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Updated 11 Nov 2026 · prices read on vendor pages

11 best Sider AI alternatives in 2027

Mehmet ElmicenniReviewed by Mehmet Elmicenni, founder of Zekai•Prices checked •How we check

The short answer

The best Sider AI alternatives in 2027 are Monica (best overall, $8.3/mo), MaxAI (best free plan: 3 Pro chats per day) and NextAI Translator (best open source, AGPL-3.0). Sider AI itself starts at $10/mo. Zekai checked these prices on vendor pages on 11 Nov 2026; 8 more are compared below, including 4 with a free plan and 2 open source.

Open the Zekai Cost Finder Get price alerts
Best overallSee in table →
Monica logo

Monica

$8.3/mo · free plan

6.7
Best free planSee in table →
MaxAI logo

MaxAI

$12/mo · free plan

6.3
Best open sourceSee in table →
NextAI Translator logo

NextAI Translator

Free to self-host · AGPL-3.0

7.7
11alternatives compared
6with a free plan
3open source
$4.99/mocheapest paid · Gemini
$10/moSider AI starts at
01 · Zekai Price Ledger

Which Sider AI alternatives are worth it in 2027?

The closest Sider alternatives are Monica, MaxAI, Merlin and HARPA AI, all browser-based AI assistants. Monica's Pro costs $8.3 a month billed yearly against Sider's $10 Nano plan monthly. Claude, Gemini, Microsoft Copilot and ChatGPT are broader assistants that can replace the sidebar if you accept a single vendor.

ToolTypeStarting priceFree plan limitBest forCost for your teamChecked
Sider AIThe tool you are replacing
 You are here
$10/moNano, monthly
 No free plan Browser sidebar and agent with credits — 11 Nov 2026 Pricing ↗
Monica logo
Monica Zekai score 6.7Best overall
 Free plan + paid
$8.3/moPro, billed yearly ($99/year)
 40 basic-model accesses daily Multi-model sidebar plus agents — 11 Nov 2026 Pricing ↗
MaxAI logo
MaxAI Zekai score 6.3Best free plan
 Free plan + paid
$12/moPro, per member, billed yearly ($30 monthly)
 3 Pro chats per day, unlimited free chat Team-ready sidebar with a free tier — 11 Nov 2026 Pricing ↗
Merlin logo
Merlin Not yet reviewed by Zekai
Not checked
 No free plan AI sidebar with 70+ tools — 11 Nov 2026
HARPA AI logo
HARPA AI Zekai score 6.9
Not checked
 No free plan Browser automation with your own API keys — 11 Nov 2026
Claude Zekai score 9.4
 Free plan + paid
$17/moPro, billed yearly ($20 monthly)
 Limited usage every 5 hours and every week Assistant with Claude in Chrome — 11 Nov 2026 Pricing ↗
Gemini logo
Gemini Zekai score 8.7Cheapest paid
 Free plan + paid
$4.99/moGoogle AI Plus, monthly
 Free with a Google Account; usage limits apply Cheapest paid tier, Google-integrated — 11 Nov 2026 Pricing ↗
Microsoft Copilot logo
Microsoft Copilot Zekai score 6.8
 Free plan + paid
$19.99/moMicrosoft 365 Premium, monthly
 Free tier with lower usage than paid Microsoft 365 plans Copilot tied to Microsoft 365 apps — 11 Nov 2026 Pricing ↗
ChatGPT logo
ChatGPT Zekai score 9.3
 Free plan + paid
$20/moPlus, monthly
 Unlimited text chats with GPT-6; other features limited Single-vendor assistant used in its own app — 11 Nov 2026 Pricing ↗
NextAI Translator logo
NextAI Translator Zekai score 7.7Best open source
 Open source
Free (self-hosted)
 No limit, self-hosted (AGPL-3.0) Open-source in-page translation browser extension $0 14 Nov 2026 Code ↗
LibreChat logo
LibreChat Zekai score 7.7
 Open source
Free (self-hosted)
 No limit, self-hosted (MIT) Self-hosted chat across many providers $0 14 Nov 2026 Code ↗
Chatbox logo
Chatbox Zekai score 7.2
 Open source
Free (self-hosted)
 No limit, self-hosted (GPL-3.0) Desktop AI client for local models $0 14 Nov 2026 Code ↗

Every price was read on the vendor's own pricing page on the date shown. The Cost Finder assumes one entry plan per person, so it multiplies by your team size; yearly prices are shown per month, and team or business plans can cost more per seat. "Not checked" means we could not confirm a public price.

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02 · Free plan

Is there a free version of Sider AI?

Sider's pricing page, read signed out, lists four paid plans (Nano $10, Lite $25, Pro $50, Max $100 monthly) and no free plan, so a free allowance is not confirmed here. Check inside the extension. MaxAI and Monica both publish free plans for comparison.

Source: Sider AI pricing page, read 11 Nov 2026.

FreeNone

No free plan on the pricing page

Paid from$10/mo

Nano, monthly

03 · Free alternatives

What are the best free Sider AI alternatives?

MaxAI has the clearest free plan among extensions: unlimited chat on a fast model plus 3 Pro chats a day. Monica's Free lists 40 basic-model accesses daily, and Merlin has limited free access. Sider's pricing page shows only paid plans when signed out, so its own free allowance is not stated.

Monica logo

Monica

Best overallFree plan + paid
40 basic-model accesses daily
Paid from $8.3/mo
vs Sider AI →Zekai review
MaxAI logo

MaxAI

Best free planFree plan + paid
3 Pro chats per day, unlimited free chat
Paid from $12/mo
vs Sider AI →Zekai review

Claude

Free plan + paid
Limited usage every 5 hours and every week
Paid from $17/mo
vs Sider AI →Zekai review
Gemini logo

Gemini

Cheapest paidFree plan + paid
Free with a Google Account; usage limits apply
Paid from $4.99/mo
vs Sider AI →Zekai review
Microsoft Copilot logo

Microsoft Copilot

Free plan + paid
Free tier with lower usage than paid Microsoft 365 plans
Paid from $19.99/mo
vs Sider AI →Zekai review
ChatGPT logo

ChatGPT

Free plan + paid
Unlimited text chats with GPT-6; other features limited
Paid from $20/mo
vs Sider AI →Zekai review
04 · Open source

What are the best open-source Sider AI alternatives?

No open-source tool in our catalogue matches Sider's whole feature set. NextAI Translator (AGPL-3.0) is an open-source browser extension covering translation, while LibreChat (MIT) and Chatbox (GPL-3.0) are self-hosted or desktop chat clients rather than page-aware sidebars. All require your own API key.

NextAI Translator logo

NextAI Translator

AGPL-3.0★ 25k GitHub stars · Sep 2026
To self-host: The repo states a desktop app and a browser extension; translation calls need your own OpenAI-compatible API key.
Zekai open-source pageSource code ↗Managed hosting slot
LibreChat logo

LibreChat

MIT★ 45.1k GitHub stars · Sep 2026
To self-host: The repo states a Docker Compose deployment; you supply provider API keys plus a MongoDB database.
Zekai open-source pageSource code ↗Managed hosting slot
Chatbox logo

Chatbox

GPL-3.0★ 41.8k GitHub stars · Sep 2026
To self-host: The repo states a desktop app; add your own provider API keys or connect local models.
Zekai open-source pageSource code ↗Managed hosting slot
05 · Side by side

How does Sider AI compare with each alternative?

Sider's plans are credit-based, from Nano at $10 for 7,500 credits to Max at $100, and include Chat, Hand, Code and Create. Monica counts queries, MaxAI bills per member, Merlin prices Pro at $19 yearly, and HARPA offers a $240 lifetime plan using your own keys.

01
Monica logo

Sider AI vs Monica

Best overallFree plan + paid$8.3/mo · checked 11 Nov 20266.7
The differenceMonica's Pro plan is $8.3 a month billed yearly for 5,000 basic and 200 advanced model queries a month, with Deep Research and slides agents, compared with Sider's credit tiers.
Switch to Monica ifyou want a lower annual price and a fixed monthly query count instead of Sider's credit pools.
Stay with Sider AI ifyou want Sider's browser-driving Hand agent and the dedicated cloud computer on higher tiers.
Pros
  • Access multiple top-tier AI models (GPT, Claude, Gemini) in one interface.
  • Seamlessly integrates into existing workflows with browser extensions and apps.
Cons
  • Free plan has daily usage limits, requiring an upgrade for heavy use.
  • The sheer number of features can be overwhelming for new users.

Pros and cons from the Zekai review of Monica · Verdict: Versatile AI Productivity Hub

Visit MonicaRead the Zekai reviewPrice alert
02
MaxAI logo

Sider AI vs MaxAI

Best free planFree plan + paid$12/mo · checked 11 Nov 20266.3
The differenceMaxAI's pricing page shows Free with unlimited chat on a fast model and 3 Pro chats daily, and Pro at $12 per member monthly on yearly billing with team management.
Switch to MaxAI ifyou need per-member team billing and a free plan with unlimited chat on a fast model.
Stay with Sider AI ifyou want Sider's cloud-computer browser agent and its image, video and slide creation under one plan.
Pros
  • Works on any webpage via Chrome/Edge extension.
  • Combines multiple leading AI models (o1, GPT, Claude, Gemini) in one tool.
Cons
  • Advanced models are heavily restricted on the free plan.
  • Requires a paid plan for any significant daily use.

Pros and cons from the Zekai review of MaxAI · Verdict: Browser AI sidebar

Visit MaxAIRead the Zekai reviewPrice alert
03
Merlin logo

Sider AI vs Merlin

Not checked
The differenceMerlin's pricing page lists Pro at $19 a month billed yearly ($228) with unlimited access to basic models and 70+ AI tools, and a Teams plan at $15 per seat.
Switch to Merlin ifyou want unlimited basic-model use and a long list of single-purpose AI tools in the extension.
Stay with Sider AI ifyou want Sider's Hand agent that carries out tasks across real websites for you.
Visit MerlinPrice alert
04
HARPA AI logo

Sider AI vs HARPA AI

Not checked6.9
The differenceHARPA sells a one-time lifetime X plan at $240 where you bring your own API keys or web sessions, alongside S1 at $12 a month billed annually with a yearly token balance.
Switch to HARPA AI ifyou prefer a lifetime licence and want to connect your own ChatGPT, Claude or Gemini accounts.
Stay with Sider AI ifyou want credits-based plans that include image and video generation without supplying keys.
Pros
  • Works on any website, providing contextual AI assistance.
  • Supports multiple leading LLMs, offering flexibility.
Cons
  • Advanced automation features have a notable learning curve.
  • Browser-only; no standalone desktop or mobile app.

Pros and cons from the Zekai review of HARPA AI · Verdict: Versatile Browser Copilot

Visit HARPA AIRead the Zekai reviewPrice alert
05

Sider AI vs Claude

Free plan + paid$17/mo · checked 11 Nov 20269.4
The differenceClaude's Pro plan, $17 a month on annual billing, includes Claude in Chrome and Microsoft 365 integration, but it only runs Anthropic models rather than several vendors' models.
Switch to Claude ifyou accept a single model family and want its Chrome extension included with chat and Projects.
Stay with Sider AI ifyou want GPT, Gemini, DeepSeek and other vendors' models together in one sidebar.
Pros
  • Excellent at summarizing and analyzing long, complex documents.
  • Generates high-quality, natural-sounding educational content.
Cons
  • Free tier has usage limits that reset every few hours, which can interrupt workflow.
  • Lacks built-in DALL-E style image generation capabilities.

Pros and cons from the Zekai review of Claude · Verdict: Deep Document Analysis

Visit ClaudeRead the Zekai reviewPrice alert
06
Gemini logo

Sider AI vs Gemini

Cheapest paidFree plan + paid$4.99/mo · checked 11 Nov 20268.7
The differenceGemini's Google AI Plus is $4.99 a month with 2x the free usage limits, and AI Pro is $19.99; every plan is tied to a Google Account.
Switch to Gemini ifyou want the lowest paid entry price and your browsing already runs through a Google Account.
Stay with Sider AI ifyou want a vendor-neutral sidebar offering several labs' models and a browser-automation agent.
Pros
  • Free access to a highly capable base model
  • Directly integrated with the Google ecosystem and search
Cons
  • Outputs require rigorous fact-checking for academic use
  • Can generate plausible but incorrect information (hallucinations)

Pros and cons from the Zekai review of Gemini · Verdict: Top-Tier Study Partner

Visit GeminiRead the Zekai reviewPrice alert
07
Microsoft Copilot logo

Sider AI vs Microsoft Copilot

Free plan + paid$19.99/mo · checked 11 Nov 20266.8
The differenceMicrosoft's Premium plan at $19.99 a month bundles Copilot with Word, Excel, PowerPoint and Outlook desktop apps plus 1 TB of storage, rather than a browser sidebar alone.
Switch to Microsoft Copilot ifyou want Copilot included with Office apps and cloud storage in one Microsoft subscription.
Stay with Sider AI ifyou only need a browser sidebar and do not want a Microsoft 365 bundle.
Pros
  • Free version is highly capable for many tasks
  • Extremely easy to use with no learning curve
Cons
  • Not specialized for professional writing or translation workflows
  • Lacks advanced features like style guides or terminology management

Pros and cons from the Zekai review of Microsoft Copilot · Verdict: Powerful Generalist AI

Visit Microsoft CopilotRead the Zekai reviewPrice alert
08
ChatGPT logo

Sider AI vs ChatGPT

Free plan + paid$20/mo · checked 11 Nov 20269.3
The differenceChatGPT's Go plan is $6 a month and Plus $20; both run OpenAI models in the ChatGPT app rather than a sidebar placed over any web page.
Switch to ChatGPT ifyou want OpenAI's models only, with an inexpensive $6 Go tier available.
Stay with Sider AI ifyou want an assistant that sits beside whatever page is open and summarises it in place.
Pros
  • ChatGPT's context understanding enables Marketing & Content Creation teams to generate high-quality content that resonates with their audience.
  • The tool's conversation flow and memory features allow for seamless content iteration and refinement.
Cons
  • The lack of explicit brand voice and tone guidance may require additional setup and fine-tuning for Marketing & Content Creation teams.
  • ChatGPT's limitations in handling extremely complex or niche topics may necessitate additional research and editing.

Pros and cons from the Zekai review of ChatGPT

Visit ChatGPTRead the Zekai reviewPrice alert
09
NextAI Translator logo

Sider AI vs NextAI Translator

Best open sourceOpen sourceFree (self-hosted)7.7
The differenceNextAI Translator is a cross-platform desktop app and browser extension for ChatGPT-powered translation, covering one of Sider's functions rather than its full chat and agent set.
Switch to NextAI Translator iftranslating selected text is your main use and you want AGPL-3.0 code running with your own key.
Stay with Sider AI ifyou need summaries, chat with PDFs and an agent, not translation alone.
Visit NextAI TranslatorRead the Zekai reviewPrice alert
10
LibreChat logo

Sider AI vs LibreChat

Open sourceFree (self-hosted)7.7
The differenceLibreChat is a self-hosted chat site connecting several providers with agents and MCP, but it is a web app you open, not an extension on top of the page.
Switch to LibreChat ifyou want to host your own multi-model chat and control stored conversations.
Stay with Sider AI ifyou want an in-browser sidebar that reads the page you are on without hosting anything.
Visit LibreChatRead the Zekai reviewPrice alert
11
Chatbox logo

Sider AI vs Chatbox

Open sourceFree (self-hosted)7.2
The differenceChatbox is a GPL-3.0 desktop client for multiple model providers and local models; it works as a separate window instead of a page-aware browser sidebar.
Switch to Chatbox ifyou want a free desktop client with your own keys or local models.
Stay with Sider AI ifyou want the assistant inside the browser reading the open tab.
Visit ChatboxRead the Zekai reviewPrice alert
07 · FAQ

Questions people ask about Sider AI alternatives

What is the best alternative to Sider AI in 2027?

Monica is the best overall Sider AI alternative on this page ($8.3/mo). For no cost, MaxAI has a free plan (3 Pro chats per day, unlimited free chat). To self-host, NextAI Translator is open source (AGPL-3.0).

Is there a free version of Sider AI?

No. Sider AI has no free plan; paid plans start at $10/mo, checked on 11 Nov 2026.

Is there a 100% free alternative to Sider AI?

Yes. NextAI Translator, LibreChat, Chatbox are open source and free to self-host. Monica, MaxAI, Claude, Gemini, Microsoft Copilot, ChatGPT have a free plan with limits, shown in the table.

What is cheaper than Sider AI?

Gemini starts at $4.99/mo, against $10/mo for Sider AI, as listed on each vendor's pricing page on 11 Nov 2026.

How much do Sider AI alternatives cost for a team of 5?

If each of 5 people buys the entry paid plan, at the prices Zekai checked on 11 Nov 2026, the monthly cost is Gemini $24.95/mo, Monica $41.50/mo, MaxAI $60/mo, against Sider AI $50/mo for Sider AI. Team and business plans can cost more per seat. The Zekai Cost Finder on this page recalculates for any team size.

Which is better, Monica or Sider AI?

Monica's Pro plan is $8.3 a month billed yearly for 5,000 basic and 200 advanced model queries a month, with Deep Research and slides agents, compared with Sider's credit tiers. Choose Monica if you want a lower annual price and a fixed monthly query count instead of Sider's credit pools. Stay with Sider AI if you want Sider's browser-driving Hand agent and the dedicated cloud computer on higher tiers.

What is better than Sider?

Monica is the nearest like-for-like extension, MaxAI suits teams, and Claude or Gemini fit if you want a single vendor's own browser assistant.

08 · Method

How did Zekai check this page?

Zekai independently reviews AI tools. For this page we read each vendor's own pricing and product pages and recorded the starting price, the free-plan limit and the date of the check. Only tools that do the same job as Sider AI are listed, and sponsors never change the order or the scores.

Mehmet Elmicenni, founder of Zekai
Mehmet Elmicenni

Founder of Zekai. Reviews the alternatives pages and the price checks behind them.

About the founder · How Zekai scores tools

JSON copyMarkdown copy
1 · Same job onlyEvery alternative does the same task as Sider AI; tools for other jobs are left out.
2 · Vendor pages onlyPrices and free limits come from each vendor's own pricing page, never from blogs.
Zekai score0–10, from four published weights: ease 25%, output quality 30%, value 20%, time saved 25%. How we score
3 · Re-checkedA price older than 35 days is re-read or the page falls back to an older version.
Change log

  • Page rebuilt on v6; all prices re-read on vendor pages.

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