Tor Browser vs Vivaldi

Tor Browser routes its own web traffic through the Tor network to help hide a user's real IP address and resist tracking, surveillance, and censorship. Based on Mozilla Firefox ESR, it adds measures such as letterboxing, user-agent spoofing, and first-party isolation to make browser fingerprinting harder. Connections to different websites use different Tor circuits, while connections to the same website address use the same circuit. HTTPS-Only Mode upgrades connections to HTTPS where possible. Standard, Safer, and Safest security levels restrict browser features to varying degrees, which can cause some pages to work improperly. The browser can access onion services, and users in censored regions can configure bridges during setup. It is free, open-source software for Android, Linux, macOS, and Windows. Only Tor Browser traffic goes through Tor; other applications on the device are not automatically protected. The Tor Project recommends verifying download signatures and strongly discourages extra browser add-ons because they can affect privacy, security, or functionality.

Vivaldi is a free Chromium-based web browser for Android, iOS, Linux, macOS, and Windows. It combines tab organization with built-in browsing and productivity tools. Users can group tabs in two-level Tab Stacks, arrange them into Workspaces, or view pages side by side with Tab Tiling. Included tools are Mail, Calendar, a Feed Reader, Notes, Sync, and webpage translation. Vivaldi supports Chrome extensions, including in its Android browser. Privacy features include ad and tracker blocking, cookie-warning hiding, and private windows; the maker says Sync uses end-to-end encryption for synced browsing data. Its privacy policy says each installation sends a daily HTTPS message to Vivaldi’s Iceland servers with an installation ID, version, CPU architecture, screen resolution, and time since the previous message. Vivaldi says its Security Group reviews code and new technologies, handles vulnerability reports, and prepares fixes. The company is based in Oslo, Norway, and was founded in 2014.