Sleipnir Mobile - Web Browser app icon

Sleipnir Mobile - Web Browser

The one step browser that once you try you can't let go of, made in Japan!

Fenrir Inc. · jp.co.fenrir.android.sleipnir

3.0 out of 5 (2 ratings) 1M+ downloads v3.8.5 Update 1 6 MB Android 4.0.3+ PEGI 3 · Everyone

  • Signature matches the Google Play version Details

At a glance

Latest version
v3.8.5 Update 1 (3080581)
Updated
Mar 23, 2026 (7 months ago)
APK size
6 MB
Requires
Android 4.0.3+ (API 15)
CPU support
x86 32-bit, x86 64-bit, ARM (legacy), ARM 32-bit, ARM 64-bit, MIPS, MIPS 64-bit
Category
Communication (app)
Listed since
May 9, 2021 (at least)
Permissions
12 (6 sensitive)
Website
fenrir-inc.com
Developer contact
[email protected]

About this APK

Sleipnir Mobile - Web Browser is an app by Fenrir Inc. in the Communication category, listed since at least May 2021. It includes native code for x86 32-bit, x86 64-bit, ARM (legacy), ARM 32-bit, ARM 64-bit, MIPS and MIPS 64-bit, so it runs on practically every phone.

It asks for 12 permissions, 6 of them sensitive, including precise location, camera and record audio. It asks for the same permissions as version 3.8.4.

What's new in v3.8.5 Update 1

Version 3.8.5 Update 1: ・Fixed an issue where previously configured page display mode settings disappeared from the management screen ・Added the “Open HTTP(S) links in supported apps” option (Settings > Page content) (Android 12 or later) ・Added support for parental settings required in certain regions.

Description

From the listing uploaded by “appupdater”.

The one step browser that once you try you can't let go of, made in Japan! 【3 advantages】 ★ Gestures adjusted by the millimeter for speed and precision ★ Tabs with lightning fast "Open" "Close" "Switch" ★ Customization to cut your daily browsing into a third 【Characteristic functions】 ・ Gestures Tab switching, refreshing, displaying bookmarks, full-screen, all in 1 step.   ・ Hold And Go Open pages one after another by holding down on links. ・ Custom button / Custom panel In the freely customizable User Interface, you can arrange your desired functions, settings, bookmarks(bookmarklets too) where you can find it in just 1 step. ・ Autofill forms (※ From top bar long press menu) ・ Offline viewing Open tab content is automatically stored so that even after you close the app you can instantly restore data. (※ Disabled by default) ・ Automatically unloading old tabs Save memory and stable tabs by limiting tab loading ・ Scroll grip Quickly scroll down to the area of the page you want to view by touching the scroll bar. ・ Tab flicking Flick tabs downwards to close, up to manage groups, and up and then right to open. ・ View mode When opening specified pages and sites, you can have them automatically switch user agent and open in another app. (※ From top bar long press menu) ・ Extensions Layout of pages can be changed, and special functions can be added using extensions. Download from the Extensions Gallery ( http://extensions.fenrir-inc.com/ ). Installing extensions can be completed by simply tapping the install button. ・ Fenrir Pass This is a free cloud service that can be used to automatically sync bookmarks with Sleipnir on Windows, Mac, iPhone and Windows Phone, and also use a number of Web services. Supported services: Twitter / Facebook / Google+ / LinkedIn / Tumblr / Flickr / Readability / Instapaper / Pocket / Dropbox / Evernote / SkyDrive / Google Reader 【Other functions】 ・ Ad-block ・ Optimized design for smartphone and tablet devices ・ Customize the UI to what you like ・ Protect tabs by double tapping ・ tab groups to manage tabs ・ Various site search engines are available ・ "Usual Sites" for quickly accessing your favorite sites ・ Download and manage files ・ Full-screen mode ・ Sort bookmarks ・ bookmarks editing mode ・ Manage FenrirFS bookmarks with labels ・ Backup tabs, bookmarks, settings ・ Close application by holding down back key ・ Open with other browser (※ From top bar long press menu) ・ Search in pages (※ From top bar long press menu) ・ Copy title, URL (※ From top bar long press menu) ・ Open one level above URL (※ From top bar long press menu) 【About Sleipnir Mobile】 Sleipnir Mobile for Android is the one step browser that once you try you can't let go of, made in Japan! It features gestures adjusted by the millimeter for speed and precision, tabs with lightning fast "Open" "Close" "Switch", and customization to cut your daily browsing into a third. You can use it on your smartphone or tablet device. ・ Product page: http://www.fenrir-inc.com/android/apps/sleipnir-mobile.html (Kindle Fire HD version from here)

Version history

3 versions are listed, going back to v3.8.3 Update 1.

All 3 versions

Security & authenticity

Security rating: Trusted

Signing certificate

  • Signature matches the Google Play version Checked by the source store on Mar 23, 2026.
  • Certificate issued to “Fenrir Inc.” This is the certificate of the Google Play version.
  • Same certificate as the 2 other versions checked

Store checks and file details

  • Developer signature not checked yet Mar 23, 2026
  • Validated against Google Play Mar 23, 2026
  • Signed byCN=Yasuyuki Kashiwagi, OU=Fenrir Inc., O=Fenrir Inc., L=Osaka, ST=Osaka, C=jp
  • Signing certificate (SHA-1)57:58:DB:4D:CB:62:EE:BF:75:CE:BB:FE:B6:A8:E5:DF:C6:D1:69:83
  • File MD54f9c519b5086c7382e67af9aa93002d7
  • Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (12)

Sleipnir Mobile - Web Browser requests 12 permissions, 6 of them sensitive.

Required hardware & features

Sleipnir Mobile - Web Browser APK: questions and answers

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the Sleipnir Mobile - Web Browser APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is 4f9c519b5086c7382e67af9aa93002d7.

Tags

More Communication apps