SigmaOS
The browser as a to-do list.
A Mac-only WebKit browser that treats tabs as tasks in workspaces — mark pages done, snooze them, fly through everything by keyboard. For people whose browser is their job.
- Engine
- WebKit
- License
- Proprietary
- Runs on
- macOS
- Top marks
- Fresh design
- Updated
- September 2026
Why it shines
- Tabs as actionable to-dos
- Fast keyboard-first workflow
- WebKit: light on Mac batteries
Worth knowing
- Mac only
- Subscription for advanced features
- Niche — smaller community
Origins
SigmaOS belongs to The KHTML dynasty — descended from WebKit.
Does well
Ranked in
Scorecard
- Tracking protection0/3
- Fingerprinting resistance0/3
- Anonymity0/3
- Built-in ad blocking0/3
- Customization0/3
- Keyboard control2/3
- Built-in tools2/3
- Minimal interface1/3
- Fresh design3/3
- Classic interface0/3
- Light on resources0/3
- Raw speed0/3
- Battery efficiency2/3
- Extension ecosystem1/3
- Cross-device sync1/3
- Site compatibility2/3
- Low maintenance1/3
- Open source0/3
- Independence0/3
- Built-in AI1/3
- Gaming features0/3
- Dev tooling0/3
0–3 on each of the 22 criteria the quiz and the guides rank by. How we score.
