Side Space
AI vertical sidebar tab manager with agent automation
Side Copilot is a standout choice for tab hoarders who want AI-driven organization without switching browsers. The free tier is genuinely generous, and the Pro plan at $2.9/month yearly is a bargain for unlimited spaces and Agent Mode. Skip it if you're a minimal-tab user or prefer horizontal tabs.
Verified 2d ago · liveness 82/100 · cite: rightaichoice.com/tools/side-space
- Multitab researchers and students
- Productivity enthusiasts
- Remote workers with multiple browsers
- Arc Browser refugees
- Users who prefer horizontal tab strips
- Minimal-tab users
- Safari users
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Skip Side Copilot if you rarely have more than ten tabs open, prefer horizontal tab strips, or need a standalone desktop app or Safari support.
Agent Mode on the free plan is throttled to 2 free trials per day; you must upgrade to Pro for full access.
Pricing fits individual multitab users and freelancers: a generous free plan, Pro at $2.9/month yearly, and Pro+ at $7.9/month yearly. Compared to Arc's free-but-limited model or Dia's subscription, Side Copilot offers more features at a lower price point, especially for power users.
In short
Side Space — AI vertical sidebar tab manager with agent automation. Best for Multitab researchers and students, Productivity enthusiasts, Remote workers with multiple browsers. Free to start; paid plans from $4.92/mo.
What people actually say about Side Space — is it worth it?
We ran a structured research pass across product reviews, community discussions, and post-purchase forum threads to surface the patterns vendors won't publish themselves. Below: the recurring strengths, the hidden costs people mention most, and the cohort that consistently regrets adopting this tool.
60 mentions across 4 sources (Hacker News, Product Hunt, Bluesky, Lemmy) · researched Jul 5, 2026.
- +Arc-like vertical sidebar works within existing browsers without switching.
- +AI grouping organizes tabs by domain or custom rules automatically.
- +Spaces (workspaces) keep work, personal, and research contexts separate.
- +Cross-browser sync across Chrome, Edge, Brave, and Firefox.
- +Drag-and-drop tab management feels intuitive and responsive.
- −Browser compatibility seems inconsistent, with Edge-only reports.
- −No Firefox addon despite community demand.
- −Cloud sync data storage location not transparent to users.
- −AI features lack detailed community feedback on real-world usefulness.
- −Free tier's 5-space cap may feel too restrictive for testing.
- • Pro and Pro+ pricing not publicly listed on available data
- • BYOK requires you to supply your own AI model key which may incur external costs
Viability Score
How well maintained and how widely used is Side Space? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: September 2026
How we score →Key Features
- AI-powered vertical tab sidebar with drag-and-drop
- Chat Mode: summarize and query your open tabs
- Agent Mode: automate browser tasks
- Spaces for work, social, shopping, study—sync across browsers
- Group tabs by AI, domain, or custom patterns
- Pin, suspend, deduplicate, and search tabs
- Save/restore tab groups within spaces
- Copy all URLs in markdown/text/json format
- Move selected tabs/groups to new windows
- Customizable space colors and dark mode
- Multi-language support (EN, ZH, FR, ES, JA)
- BYOK: Bring Your Own Key for AI models
- Chat with PDFs, Word, Excel, PPT, images (Pro+)
- YouTube video summarization (Pro+)
- Reddit post search (Pro+)
About Side Space
Side Copilot is a browser extension that replaces your cluttered horizontal tab bar with an AI-powered vertical sidebar and organizes tabs into themed Spaces—work, social, shopping, study—that sync across Chrome, Edge, Brave, Firefox, and other Chromium browsers. It's built for researchers, students, and professionals juggling dozens of tabs daily, keeping you in the browsers you already use without switching to tab-native alternatives like Arc or Dia. Chat Mode answers questions about your open tabs and summarizes pages. Agent Mode automates browser tasks including grouping, window management, history search, and research. The free tier includes up to five Spaces, cloud sync, and AI chat with the current tab. Pro unlocks unlimited Spaces, agent automation, BYOK, and cloud-synced chat history. Pro+ extends AI to files and media—chat with PDFs, Word, Excel, PPT, images, summarize YouTube videos, search Reddit, and generate mind maps. Multi-language support covers English, Chinese, French, Spanish, and Japanese.
Behind the Verdict
Side Copilot fills a real gap: it brings AI-powered tab management into the browsers you already use, unlike Arc or Dia which demand a full switch. The vertical sidebar is well-executed, and the Spaces concept keeps work and personal tabs separate. The free plan is surprisingly useful—up to five spaces and AI chat with the current page—so you can test it thoroughly. Pro at $2.9/month yearly is a low entry point for agent automation and BYOK. Pro+ adds file chatting and mind maps, useful for researchers. The main weakness: it's a browser extension, so it lacks the deep OS integration of Arc, and AI grouping can be imperfect. If you're a tab minimalist, it's overkill. But for multi-tab researchers and productivity enthusiasts, it's a compelling alternative to native tab managers.
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Real-world workflow fit
Concrete scenarios for the personas Side Space actually fits — and what changes day-one when you adopt it.
Install Side Copilot, create a Space named 'Research' and let Group by AI organize tabs into topics. Use Chat Mode to summarize each group's content and extract key findings, then save the group as a tab group for reference.
Outcome: Tabs organized into topical groups, with AI-generated summaries and a saved session, cutting research time by half.
Upgrade to Pro (yearly) to access Agent Mode. Set up a shortcut template for 'Daily Wrap Up' that groups tabs from the work Space, closes duplicates, and provides a summary in the chat.
Outcome: Daily tab cleanup becomes a one-click automation, freeing 15 minutes each morning.
Create two Spaces: 'Work' and 'Personal'. Keep Work tabs organized by domain, and use Space Switcher to toggle between them. Enable cloud sync to access the same Spaces in Firefox at home.
Outcome: A unified tab workspace across two browsers, no more manually relocating tabs.
Use Cases
- Group all your open research tabs into topic-based spaces automatically with AI.
- Ask Side Copilot to summarize every open tab about a project and extract key dates.
- Sync your tab spaces across work and personal browsers on different devices.
- Use Agent Mode to save and restore a complete research session as a tab group.
- Chat with multiple PDFs and web pages side-by-side in Pro+ for deep research.
- Automate daily browser tasks like grouping tabs and searching history with Agent Mode.
- Use Spaces to keep work, shopping, and personal browsing separate in one window.
- Generate mind maps from open tabs or YouTube videos (Pro+).
Models Under the Hood
as of 2026-08-27
Limitations
- Side Copilot is a browser extension, so it doesn't offer a standalone native app.
- The free plan limits you to 5 spaces and restricts Agent Mode to 2 free trials per day.
- Pro unlocks agent mode, but advanced tools like PDF chatting and mind maps require the Pro+ tier.
- Sync works across Chromium browsers and Firefox, but Safari is not supported.
- The AI grounding is limited to your open tabs unless you upgrade, and BYOK requires your own API keys for custom model access.
- Performance may degrade with a very large number of tabs.
as of 2026-09-01
Verification history
We have re-verified Side Space 8 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-checked, vendor evidence unchanged
- — re-checked, vendor evidence unchanged
- — re-checked, vendor evidence unchanged
- — re-checked, vendor evidence unchanged
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
Showing the 6 most recent of 8 verification passes.
Free to cite with attribution — this page re-verifies continuously.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Side Space tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Free
$0/mo
Ideal for
Tab users with under 5 active projects who want a taste of vertical tabs and AI chat without paying.
What this tier adds
Starting tier: up to 5 spaces, AI chat with current tab only, no agent automation.
Pro
$4.9/mo (or $2.9/mo yearly)
Ideal for
Frequent multitab users who need unlimited spaces and agent automation at a low cost.
What this tier adds
Adds unlimited spaces, Agent Mode (page agent), BYOK, and cloud-synced chat history.
Pro+
$8.9/mo (or $7.9/mo yearly)
Ideal for
Power researchers and advanced users who need file chat, mind maps, and cross-page automation.
What this tier adds
Adds cross-page agent, multi-tab chat, and tools for files, YouTube, Reddit, and mind maps.
Where the pricing makes sense
The company stage and team size where Side Space's pricing actually pencils out — and where peers do it cheaper.
Pricing fits individual multitab users and freelancers: a generous free plan, Pro at $2.9/month yearly, and Pro+ at $7.9/month yearly. Compared to Arc's free-but-limited model or Dia's subscription, Side Copilot offers more features at a lower price point, especially for power users.
Setup time & first value
How long it actually takes to get something useful out of Side Space — broken out by persona, not the marketing-page minute.
You can install the extension and create your first Space in under 5 minutes. The free plan allows immediate testing of Chat Mode with your current tab. To fully benefit from Agent Mode and file tools, upgrade to Pro or Pro+—expect to spend 10-15 minutes exploring the options.
Switching to or from Side Space
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From Arc: Install Side Copilot in Chrome or Edge and recreate your Arc sidebar layout; Spaces replace Arc's vertical tabs with AI organization.
- →From Dia: Side Copilot plugs into existing browsers, so you can keep your bookmarks and accounts while starting with a blank slate of Spaces.
- ↗To Arc: Arc offers native vertical tabs and Spaces, but requires moving all data into its ecosystem.
- ↗To Dia: Dia is a standalone browser with AI chat; you'd need to migrate manually.
Integrations
Resources & Guides
- Tutorialsidecopilot.com
Introducing Side Copilot · Side Space
Step-by-step walkthrough from sidecopilot.com
- Tutorialsidecopilot.com
Introducing The Concept Of Spaces · Side Space
Step-by-step walkthrough from sidecopilot.com
- Tutorialsidecopilot.com
How To Manage Your Spaces · Side Space
Step-by-step walkthrough from sidecopilot.com
- Tutorialsidecopilot.com
How To Change The Location Of Side Panel In Chrome · Side Space
Step-by-step walkthrough from sidecopilot.com
- Tutorialsidecopilot.com
How To Get Vertical Tabs In Chrome · Side Space
Step-by-step walkthrough from sidecopilot.com
- Tutorialsidecopilot.com
Why You Dont Need An Ai Browser · Side Space
Step-by-step walkthrough from sidecopilot.com
- Resourcesidecopilot.com
Home · Side Space
Helpful link from sidecopilot.com
Tutorials & Learning
Official links
Featured Head-to-Head Comparisons
Side Space vs Presto Voice
Side Space and Presto Voice serve entirely different markets. Side Space is a browser extension for individual productivity, while Presto Voice is an enterprise drive-thru voice AI for QSR chains. Choose Side Space if you manage dozens of tabs and need AI organization; choose Presto Voice if you operate a QSR chain aiming to boost revenue via voice automation. They are not direct competitors.
Side Space vs Locus Robotics
Locus Robotics and Side Space serve entirely different markets: Locus is a physical automation solution for large-scale warehouse operations, while Side Space is a browser extension for individual productivity. Choose Locus if you need to 2-3x fulfillment throughput in a high-volume warehouse; choose Side Space if you drown in browser tabs daily. There is no direct competition.
Side Space vs Truleo
Truleo and Side Space serve entirely different worlds: Truleo is a specialized law enforcement intelligence platform that transforms siloed data into case leads, while Side Space is a productivity browser extension for taming tab chaos. Your choice depends on whether you work in policing or just need a better browser workflow. For law enforcement, Truleo is indispensable; for everyday multitab users, Side Space is a free, lightweight solution.
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Best-of guides
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