---
title: "diary with lock — $431K/yr Amazon United States Niche, Score 59/100 - Flapen"
canonical_url: "https://flapen.com/research/us/office-products/diary-with-lock"
last_updated: "2026-07-20T18:42:17.858Z"
locale: en
meta:
description: "diary with lock shows no brand lock-in (top 5 brands take 42% of clicks), but a failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "diary with lock shows no brand lock-in (top 5 brands take 42% of clicks), but a failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "diary with lock — $431K/yr Amazon United States Niche, Score 59/100 - Flapen"
---
# **diary with lock**
**Worth a look**
Shows no brand lock-in (top 5 brands take 42% of clicks), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 57Growth 18Conversion 22Competition 91Returns 92Price range 87Avg price 79Brand share 93Review moat 62Quality gap 24
**Brand share**
**Great****42%**
top-5 brand share — no brand owns this niche
**Returns**
**Great****1.1%**
return rate — above 6% kills the launch gate
**Competition**
**Great****24%**
top-5 click share — an open shelf
**Price range**
**Great****$6.70–$92.06**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Great****$16.57**
avg listing price — sweet spot $15–$100
**Review moat**
**Good****1,002.31**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Good****$431K**
$431K/yr · 1.4M searches
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Bad****1.8%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Bad****-14.3%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, diary with lock is a $431K/yr Amazon United States market (1.4M searches/yr). The top 5 brands hold 42% of demand. Demand peaks in Nov–Dec. Verdict: Worth a look — 59/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **Market data**
- **Units sold / yr**
- **40K–50K**
- avg 250–500/product
- **Revenue / yr**
- **$663K–$829K**
- units × avg price
- **Launch success**
- **—**
- 1 of 3 new (360d)
- **Conversion rate**
- **1.8%**
- **Avg BSR**
- **#208**
- **Page quality**
- **0%**
- **Prime**
- **99%**
- **Sponsored**
- **96%**
- **Out of stock**
- **1.5%**
- **Avg brand age**
- **39 months**
- **Avg seller age**
- **167 days**
## **Competition**
Clicks spread well past the top 5 (24% combined) — an open shelf where new products get seen.
**Brands**
**49 **▲rising
**Sellers**
**59**
**Top-5 brand share**
**42%**
Top 20: 81%
**Top-5 click share**
**24%**
Top 20: 57%
**Open market**
**53%**
- WEMATE15% - CAGIE8% - ZXHQ7% - ZICOTO6% - Hoci Poci6% - GINMLYDA5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -14.3% search growth over the last 90 days.
60K40KHoliday '24Black Friday '25 seasonSepDecMarJunAugNovMarMay
Peak months: Nov, Dec · busiest ÷ quietest = 2.3×
[**Open Trend **](https://flapen.com/research/us/office-products/diary-with-lock/trend)
## **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%2%$9K4%$17K6%$26K8%$34K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 94 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**ZXHQ Lock Journal with Pen A5 240 Pages Diary with Lock Brown Edge Refillable Leather Hardcover (8.5 5.9inch) Dark Green**ZXHQ**$14.85**4.5★1,827 rev](https://www.amazon.com/dp/B0BR73LWDD) [2**CAGIE Diary with Lock for Girls and Women A5 Journal with Lock for 8 10 11 12 14 16 Year Old Girls Gifts Presents 192 Pages Waterproof Journal for Girls Ages 8-12 with Pen Marble Diary Purple**CAGIE**$14.19**4.6★1,938 rev](https://www.amazon.com/dp/B09XQ513CP) [3**WEMATE Diary with Lock A5 PU Leather Journal with Lock 240 Pages Vintage Locks Journal Password Notebook with Pen Locks Diary Planner Organizer for Men and Women 8.6x5.8in Black**WEMATE**$15.52**4.5★2,429 rev](https://www.amazon.com/dp/B09QWL9CNL) [4**WEMATE Journal with Lock Diary with Lock Password Notebook Pen & Gift Box - Perfect for Men and Women - 4.3X 6.18in Black Keep Your Secrets Safe**WEMATE**$10.67**4.4★903 rev](https://www.amazon.com/dp/B0BBPMWDCP) [5**Hoci Poci Diary with Lock and Keys for Girls Gift Ideas 360 Gold Edged Pages Journal for Women B6 Refillable Notebook for Writing with Pen and Bookmark (Garden Pink)**Hoci Poci**$19.10**4.8★1,892 rev](https://www.amazon.com/dp/B09QX2S8FZ)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Kiadneii Diary with Lock for Girls Cute Journal with Lock and Key 8PCS Diary Gift Set Birthday Gift Idea for Teen Girls Secret Lockable Diary Ideal Gifts for 8 9 10 11 12 13 14 Year Old Girls**Kiadneii**$21.76**11 rev5mo ago](https://www.amazon.com/dp/B0GH8CKJ33) [**Yonavita Purple Glitter Diary with Lock & Key No-Shed Sparkle Secret Journal Birthday Gift for Girls Ages 6-12 A5 Lined Notebook 8.4x5.7 with Pen Refill Bracelet & Gift Box**Yonavita**$22.10**39 rev8mo ago](https://www.amazon.com/dp/B0G1HXD8FZ) [**Mzj.Office DIY Journal Kit for Girls Ages 8-12 200+PCS Teen Tween Girl Gifts Trendy Stuff Party Favors for Kids 8-12 Birthday Gift for Girls.**Mzj.Office**$19.71**29 rev8mo ago](https://www.amazon.com/dp/B0FXWH34YQ) [**Blue Sky Good Vibes Notebook 160 Lined And Perforated Pages 5.75 x 8.5 Gold Durable Twin Wire Binding Flexible Glitter Shaker Cover Party Dots Pink**Blue Sky**$7.91**28 rev1y ago](https://www.amazon.com/dp/B0FGBJTJYZ) [**Lock Diary for Women Diary with Lock for Girls A5 Leather Locked Journal 260 Pages 100 GSM Refillable Journal with Lock for Teens Secrets Flower Journals with Combination Passwords 5.7x8.3 Green**Ovesmusl**$16.63**179 rev1y ago](https://www.amazon.com/dp/B0FG2SBSBG)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Mzj.Office DIY Journal Kit for Girls Ages 8-12 200+PCS Teen Tween Girl Gifts Trendy Stuff Party Favors for Kids 8-12 Birthday Gift for Girls.**Mzj.Office**$19.71**4.5★**▲ 525%**](https://www.amazon.com/dp/B0FXWH34YQ) [**Kiadneii Diary with Lock for Girls Cute Journal with Lock and Key 8PCS Diary Gift Set Birthday Gift Idea for Teen Girls Secret Lockable Diary Ideal Gifts for 8 9 10 11 12 13 14 Year Old Girls**Kiadneii**$21.76**5.0★**▲ 480%**](https://www.amazon.com/dp/B0GH8CKJ33) [**CAGIE Journal with Lock Gifts for Women Men Retired Colleagues to Record Life Travel Plans 7.5 x 10 Inch 220 Pages Lock Diary with Pen Gift Box**CAGIE**$45.37**4.5★**▲ 450%**](https://www.amazon.com/dp/B0BN1YKKVN) [**LockNote A5 Business Notebook with Lock Leather Portfolio Organizer Fingerprint Security Wireless Charging 8000mAh Power Bank Binder with Zipper Card Holder Journal & Gift Box Red/Black**LockNote**$92.06**4.6★**▲ 420%**](https://www.amazon.com/dp/B0F9VTFS1S) [**WEMATE Journal with Lock A6 PU Leather Diary with Lock 240 Pages Locked Journal Password Notebook with Pen & Gift Box Locking Diary Planner Organizer for Men and Women 4.3X 6.18in Blue**WEMATE**$11.49**4.4★**▲ 420%**](https://www.amazon.com/dp/B0C2P4BDW7)
**~~View all trending →~~**
## **Reviews**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**18%
*“The variety is impressive”*
**Gifting Purpose**16%
*“Given as a gift”*
**Value For Money**7%
*“Great Deal”*
**Locking Mechanism**6%
*“Lock mechanism seems sturdy”*
**Fun/Entertainment Experience**6%
*“Fun for kids”*
**Color**6%
*“Blue color is gorgeous”*
**Advertised Vs Actual Product**5%
*“Just as advertised”*
**Design-Overall**4%
*“The design is cute”*
**Paper Quality**3%
*“Paper looks durable for markers or pens”*
**Size-Overall**3%
*“Size perfect for a kid”*
### **What buyers complain about **
**Locking Mechanism**19%
*“The lock sucks”*
**Quality-Overall**9%
*“Cheap Low Quality”*
**Size-Overall**8%
*“barely fits through”*
**Instructions/User Manual/Troubleshooting**7%
*“Good Product Bad Instructions”*
**Durability**5%
*“Broke quickly”*
**Value For Money**5%
*“I do think it's a bit overpriced for what you get”*
**Functionality-Overall**4%
*“it never worked”*
**Ease Of Use**4%
*“it was difficult to close it”*
**Color**3%
*“Color is off”*
**Writing Experience**3%
*“For example: If you have a bad day you might not be able to write about all of it cause the pages are short”*
### **Top return reasons **
**Size-Overall**23%
**Locking Mechanism**20%
**Value For Money**10%
**Functionality-Overall**9%
**Advertised Vs Actual Product**7%
**Quality-Overall**7%
**Color**6%
**Gifting Purpose**5%
**Defective Material/Parts**2%
**Mechanism Issues**1%
## **Common questions**
- **Is diary with lock profitable to sell on Amazon United States?**
- The niche generates $431K/yr across 94 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is -14.3%. Flapen's verdict: Worth a look (59/100).
- **How competitive is the diary with lock niche?**
- 49 brands and 59 sellers compete. The top 5 products take 24% of clicks and top 5 brands hold 42% of demand.
- **What do buyers complain about in diary with lock?**
- Top complaints mined from reviews: Locking Mechanism, Quality-Overall, Size-Overall. The return rate is 1.1%.
- **When does demand for diary with lock peak?**
- Demand peaks in Nov–Dec; the busiest month runs 2.3× the quietest.
- **What does it cost to enter the diary with lock niche?**
- Listings span $6.70–$92.06; the average listing price is $16.57 (sweet spot $15–$100). The average incumbent carries 1,002 reviews — the moat a new listing must climb.
## **Related niches in Office Products**
- 59 [**book lovers gifts**](https://flapen.com/research/us/office-products/book-lovers-gifts)$986K/yr-24.1%**Worth a look**- 59 [**book accessories**](https://flapen.com/research/us/office-products/book-accessories)$986K/yr-24.1%**Worth a look**- 60 [**teacher bookmark**](https://flapen.com/research/us/office-products/teacher-bookmark)$6K/yr+467.2%**Worth a look**- 60 [**bulk binders**](https://flapen.com/research/us/office-products/bulk-binders)$305K/yr+35.4%**Worth a look**- 60 [**transparent dried flower bookmarks**](https://flapen.com/research/us/office-products/transparent-dried-flower-bookmarks)$31K/yr+35.0%**Worth a look**- 60 [**magazine bag**](https://flapen.com/research/us/office-products/magazine-bag)$218K/yr+8.0%**Worth a look**[**All Office Products niches **](https://flapen.com/research/us/office-products)