Sleipnir

Customizable Japanese browser from Fenrir, first on Trident and then Blink. Still updated on Windows, Android and iOS; only the Mac version is on hold.

Facts

Developer

Fenrir Inc.

Website

www.fenrir-inc.com

Engines

TridentWebKit (iOS)Blink

Platforms

WindowsmacOSAndroidiOS

Details

Mac version on hold

Popularity

58/100 — 1M+ Play installs (Android)

Key versions

1. Feb. 20, 2002
   1.00 beta 1TridentFirst beta of Yasuyuki Kashiwagi’s tabbed browser, built on the Internet Explorer component.[1]
2. Apr. 2002
   1.xFirst stable release of Sleipnir.[1]
3. Oct. 12, 2005
   2.00Trident, GeckoFull rewrite by Fenrir after the source code theft: Trident and Gecko, features as plug-ins.[1]
4. Dec. 2010
   Mobile (iOS)WebKit (iOS)Sleipnir Mobile is released on iOS, ahead of other mobile platforms.[1]
5. Sept. 15, 2011
   Mobile (Android)Stable release of Sleipnir Mobile for Android.[1]
6. Nov. 16, 2011
   3 for WindowsTrident, GeckoNew interface with tab groups, three years after its announcement.[1]
7. Nov. 2011
   3 for MacFirst version for Mac.[1]
8. Mar. 26, 2013
   4 for WindowsStart-up up to 50% faster than the previous version.[1]
9. July 10, 2013
   4.3.0.4000BlinkThe rendering engine switches from WebKit to Blink.[1]
10. Nov. 21, 2013
    5 for WindowsBrowser redesigned from scratch, with page thumbnails and an improved search field.[1]
11. May 29, 2014
    6 for WindowsAdds favorite tabs (FavTab) and lowers tab memory use.[1]
12. May 12, 2019
    Android TVStable release for Android TV.[1]
13. Apr. 18, 2023
    6.5.0Blink updated (Chrome 112); Windows versions before Windows 10 are no longer supported.[2]
14. Oct. 15, 2025
    Mobile 5 (iOS)Major overhaul on iPhone/iPad, heavily criticized for missing features.[1]
15. Sept. 3, 2026
    6.5.16Recent Windows release, Blink updated (Chrome 152).[2]

Version sources: [1] Sleipnir (Wikipedia ja), [2] fenrir-inc.com

Sources

1. https://www.fenrir-inc.com/jp/sleipnir/note.html
2. https://en.wikipedia.org/wiki/Sleipnir_(web_browser)
3. https://ja.wikipedia.org/wiki/Sleipnir