Comparison

J2K Browser vs KeyFolder2

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

Keep secret files by passcode

Free

🔧 Utilities

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About

J2K Browser

Read full description

일본 웹 여행에 도움이 되는 웹 브라우저입니다.

About

KeyFolder2

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KeyFolder is a simple file browser app that can be locked with a passcode. KeyFolder1 has been used as a private app for 2 years. KeyFolder2 is its open-source and public version, available for everyone to use at no cost. # Features List - Locking with a PIN code - Organize files into folders - Display multiple files in a slideshow format - Support for iPad multi-window - Import from Photos and Files app - Open-source and Made in Japan * Please note that files are not encrypted. Kindly avoid storing confidential information within the app. Let's protect your secret files with a PIN.

Screenshots

J2K Browser2 screens

KeyFolder24 screens

Verdict

The call

The clearest difference is update cadence: KeyFolder2 at every 15 months against J2K Browser's every 143 months. On price, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

J2K Browser ships an update every 143 months, KeyFolder2 every 15 months. Both last shipped on October 3, 2026.

Scorecard1 real difference · 5 level

J2K Browser versus KeyFolder2: the parameters behind the verdict, then further details
Parameter	J2K Browser	KeyFolder2
Price	Free	Free
Update frequency	Every 143 months	Every 15 months — better
Ads	—	Yes
In-app purchases	No	No
Devices	iPhone, iPad, iPod, Apple Watch — better	iPhone, iPad, iPod
Requires iOS	15.5	15.1 — better
Further details — not scored
Size	30 MB	28 MB
Age rating	17+	4+
Developer	leesop.com	Tatsuya Tobioka

In-app purchases

None

J2K Browser

No in-app purchases

None

KeyFolder2

No in-app purchases

Questions

Is J2K Browser free?

J2K Browser is free to download, with no in-app purchases.

Is KeyFolder2 free?

KeyFolder2 is free to download, with no in-app purchases.

Which is updated more often, J2K Browser or KeyFolder2?

J2K Browser ships an update every 143 months, and KeyFolder2 every 15 months. Most recently, J2K Browser was updated on October 3, 2026 and KeyFolder2 on October 3, 2026.