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115Browser vs Vivaldi: catalog facts
115Browser	Vivaldi
Free Free to download; no price is listed for the browser.	Free Free, funded by default search engine and bookmark placement deals.
Windows, macOS	Windows, macOS, Linux, Android, iOS
Chromium engine Integrates the 115 cloud storage client	Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel
Interface and site are Chinese only Mainly useful for people with a 115 account	Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.