Software Alternatives, Accelerators & Startups

Side Space VS RepDB

Compare Side Space VS RepDB and see what are their differences

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Side Space logo Side Space

The World's First Al Assistant for Your Tabs

RepDB logo RepDB

Exercise dataset for fitness apps: transparent background, animations, no subscription
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  • Side Space
    Image date //
    2025-11-17
  • Side Space
    Image date //
    2025-05-13

An Al-powered vertical tabs manager in your side panel.

An alternative to Arcโ€™s Sidebar and Edgeโ€™s Vertical Tabs โ€” now upgraded with a built-in AI assistant.

Side Space gives you complete control over your browsing experience with powerful vertical tab management and Side Copilot, an AI that helps you research, organize, and automate your workflow directly from the side panel.

๐Ÿš€ How do vertical tabs work?

When vertical tabs are enabled, your open tabs are moved from the top of the browser window to the left side panel. This layout stacks tabs vertically instead of horizontally, giving you more space, better visibility, and easier navigationโ€”especially when working with many tabs.

โœจ Features

  • โšก๏ธ Vertical Tabs Panel โ€” Manage tabs and tab groups efficiently in a clean, space-saving sidebar.
  • ๐Ÿ—‚๏ธ Save, restore, and reorder tabs or tab groups with intuitive drag-and-drop.
  • ๐Ÿ”„ Side-by-side layout that keeps all your open tabs visible at a glance.
  • ๐Ÿ” Fuzzy search to instantly find the tab you're looking for.
  • ๐Ÿงน Suspend tabs to save memory and keep your browser running smoothly.
  • โ˜๏ธ Cloud sync (cross-browser) with a single login.
  • ๐ŸŒ› Dark Mode support.
  • ๐Ÿ’พ Space Backup Solutions

    • ๐Ÿ“‘ Export sessions as JSON
    • โ˜๏ธ Sync to the cloud via login
  • โœจ AI-powered Tab Grouping for automatically organizing related tabs.

  • ๐Ÿ”— Group Guardian automatically groups tabs based on URL patterns.

๐Ÿค– Introducing Side Copilot โ€” Your AI Assistant in the Side Panel

Side Copilot brings AI directly into your browsing workflow:

  • Ask questions about the page you're viewing
  • Research topics with auto-opened results
  • Summarize long articles instantly
  • Organize tabs and windows through natural language commands
  • Trigger automated actions across your browser

Just open AI Chat in the extension and start talking to your browser โ€” it does the rest.

  • RepDB Standard exercise dataset
    Standard exercise dataset //
    2026-08-15
  • RepDB Starter tier
    Starter tier //
    2026-08-15

RepDB is a one-time-purchase exercise dataset for developers building fitness and workout apps โ€” not a subscription, not a rate-limited API. You download the data once and own it: JSON (and SQLite on the higher tier), WebP images, and full EN/DE/ES translations, with no per-request billing and no dependency on our servers staying up.

A free tier includes 250 exercises with flat-style 512ร—512 images, attribution-licensed for commercial in-app use. The Starter tier ($199) adds the full catalog in classic white-background style. Standard ($399) adds transparent 1024px images, looping animations, exercise relations (similar/progressions/regressions), workout templates, and embeddings โ€” exclusive to that tier.

Every exercise includes muscle-group highlighting, equipment/muscle icons, MET values, and safety/goal tags. Compared to GIF- or JPG-based competitor APIs, RepDB images are transparent WebP with no watermarks, so they drop into any app UI without a white box around them.

Side Space

$ Details
Free Trial $39 / One-off
Platforms
Google Chrome Firefox Edge Brave Comet Opera
Release Date
2023 October
Startup details
Country
Hong Kong
Founder(s)
Robert Shaw
Employees
1 - 9

RepDB

Website
repdb.co
$ Details
freemium $299 / One-off
Platforms
Web Mobile
Release Date
2026 July

Side Space features and specs

  • ๐ŸŒˆ Arc-like Side Panel
    Weโ€™ve built an Arc-like side panel that transforms your tabs into a sleek vertical layout, making it easier than ever to navigate and manage your workspace.
  • ๐Ÿง  Smart AI Grouping
    Itโ€™s not just about organizing tabsโ€”itโ€™s about doing it intelligently. Our AI grouping feature clusters tabs based on content for a streamlined experience. Plus, you have control with our Group Guardian feature, letting you customize tab groupings using URL matches to set your own organizational rules.
  • โ˜๏ธ Spaces & Cloud Sync
    Take productivity to the next level! Save your tabs into different Spaces and we automatically sync them to the cloud. Your organized tabs are accessible across devices, so you can browse seamlessly wherever you are.
  • ๐Ÿค– AI Assistant
    Research, summarize, and organize, chat with your tabs and let Al Assistant help you browse smarter.

RepDB features and specs

  • WebP Format Benefits
    start+peak exercise images
  • JSON
    relations, metadata, equipment
  • Transparency
    transparent background
  • Animations
    Animated loops in paid tier

Analysis of Side Space

Overall verdict

  • SideSpace is a well-regarded browser productivity tool that helps users organize their tabs and workspaces efficiently, making it a solid choice for anyone who struggles with tab overload.

Why this product is good

  • Helps organize and group browser tabs into dedicated spaces, reducing clutter
  • Improves productivity by allowing quick switching between different projects or contexts
  • Offers a clean, intuitive interface that's easy to adopt
  • Saves and restores tab sessions so you never lose your place
  • Reduces memory usage by managing inactive tabs effectively

Recommended for

  • Power users who juggle many browser tabs at once
  • Professionals managing multiple projects or clients simultaneously
  • Researchers and students who need to organize reference materials
  • Remote workers seeking better digital workspace organization
  • Anyone prone to tab overload looking to streamline their browsing

Side Space videos

Side Space 2.0 | The World First AI Assistant for your Tabs

More videos:

  • Demo - Introducing Side Space 1.0

RepDB videos

No RepDB videos yet. You could help us improve this page by suggesting one.

Add video

Category Popularity

0-100% (relative to Side Space and RepDB)
Chrome Extensions
100 100%
0% 0
Datasets
0 0%
100% 100
Productivity
100 100%
0% 0
Developer Tools
0 0%
100% 100

Questions & Answers

As answered by people managing Side Space and RepDB.

What makes your product unique?

Side Space's answer

Side Space combines powerful vertical tab management with an integrated AI assistant, that's something no other browser extension offers.

Instead of choosing between a better tab manager or an AI browser, Side Space gives you both in one clean side panel.

RepDB's answer:

RepDB is sold as a one-time download, not a metered API โ€” you own the JSON/SQLite data and WebP images outright, with no rate limits, no per-request billing, and no risk of the vendor cutting off access. It's also the only dataset in this space with EN/DE/ES translations, transparent (alpha-channel) images with no watermark, muscle-group highlighting, safety/goal tags, and looping animations on the higher tier.

What's the story behind your product?

Side Space's answer

I am the kind of person who always ends up with too many tabs, too many windows, and no idea where that one page I read yesterday has gone. I tried a bunch of the new AI browsers, but they all felt like replacements for tools I already rely on. I didnโ€™t want a new browser. I just wanted my existing one to feel less chaotic.

So I built Side Copilot for myself first. It helps me manage tabs, jump between windows, find stuff I opened days ago, and generally clean up the mess I constantly create. The thing that changed everything for me was giving it the ability to understand natural commands. I can tell it to group my research tabs or bring back an article from last week and it actually does it. It also has a simple chat mode for quick summaries or translating a page on the spot.

I realized it solved a real problem for me, so I decided to make Side Copilot completely free. Iโ€™m curious how other heavy browser users feel about this. Would an assistant like this make your browsing less stressful?

RepDB's answer:

RepDB grew out of a consumer workout app its creator was building solo. Sourcing exercise images and data meant either paying for a subscription API with usage caps and no caching rights, or producing everything from scratch. The illustrated, multi-language dataset was built for us first, then split out as its own product once it became clear other indie developers had the same problem and preferred to buy the data outright rather than rent it through an API.

Why should a person choose your product over its competitors?

Side Space's answer

  1. The worldโ€™s first AI assistant built for your tabs

Most AI tools only analyze text. Side Copilot controls your tabs, windows, history, and pages using real browser APIs. You can research, summarize, organize, open sites, perform searches, restore sessions, and automate actions โ€” all with natural language.

  1. A true vertical tabs manager, not a browser replacement

You donโ€™t need to switch to Arc or Edge. Side Space turns Chromeโ€™s side panel into a clean vertical tabs system with:

Drag-and-drop tab & group management

Fuzzy search

Memory-saving tab suspension

Saved spaces & session restore

Cloud sync

Dark mode

You get a modern browser experience without leaving Chrome.

  1. Dual AI modes for different tasks

Chat Mode โ†’ instant content analysis (summary, translation, extraction, quick answers)

Agent Mode โ†’ deep automation (organize tabs, clean up windows, run research workflows)

Fast when you need speed, powerful when you need automation.

  1. Page, tab, window, and history tools powered by real browser capabilities

Side Copilot isnโ€™t โ€œjust another chatbot.โ€ It uses more than 20 AI MCP tools built on Chrome Extension APIs:

Tab tools: create, close, group, move

Window tools: tile, arrange, focus

History tools: analyze, find, reopen past pages

Page interaction tools: scroll, navigate, search, capture screenshots

Session tools: restore recently closed tabs/windows

This gives Side Space automation capabilities even AI browsers donโ€™t have.

RepDB's answer:

Most alternatives are subscription APIs โ€” you pay monthly, you're capped on requests, and ExerciseDB's terms of use explicitly forbid caching or storing the data at all, so every image render is a live paid API call. RepDB is the opposite: pay once, download the files, self-host with zero ongoing dependency. It's also the only option offering true DE/ES localization and transparent images instead of a white box behind every exercise.

How would you describe the primary audience of your product?

Side Space's answer

Side Space is designed for anyone who works, researches, or creates directly in the browser โ€” especially those who manage dozens of tabs every day. If the browser is your workspace, this is for you.

Productivity-Driven Professionals

Marketers, PMs, developers, designers, analysts โ€” anyone who needs a smarter, faster way to organize tabs, windows, and workflows.

Power Browsers with Endless Tabs

For users juggling 20โ€“200+ tabs across multiple windows. Side Space brings structure, clarity, and smart automation without forcing you to switch browsers.

AI-Forward Users

If you want to control your browser with natural language, automate tasks, and let Side Copilot handle the heavy lifting, this is your perfect tool.

Researchers & Knowledge Workers

Students, academics, journalists, content creators, and anyone who collects and analyzes information online. Summarize, extract, search, and research pages instantly.

People Who Want Arc/Edge-Style Features โ€” But in Chrome

Enjoy a vertical tabs manager, powerful side panel, and full AI assistant experience without giving up the browser you already love.

RepDB's answer:

Solo developers and small teams building fitness or workout-tracking apps (iOS, Android, web) who need licensed exercise images and structured exercise data, but don't want to build their own media pipeline or depend on a rate-limited third-party API.

User comments

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What are some alternatives?

When comparing Side Space and RepDB, you can also consider the following products

OneTab - Whenever you find yourself with too many tabs, click the OneTab icon to convert all of your tabs into a list. When you need to access the tabs again, you can either restore them individually or all at once.

Workona - A better way to work in the browser.

tabExtend - Easily save tabs and quickly create notes in your browser

Skipper.co - Tab management that works with ADHD brains

Tab Shelf - Side panel vertical tabs for Chrome and Edge

Sidekick Browser - The fastest browser for work ever made