Who this is for
If you have dozens of open tabs right now, your browser is probably eating several gigabytes of memory. You are likely trying to choose between Arc, which treats your web browser like a visual desktop OS, and Zen Browser, a lightweight open-source challenger built on Firefox that brings vertical tabs and workspace profiles without the performance overhead.
This comparison is for tab hoarders who want to clean up their workspace. If browser setup takes longer than the actual work it organizes, it fails the review. We are looking at how these two tools organize tabs, what they cost in system resources, and which one you should actually use today.
At a glance
| Option A: Arc | Option B: Zen Browser | |
|---|---|---|
| Best for | Mac-first visual organization | Keyboard-first, resource-efficient browsing |
| Base engine | Chromium (Blink) | Firefox (Gecko) |
| Price shape | Free (requires account) | Free, open-source (no account needed) |
| Killer feature | Spaces, split view, automatic tab archiving | Native CSS mods, vertical tabs, Firefox privacy |
| Dealbreaker | High RAM usage, closed-source, Mac-centric | Smaller extension store, early beta feel |
Option A: Arc
Arc, built by The Browser Company, is a complete reimagining of the web interface. It hides the traditional top URL bar, replaces it with a collapsible vertical sidebar, and groups tabs into distinct Spaces (such as work, personal, and hobbies) that you can swipe between.
Its strongest feature is the way it manages tab clutter. Instead of letting tabs accumulate until they are unreadable, Arc automatically archives unpinned tabs after a set number of hours. If you want a tab to persist, you pin it to a Folder. It also includes an excellent Split View system that lets you view up to four websites side-by-side in a single window without managing floating OS windows.
The compromise is resource consumption. Arc is built on Chromium, wrapped in custom Swift UI code. If you run it on a base-model laptop, it will consume a massive amount of memory. It also requires you to create an account before you can even search the web, which is a frustrating friction point for a utility tool.
Option B: Zen Browser
Zen Browser is a newer open-source project that takes the vertical-tab organization popularized by Arc and applies it to Firefox. Because it is built on Firefox’s Gecko engine, it does not lock you into the Google-dominated Chromium field.
Zen offers a similar sidebar design: collapsible vertical tabs, spaces, split views, and a clean web canvas. Where Zen shines is performance and customizability. It runs noticeably cooler and uses less RAM than Arc when handling large tab sets. It also supports native CSS modifications, allowing you to tweak the browser interface directly through settings or install community themes from a built-in store.
The tradeoff is the Firefox foundation. The extension store is smaller than Chrome’s, and certain legacy enterprise tools are optimized exclusively for Chromium. Zen is also early in its development lifecycle, meaning you will encounter occasional rendering bugs and UI inconsistencies that you do not see in Arc.
Verdict by scenario
- Choose Arc if you want maximum visual polish and Chromium extensions. If you rely on Chrome-specific extensions, want automatic tab archiving, and have a modern machine with at least 16GB of RAM, Arc is a highly polished, feature-complete dashboard.
- Choose Zen if you want a lightweight canvas and Firefox privacy. If you want vertical tabs and workspace profiles without Google’s Chromium engine running your computer’s fans, Zen is a fast, open-source alternative that respects your system resources.
Bottom line
Arc is a mature visual workspace, but it is resource-heavy and forces you to log in. Zen Browser delivers the same spatial organization on top of a private, lightweight Firefox engine. For most tab hoarders who want an efficient, distraction-free setup, Zen is the better choice today.
