Otter Browser
What Otter Browser is
Otter Browser is a free, open-source desktop browser for Linux, macOS, and Windows. Built primarily in C++ with Qt and released under GNU GPL v3, it aims to restore useful aspects of the classic Opera 12.x interface. The project focuses on power users who want extensive controls while keeping the browser fast and lightweight. Built-in content blocking supports profiles and custom rules. Keyboard and mouse profiles, bookmark, history, notes, and transfer managers are included. Its Feeds Reader parses Atom and RSS 2.0 feeds with category support, while proxy configurations can be assigned per page or host. The browser uses modular components and an abstraction layer intended to allow replacements for managers such as bookmarks and history. Linux users can install an AppImage or use distribution and BSD repositories; macOS offers DMG downloads, and Windows releases come from SourceForge. Source builds require Qt, OpenSSL, GStreamer with codecs, and CMake. Extension support is none.
Who it suits
Otter Browser suits desktop power users who want a Qt-based, Opera 12.x-inspired interface and built-in controls. It is also relevant to users comfortable with open-source software, source builds, or distribution packages.
What it does well
- Free software under GNU GPL v3
- Built-in content blocking and custom rules
- Feeds Reader supports Atom and RSS 2.0
- Available for Linux, macOS, and Windows
- Modular design and portable mode
What to know first
- No extension support
- Does not aim to reproduce every Opera feature
- Source builds require several dependencies
- Project lists 254 open issues
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Otter Browser | Free software under GNU GPL v3 · no paid plans stated | Free |
As otter-browser.org lists them, read 12 Oct 2026. The maker's own page has the final word.
Verdict
Otter Browser provides an open-source desktop browsing experience centered on classic Opera-style controls and power-user features. Its lack of extension support and stated limits on recreating Opera features are important considerations.
Facts from Otter Browser's own pages
- Audience
- The project says it focuses on powerful features for power users while keeping the browser fast and lightweight. · github.com, 12 Oct 2026
- Browser engine
- other · otter-browser.org, 23 Sept 2026
- Browser features
- The project describes built-in content blocking, keyboard and mouse profiles, and managers for bookmarks, history, notes, and transfers. · otter-browser.org, 12 Oct 2026
- Build
- The browser is written primarily in C++ and uses the Qt framework. · github.com, 12 Oct 2026
- Build dependencies
- Building from source requires Qt 5.15.0 or newer, OpenSSL, GStreamer with codecs, and CMake 3.16.0 or newer. · github.com, 12 Oct 2026
- Build requirements
- Building from source requires Qt 5.15 or newer, OpenSSL 1.0 or newer depending on Qt, GStreamer 1.0 or newer with codecs, and CMake 3.16 or newer. · github.com, 12 Oct 2026
- Built-in ad blocking
- Yes · otter-browser.org, 23 Sept 2026
- Content blocking
- The changelog documents content blocking profiles and the ability to add custom blocking rules. · github.com, 12 Oct 2026
- Feeds
- The changelog says the Feeds Reader includes Atom and RSS 2.0 parsers and category support. · github.com, 12 Oct 2026
- Free plan
- Yes · otter-browser.org, 23 Sept 2026
- Installation
- Users can compile Otter Browser from source or use pre-compiled binaries. · github.com, 12 Oct 2026
- Intended users
- The project describes its primary objective as serving power users who miss Opera after it dropped the Presto engine. · otter-browser.org, 12 Oct 2026
- License
- Otter Browser is released under the GNU GPL v3. · github.com, 12 Oct 2026
- Linux and BSD
- Linux users can use an official AppImage, and the browser is also available in repositories for various Linux distributions and BSD systems. · github.com, 12 Oct 2026
- Linux downloads
- Linux users can download an official AppImage, and the browser is also available in repositories of Linux distributions and BSD systems. · github.com, 12 Oct 2026
- macOS downloads
- The official site lists DMG downloads for macOS. · otter-browser.org, 12 Oct 2026
- Modularity
- The project says the browser is designed to be modular, with an abstraction layer intended to support replacing components such as bookmark and history managers. · otter-browser.org, 12 Oct 2026
- Notable limitation
- The project says that it does not intend to reproduce every Opera feature, citing Unite and widgets as examples it considers infeasible. · otter-browser.org, 12 Oct 2026
- Open source
- Yes · otter-browser.org, 23 Sept 2026
- Supported platforms
- desktop · otter-browser.org, 23 Sept 2026
- Portable mode
- A portable version can be configured by placing an arguments.txt file containing --portable beside the browser executable. · github.com, 12 Oct 2026
- Project activity
- The official site’s 2026-10-05 weekly report lists seven commits by one author, no new issues, and 254 open issues including seven bugs. · otter-browser.org, 12 Oct 2026
- Project status
- The official site’s latest listed weekly report is dated 2026-10-05 and reports 254 open issues, including 7 bugs. · otter-browser.org, 12 Oct 2026
- Proxy settings
- The changelog documents multiple proxy configurations that can be assigned per page or host. · github.com, 12 Oct 2026
Where Otter Browser stands on Freedom251
- Web browsers#28 of 154