Side Space
FreemiumAI vertical tab manager with spaces, automation, and cross-browser sync
By Tanmay Verma, Founder · Last verified 06 Jul 2026
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Added 6d ago
77/100Safe BetIn short
Side Space — AI vertical tab manager with spaces, automation, and cross-browser sync. Best for Multitab researchers and students who need AI to organize dozens of open tabs, Productivity enthusiasts who want AI-automated browser tasks, Remote workers switching between work, personal, and hobby contexts. Free to start; paid plans from $2.94/mo.
Is Side Space actually worth it?
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Editorial Verdict
Best for
Multitab researchers and students who need AI to organize dozens of open tabsProductivity enthusiasts who want AI-automated browser tasksRemote workers switching between work, personal, and hobby contextsUsers with multiple browsers who need unified tab syncArc Browser refugees seeking a vertical sidebar in Chrome/Edge
Not ideal for
Users who strongly prefer horizontal tab stripsPeople who rarely have more than 10 tabs openThose seeking a standalone native desktop appUsers who need fully offline tab management
For anyone regularly buried under 20+ tabs, Side Copilot is a lifesaver. The free tier is generous, and the Pro plan at $2.9/mo (yearly) is a steal for unlimited spaces and basic agent automation. Skip it if you prefer horizontal tabs or rarely open more than 10 tabs.
Skip Side Space if Skip Side Copilot if you prefer horizontal tab strips or rarely open more than 10 tabs at a time.
Last verified: July 2026
What independent users actually report about Side Space
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).
63% positive37% critical
Recurring strengths
- +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.
Recurring frustrations
- −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.
Patterns worth knowing
Arc-like experience without switching browsers is a key draw
Seen on Hacker News, Product Hunt
AI grouping and automation praised but untested in depth
Seen on Product Hunt
Browser compatibility issues, especially Firefox missing
Seen on Product Hunt, Hacker News
Learning curve
beginnerProductive in ~5 minutes
Hidden costs people mention
- • 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
77/100
Safe BetHow likely is Side Space to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
momentum
55
funding runway
80
website health
90
wrapper dependency
100
Last calculated: July 2026
How we score →Key Features
- Vertical tab sidebar with drag-and-drop management
- AI-powered tab grouping by category or domain with one click
- Spaces (workspaces) for different contexts
- Chat Mode: AI summary of open tabs
- Agent Mode: automate tab grouping, window management, history search
- Cross-browser sync across Chrome, Edge, Brave, Firefox, Zen, Vivaldi, Sigma, Comet
- Group Guard auto-detect and group tabs by patterns
- Tab pin, suspend, deduplicate, and search
- Save and restore tab groups within spaces
- Copy all tab URLs in markdown/text/json format
- Move selected tabs/groups to new windows
- Customizable space color themes and dark mode
- Multi-language support (English, Chinese, French, Spanish, Japanese)
- Bring Your Own Key (BYOK) for custom AI models
- Pro+ tools: mind map generation, PDF/Excel/Word chatting, YouTube summarization, Reddit post search
About Side Space
FreemiumIntermediateNo APIPlugin
Side Copilot is a browser extension that replaces your cluttered horizontal tab bar with a structured vertical sidebar, supercharged by AI for organization and automation. Designed for professionals, creators, and power users who juggle dozens of tabs, it groups tabs by category or domain, offers dedicated Spaces for different contexts (work, social, shopping), and syncs across Chrome, Edge, Brave, Firefox, and other browsers. The AI copilot works in two modes: Chat Mode answers questions about your open tabs, while Agent Mode can automate browser tasks like grouping tabs, managing windows, or researching topics. Beyond tab management, Pro+ plans unlock tools like mind map generation, PDF/Excel/Word chatting, YouTube video summarization, and Reddit post search. The free tier gives you 5 spaces with basic AI chat on the current tab. Compared to native vertical tab browsers like Arc or Dia, Side Copilot works as an extension in your existing browser—no switching ecosystems required.
Behind the Verdict
Side Copilot stands out among browser extensions by offering a vertical tab manager with AI smarts—Chat Mode and Agent Mode—that actually reduce the cognitive load of multitab browsing. The Spaces feature is well executed: you can separate work, shopping, study, and personal browsing into isolated contexts within the same window, and sync them across multiple browsers (Chrome, Edge, Brave, Firefox, Zen, etc.). The free tier is surprisingly generous: 5 spaces, unlimited AI chat with the current tab, and Group Guard with patterns. Pro ($2.9/mo yearly) unlocks unlimited spaces, Agent Mode for browser automation, BYOK for custom AI models, and unlimited chat history. Pro+ ($7.9/mo yearly) adds cross-page agent, file chatting (PDF, Word, Excel, images), YouTube summarization, and mind map generation. However, there are limitations: the free plan caps AI grouping at 1,000 URLs, and Agent Mode is limited to 2 free trials per day. Privacy-sensitive users should note that AI features require sending tab content to third-party models (though BYOK mitigates this). If you're happy with horizontal tabs or rarely exceed 10 open tabs, this tool offers little value. For Arc refugees who miss vertical tabs but want to stay in Chrome/Edge, Side Copilot is an excellent alternative.
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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.
Multitab researcher
You have 30+ tabs open for a literature review. You ask Side Copilot's AI to group them by topic, creating spaces like 'Machine Learning' and 'Data Privacy'. You then use Chat Mode to ask for a summary of all tabs in the 'Machine Learning' space.
Outcome: Tabs organized into focused spaces, with AI summaries extracting key points, saving hours of manual sorting.
Productivity enthusiast
You use multiple browsers (Chrome at work, Firefox at home). You install Side Copilot on both and log in. Your spaces (e.g., 'Work', 'Shopping') sync automatically, preserving tab groups and pinned tabs.
Outcome: Seamless tab organization across devices and browsers, no more manually recreating setups.
Arc Browser refugee
You miss Arc's vertical tabs and spaces but want to stay in Chrome. You install Side Copilot, enable the vertical sidebar, and recreate your work/personal spaces. Agent Mode helps auto-group new tabs by domain.
Outcome: Arc-like experience inside Chrome with additional AI automation, without switching browsers.
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
OpenAIGeminiGrokPerplexityClaude
as of 2026-07-06
Limitations
- Free plan limits to 5 spaces, AI grouping capped at 1,000 URLs, and Agent Mode limited to 2 free trials per day.
- Pro+ required for cross-page automation and file chatting.
- AI features require sending tab content to third-party AI models, though BYOK provides some control.
- No native Safari support mentioned.
as of 2026-07-06
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Annual total
Free
Over 12 months
Effective monthly
Free
Billed monthly
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
Casual users with fewer than 5 contexts, who need basic AI chat with the current tab and don't require agent automation.
What this tier adds
Starting tier offering up to 5 spaces, unlimited AI chat with current tab, and Group Guard with patterns, but no Agent Mode and capped at 1,000 URLs for AI grouping.
Pro
$2.9/mo (yearly) or $4.9/mo (monthly)
Ideal for
Power users who need unlimited spaces, AI automation (Agent Mode), BYOK for custom AI models, and unlimited chat history, typically researchers or professionals with many tabs.
What this tier adds
Unlocks unlimited spaces, Agent Mode (Page Agent), unlimited shortcuts/templates, unlimited chat history with cloud sync, and BYOK.
Pro+
$7.9/mo (yearly) or $11.9/mo (monthly)
Ideal for
Advanced users who require cross-page agent automation, file chatting (PDF, Word, Excel, images), YouTube summarization, and mind map generation—ideal for deep research workflows.
What this tier adds
Adds Cross-Page Agent, chat with multiple tabs, Reddit post search, mind map generation, YouTube video chatting, and file chatting tools, plus access to beta features.
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.
Side Copilot's pricing is aggressively low for the features offered: $2.9/mo yearly for Pro is cheaper than most tab managers and a fraction of AI browser subscriptions like Dia. The free tier is generous for light users. For heavy multitab researchers, Pro+ at $7.9/mo yearly is competitive with tools like Motion or Akiflow, though those offer calendar integration.
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.
Installation takes under a minute. Creating your first space and grouping tabs by AI takes another minute. For Pro+ users, exploring advanced tools (PDF chat, mind maps) requires no additional setup beyond logging in. Cross-browser sync works immediately after signing up on each browser.
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.
Migrating in
- →From Arc Browser: Install Side Copilot and recreate your spaces manually, or use AI grouping to auto-organize tabs.
- →From built-in Chrome tab groups: No direct import, but you can manually recreate groups or use AI grouping to re-cluster tabs.
- →From Dia Browser: Install Side Copilot and use AI grouping to organize your tabs into spaces.
Migrating out
- ↗To Arc Browser: Export tab URLs via copy feature (markdown/text/json) and manually organize in Arc.
- ↗To another extension (e.g., OneTab): Export all URLs from a space as text and import into OneTab's note format.
- ↗To native vertical browsers (e.g., Dia, Comet): Uninstall Side Copilot; your spaces are saved in cloud but not directly exportable as browser profiles.
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
Blog · Side Space
Helpful link from sidecopilot.com
- Resourcesidecopilot.com
Faqs · Side Space
Helpful link from sidecopilot.com
- Resourcesidecopilot.com
Help · Side Space
Helpful link from sidecopilot.com
Frequently Asked Questions
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