultra 6.8Inch**AYCFING**$12.37**3.2★**▲ 211%**](https://www.amazon.com/dp/B0GWLHP8CS) [**Didisky 3+2 Pack Screen Protector for Samsung Galaxy S21 Ultra Tempered Glass and Camera Lens Protector HD 3D Curved Full Coverage Easy to Use Bubble Free 9H Scratch-Resistant**Didisky**$9.87**2.6★**▲ 210%**](https://www.amazon.com/dp/B0GQ2Q1WV6) [**WILLONE 2+2 Pack for Samsung Galaxy S21 Ultra 5G Screen Protector (6.80 inches) with Camera Lens Protector Case Friendly Tempered Glass Film Fingerprint Unlock HD Clear**WILLONE**$10.04**4.6★**▲ 210%**](https://www.amazon.com/dp/B0GTTSR51Q)
**~~View all trending →~~**
## **What buyers say about s21 ultra screen protector**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Assembly/Installation**18%
*“Easy to put on”*
**Drop/Impact Protection**15%
*“PROTECTED MY PHONE”*
**Ease Of Use**11%
*“easy to use”*
**Quality-Overall**9%
*“Good quality and good fitment easy to clean and no issues with touch”*
**Size-Overall**6%
*“Fits perfectly”*
**Value For Money**5%
*“Decent for price”*
**Efficiency**5%
*“Works great”*
**Advertised Vs Actual Product**4%
*“Just as described”*
**Durability**2%
*“Durable”*
**Display-Overall**2%
*“HOWEVER THIS SCREEN SAVER IS THE EASIEST/SEEMLESS I HAVE EVER USED”*
### **What buyers complain about **
**Quality-Overall**16%
*“Not thrilled with the quality since it cracked on install”*
**Adhesion/Stickiness**10%
*“Didnt stick”*
**Functionality-Overall**9%
*“Does not work as expected”*
**Touch/Button Controls**8%
*“Touchscreen would not work”*
**Durability**6%
*“Easily breakable”*
**Assembly/Installation**5%
*“Installation is complicated”*
**Ease Of Use**5%
*“Didn't go on easy”*
**Value For Money**4%
*“This was a waste of money”*
**Thickness**3%
*“These protectors are THICK”*
**Strength**3%
*“is so flimsy”*
### **Top return reasons **
**Size-Overall**26%
**Functionality-Overall**16%
**Adhesion/Stickiness**10%
**Compatibility-Overall**10%
**Advertised Vs Actual Product**7%
**Touch Screen**4%
**Defective Material/Parts**4%
**Quality-Overall**3%
**Display-Overall**2%
**Value For Money**2%
## **Common questions**
- **Is s21 ultra screen protector profitable to sell on Amazon United States?**
- The niche generates $338K/yr across 20 tracked products. 1 of 8 products launched in the last 360 days are still selling. 90-day search growth is -7.0%. Flapen's verdict: Worth a look (56/100).
- **How competitive is the s21 ultra screen protector niche?**
- 18 brands and 24 sellers compete. The top 5 products take 63% of clicks and top 5 brands hold 63% of demand.
- **What do buyers complain about in s21 ultra screen protector?**
- Top complaints mined from reviews: Quality-Overall, Adhesion/Stickiness, Functionality-Overall. The return rate is 2.0%.
- **When does demand for s21 ultra screen protector peak?**
- Demand peaks in Jul–Aug; the busiest month runs 1.9× the quietest.
- **What does it cost to enter the s21 ultra screen protector niche?**
- Listings span $7.12–$25.92; the average listing price is $11.02 (sweet spot $15–$100). The average incumbent carries 8,890 reviews — the moat a new listing must climb.
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