Side Space Alternative: AI Browser Agent vs No-Signup Keyword Search

If you're searching for a Side Space alternative, there's a wrinkle worth knowing before you compare anything: Side Space isn't really called Side Space anymore.

The product rebranded to Side Copilot, and the rebrand isn't cosmetic — it comes with a repositioning. Where Side Space was pitched as a vertical-tab-and-spaces manager with AI grouping, Side Copilot's own site now leads with "Your AI Agent for browser automation." The vertical-tabs-and-spaces feature is still there, but it's no longer the headline — AI chat and agent automation are. Several "best tab manager" roundup posts from earlier in 2026 still describe it under the old name and old pricing, which is now out of date.

Here's what Side Copilot actually offers today, and what a plain, no-AI alternative looks like if the rebrand pushed the product past the job you originally wanted it for.

What Side Copilot actually is (as of this rebrand)

Side Copilot is a Chrome extension (also available for Edge, Brave, Vivaldi, and a few Chromium-based AI browsers) built around a vertical sidebar:

• Spaces — group tabs into named workspaces, same core idea as the original Side Space.
• Cloud sync — available even on the free tier, across up to 5 spaces.
• AI Chat with the current page — unlimited on the free tier, lets you ask questions about whatever tab is open.
• AI Agent Mode — paid-only; automates multi-step actions in the browser rather than just answering questions.
• Cross-Page Agent (Pro+ only) — extends agent actions across multiple open tabs/pages at once.
• "Group Tabs by AI" using custom categories.
• Pricing: free tier gets 5 spaces with cloud sync and unlimited page-chat, but no Agent Mode. Pro is $2.90/month billed yearly (or $4.90/month billed monthly) and unlocks Agent Mode. Pro+ is $7.90/month billed yearly (or $11.90/month billed monthly) and adds the Cross-Page Agent. There's a 7-day money-back guarantee; no lifetime one-time plan is currently offered.

Where that's a real shift, not just a name change:

• The free tier no longer covers everything a simple tab-saving user needs long-term — 5 spaces is a cap, and the interesting new capability (Agent Mode) is gated behind a recurring subscription.
• You're now paying for an AI agent, whether or not you want one. If all you wanted from Side Space was "save tabs into named groups, sync across devices," you're evaluating pricing built around a different, heavier feature.
• No one-time option anymore. If you specifically wanted to pay once and be done, that path is gone.

Amazing Tabs — manual, no-signup, keyword search

Full disclosure: we built Amazing Tabs for a narrower job than Side Copilot — explicitly saving tabs you choose and finding them fast, with no AI chat, no agent, and no cloud-sync requirement to use the free tier.

What it does differently:

• No signup on the free tier. Install and start saving immediately — no account, no cloud sync dependency.
• No AI layer at all. Nothing reads page content, chats about a tab, or automates actions in your browser.
• Open a new tab and press / to search every saved tab, group, or session by title, instantly.
• Free tier: 100 saved links, no signup required. Premium: $2.90/mo billed annually ($34.80/yr) or $4.90/mo monthly. Lifetime: $99 one-time, capped at 200 founders.

What we'll say honestly:

• If you actually use an AI agent to chat with pages or automate multi-step browser tasks, that's real functionality we don't have and don't plan to build — we don't run any AI inference on your tabs.
• We don't do "spaces" as a dedicated concept — just saved tabs, groups, and sessions you search by keyword.
• If a one-time payment matters to you, we still offer it; Side Copilot's old lifetime option is gone.

Try the manual, no-signup model. Add Amazing Tabs to Chrome — free, no account needed to start. Open a new tab after install, press / and search for a tab from last week.

Side-by-side

	Side Copilot (formerly Side Space)	Amazing Tabs
Core problem solved	AI chat/agent + tab spaces	Finding a saved tab fast
AI	Page chat (free), Agent Mode (paid)	None — no AI pipeline
Account required	Yes, even on free tier (cloud sync)	No, on free tier
Free tier	5 spaces, cloud sync, unlimited page-chat	100 saved links, no signup
Paid plan	Pro $2.90-4.90/mo, Pro+ $7.90-11.90/mo	$2.90/mo (annual) · $4.90/mo · $99 lifetime
One-time payment option	None currently	Yes, $99 lifetime (capped)
Cross-device sync	Yes, free tier	Yes (once signed in)

When you should stay on Side Copilot

• You want an AI agent that can answer questions about the page you're on or automate actions across it.
• You're already using "spaces" as your main organizing model and the 5-space free cap isn't a problem.
• Paying a small recurring subscription for AI features is fine with you.

The honest pick

Two answers cover most "Side Space alternative" searches:

• You want the AI chat/agent capability Side Copilot rebranded around. → Stay, and expect a recurring subscription if you need Agent Mode.
• You just wanted to save tabs into groups and find them again, no AI involved. → Amazing Tabs, with a free tier that needs no account at all.

Further reading: The best Chrome tab manager in 2026 for the full comparison landscape, or our Tabnxt alternative comparison if you're evaluating a different AI-grouping tool instead.

Add Amazing Tabs to Chrome — free → Install from the Chrome Web Store. No signup for 100 saved links, upgrade only if you want unlimited and cross-device sync. See pricing for the full breakdown — including the $99 lifetime deal (capped at 200 spots).