J2K Browser vs KeyFolder2
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
J2K Browser
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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
Verdict
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 ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
J2K Browser ships an update every 143 months, KeyFolder2 every 15 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | J2K Browser | KeyFolder2 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 143 months | Every 15 months โ better |
| Ads | โ | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod, Apple Watch โ better | iPhone, iPad, iPod |
| Requires iOS | 15.5 | 15.1 โ better |
| Further details โ not scored | ||
| Size | 30 MB | 28 MB |
| Age rating | 17+ | 4+ |
| Developer | leesop.com | Tatsuya Tobioka |
In-app purchases
J2K Browser
No in-app purchases
KeyFolder2
No in-app purchases
Questions
Is J2K Browser free?
Is KeyFolder2 free?
Which is updated more often, J2K Browser or KeyFolder2?
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