Sidekick has shut down. Its old website now sends visitors to Perplexity’s Comet, and Sidekick’s company page says it was acquired by Perplexity.sidekick
There is no exact replacement because Sidekick did several different jobs. If you miss the app sidebar and keeping several accounts signed in, begin with Wavebox. If you miss Sessions and deep customization, try Vivaldi. If you want an AI browser from the company Sidekick joined, look at Comet.
If you came to Sidekick because ordinary browsers make unfinished work hard to return to, Horse takes a different approach. It does not block the interesting parts of the internet. It keeps the route through your task visible, so an interruption does not make you reconstruct the whole thing from memory.
Sidekick Browser alternatives at a glance
| Browser | Begin here if you miss | What it does instead | Check before moving |
|---|---|---|---|
| Wavebox | Sidekick’s app sidebar and multiple accounts | Keeps web apps in a sidebar and separates account cookies in Spaces | Its organizing model still revolves around apps and tabs |
| Vivaldi | Sessions, workspaces, and complete control | Combines Workspaces, Tab Stacks, Saved Sessions, and split views | Its flexibility asks for more setup |
| Comet | The browser Sidekick’s old website leads to | Puts Perplexity’s assistant, search, and automation in the browser | AI is the central idea, not Sidekick’s old interface |
| Horse | Returning to unfinished work without getting lost | Replaces tabs with Trails that preserve how every page led to the next | It is not an app dock or a distraction blocker |
We make Horse, so you know who is speaking. Nothing on this page is a paid placement or affiliate link.
Wavebox
Start with Wavebox if Sidekick was where Gmail, Slack, Notion, and several versions of your working life lived together.
Wavebox puts web apps in its sidebar, keeps multiple accounts signed in, and uses Spaces to separate their cookies. Groups bring apps and tabs together, while split screen and Chrome extensions make it a close practical match for Sidekick’s work-browser job.wavebox
That makes Wavebox the strongest first test for Sidekick’s app-centric navigation. It still organizes the day around apps, accounts, groups, and tabs. If that was the arrangement you loved, this is not a compromise disguised as a recommendation. Begin here.
Vivaldi
Vivaldi suits the person who used Sidekick’s Sessions to set a piece of work aside and wanted the rest of the browser to obey them too.
Its Workspaces separate groups of tabs. Tab Stacks add another level, Saved Sessions reopen a chosen set later, and Tab Tiling puts several pages on screen together. The sidebar can also show a tree-style view of open tabs.vivaldi
Vivaldi gives you more ways to arrange a browser than Sidekick did. The price of that freedom is an afternoon in Settings, which some people will regard as a warning and others as an absolutely tremendous Saturday.
Comet
Sidekick’s website now leads to Comet, but Comet is not Sidekick with a new coat of paint.
Comet is a Chromium browser built around Perplexity’s assistant. It can summarize pages, work across open tabs, search browsing activity, use Chrome extensions, and perform supervised actions on websites.comet
Choose Comet if you want the next browser from the company Sidekick joined and the AI work is what interests you. Do not choose it expecting Sidekick’s old app sidebar or Sessions to reappear under another name.
Horse
Sidekick tried to protect your attention by removing temptations: Focus Mode, blocked distractions, silenced notifications, a task manager, and Pomodoro timers.sidekick-focus Those tools can help when the problem is staying inside one task.
Horse is built for a different moment. You followed a useful link, then another, somebody needed you, and now the task is a row of icons that no longer explains itself.
Horse replaces tabs with Trails®. Open a link and the new page appears directly beneath the page that led you there. Keep going and the route grows down the sidebar, with as much nested depth as the work needs. Collapse what can wait, return tomorrow, and every page is still where it belongs.
Sidekick reduced the places your attention could go. Horse makes it easier to find your way back from wherever it went. Neither asks you to become a more obedient person before the browser will help.
Horse runs on macOS, Windows, and Linux. It currently supports seven tested extensions, not the whole Chrome Web Store. It does not have Sidekick’s multi-account app dock, built-in Pomodoro timer, or website blocker.
Keep the job, not the brand
Sidekick bundled many useful ideas into one browser, so begin with the one you noticed every day.
Choose Wavebox for apps and accounts. Choose Vivaldi for Sessions and control. Choose Comet for an AI assistant inside the browser. Choose Horse when the expensive moment is returning to a task and no longer knowing where you were.
If that last one sounds familiar, try Horse free for 14 days. Give it one real task, follow every useful detour, and close the browser without tidying anything. Open Horse tomorrow. If the route is still obvious, you have found the part Sidekick was not built to preserve.
Notes & references
- Sidekick’s former official domain, meetsidekick.com, now redirects to Perplexity’s Comet. Sidekick’s company page identifies the browser as acquired by Perplexity.⤴
- Wavebox documents its app-centric sidebar, multiple signed-in accounts, Focus Mode, split screen, search, and Chrome extensions, plus Spaces, Groups, Profiles, and cookie isolation.⤴
- Vivaldi documents Workspaces and Tab Stacks along with vertical and tree-style tabs, Tab Tiling, hibernation, and Saved Sessions.⤴
- Perplexity documents Comet’s assistant, cross-tab work, automation, activity search, and Chrome extension support.⤴
- Sidekick’s company post describes its Focus Mode, distraction blocker, task manager, Pomodoro timer, ad blocker, and tab suspension.⤴