# MARK•R vs Sider

MARK•R records 43 monthly visits with -95.1% month-over-month growth and Freemium pricing. Sider records 2,644,740 monthly visits with -10.6% growth and Freemium pricing.

| Metric | [MARK•R](https://openaitools.app/tool/mark-r) | [Sider](https://openaitools.app/tool/sider) |
| :--- | :--- | :--- |
| Website URL | https://mark-r.com | https://sider.ai |
| Categories | AI Assistant, AI Copilot, AI Writing Assistants, AI Research Tool | AI Assistant, AI Chatbot, AI Writing Assistants, AI Reader |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 43 | 2,644,740 |
| MoM Growth Rate | -95.1% | -10.6% |
| Primary Market | Global | United States |
| Direct Visits | 16 | 1,699,535 |
| Review Score | 4.2 | 4.5 |
| Saved Count | 0 | 31 |
| Supported Platforms | Website | Website |

## MARK•R

MARK•R is a browser plugin built around one interaction: highlight text, then talk to it. Instead of copying a passage into a separate chatbot, you select it on the page and a small icon appears with an AI input field. Whatever you ask is answered inline, in the flow of reading, which keeps the source material and the conversation in the same visual context.

The distinguishing design decision is that MARK•R does not restrict itself to the highlighted fragment. It reads the surrounding page as well, so questions can be about the wider argument, the definitions used elsewhere in the article, or the assumptions behind a claim. That makes it more useful for interpretation and analysis than a simple selected-text rewriter, and it is the reason the plugin is marketed for research, study and content development rather than only for editing.

Practical applications cluster around comprehension and production. Students and researchers use it to unpack difficult concepts and terminology; professionals use it to clarify technical, legal or medical language; writers and marketers use it to generate summaries, outlines and alternative phrasing; and anyone drafting email in a browser can highlight the message they received and ask for suggested replies. Access is tiered: a free plan with a modest daily allowance of GPT-3.5 calls, paid Standard and Pro plans that add higher limits and GPT-4, and custom builds for organisations. The published plan structure references GPT-3.5 and GPT-4, so newer model options may not be available on this tool.

**Pricing & Plans:** Freemium. A free tier provides 15 calls per day, 2,000 highlighted characters, 500 characters of prompt input, GPT-3.5 and 1,000 output characters. Standard is $8 per month and Pro is $12 per month, adding higher daily call limits, larger character allowances, longer output and GPT-4 access (one GPT-4 call equals 20 GPT-3.5 calls). Custom builds are available for organisations and enterprises.

- **Highlight-to-ask interaction:** Selecting any passage on a page activates a dynamic icon and AI prompt field, so a question can be asked at the exact place you are reading rather than in a separate chat window.
- **Whole-page context:** Responses draw on the surrounding article or page, not just the highlighted fragment, which supports deeper questions about argument, terminology and implications.
- **Inline content generation:** Ask for an executive summary, a white-paper outline, slide talking points, suggested email replies or rewritten copy without leaving the browser.
- **Comprehension support:** Explain difficult terms, unpack technical or legal jargon and request simpler phrasing, which helps with dense academic, medical and financial material.
- **Tiered daily allowances:** Free, Standard and Pro plans set different daily call limits, character allowances, output lengths and model access, with custom enterprise builds available.

**Strengths:** Works inline on any page, so you never have to copy text into another tool; Uses the whole page as context, not just the highlighted passage; Low entry price with a genuinely usable free tier and clear plan differences; Broad range of applications from study and research to summaries and email replies

[Profile (Markdown)](https://openaitools.app/tool/mark-r.md)

## Sider

Sider's premise is that you should not have to leave the page you are reading to use an AI assistant. Its sidebar overlays the browser, detects the content in view, and responds with chat, summaries, translations or explanations using frontier models from multiple providers. The result is a lightweight research and reading workflow: highlight a paragraph, ask for a simpler explanation, translate a PDF and keep the original in sight.

Recent versions push Sider beyond chat. Sider Hand is a browser agent that works across real websites and uses your logged-in sessions to carry out multi-step jobs such as comparing prices while shopping, filling forms, doing cross-site research or triaging a Gmail inbox. Sider Code goes the other way, letting you instruct changes to a website's appearance or behaviour in plain language and preserving the customisation for next time. A Create module generates images, videos, slides and documents from the same panel.

Pricing moves from a limited free tier to credit-based paid plans aimed at heavier users. Lower plans suit occasional chat, summarisation and translation, while higher tiers add a dedicated cloud computer that keeps the browser agent running around the clock and a larger monthly credit allowance. Sider ships as browser extensions for Chrome and Edge plus desktop and mobile apps for macOS, Windows, iOS and Android, and is used by a very large installed base.

**Pricing & Plans:** Freemium. Free tier available with limited credits; paid plans advertised at roughly US$10/month for occasional use up to around US$100/month at the top tier, with higher credit allowances and a dedicated cloud computer on the upper plans.

- **AI sidebar on any page:** A persistent panel that reads the page you are on and answers follow-ups with GPT, Claude or Gemini without copying content into another tab.
- **Summarise and chat with documents:** Summarise long articles, PDFs and YouTube videos, extract key points, and ask detailed questions about the source material.
- **Translation and read-aloud:** Translate webpages, PDFs and images, compare bilingual output side by side, and have content read aloud for review on the move.
- **Sider Hand browser agent:** Delegate multi-step tasks across real websites — price comparison, form filling, research and inbox triage — using your existing logged-in sessions.
- **Sider Code page customisation:** Describe a change in plain words and have Sider restyle or simplify any website, remembering the modification for future visits.

**Strengths:** Works inside the browser you already use, with no context switching; Access to multiple frontier models from one subscription; Strong reading toolkit: PDF chat, YouTube summaries, translation and read-aloud; Increasingly capable agent features for multi-step browser tasks

**Limitations:** Useful credits run out quickly on the free and lower tiers; Model availability and quota rules change over time, so expectations must be checked per plan; Some agent and code features depend on a cloud machine and heavier plans

[Profile (Markdown)](https://openaitools.app/tool/sider.md)

## Frequently Asked Questions

### How do MARK•R and Sider compare in monthly traffic?

MARK•R has 43 monthly visits, while Sider has 2,644,740. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

MARK•R has a month-over-month growth rate of -95.1%; Sider has -10.6%.

### How does pricing compare?

MARK•R: Freemium. Freemium. A free tier provides 15 calls per day, 2,000 highlighted characters, 500 characters of prompt input, GPT-3.5 and 1,000 output characters. Standard is $8 per month and Pro is $12 per month, adding higher daily call limits, larger character allowances, longer output and GPT-4 access (one GPT-4 call equals 20 GPT-3.5 calls). Custom builds are available for organisations and enterprises. Sider: Freemium. Freemium. Free tier available with limited credits; paid plans advertised at roughly US$10/month for occasional use up to around US$100/month at the top tier, with higher credit allowances and a dedicated cloud computer on the upper plans.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [ChatGPT](https://openaitools.app/tool/chatgpt-4) | 6,048,022,723 | +2.2% | Freemium | OpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research. | [.md](https://openaitools.app/tool/chatgpt-4.md) |
| 2 | [Claude](https://openaitools.app/tool/claude-2) | 1,253,439,413 | +23.8% | Freemium | Anthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing. | [.md](https://openaitools.app/tool/claude-2.md) |
| 3 | [Perplexity](https://openaitools.app/tool/perplexity-ai) | 88,310,223 | -3.7% | Freemium | Real-time AI answer engine and research workspace combining live web citations with frontier reasoning models. | [.md](https://openaitools.app/tool/perplexity-ai.md) |
| 4 | [Monica](https://openaitools.app/tool/monica-ai) | 4,512,775 | -11.3% | Freemium | Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools. | [.md](https://openaitools.app/tool/monica-ai.md) |
| 5 | [Merlin AI](https://openaitools.app/tool/merlin-ai) | 1,382,634 | +13.1% | Freemium | Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features. | [.md](https://openaitools.app/tool/merlin-ai.md) |
| 6 | [Glasp](https://openaitools.app/tool/glasp) | 889,564 | -14.1% | Freemium | Highlight the web, learn in public, and build your AI clone | [.md](https://openaitools.app/tool/glasp.md) |
| 7 | [HARPA AI](https://openaitools.app/tool/harpa-ai) | 537,461 | +99.3% | Freemium | Excels at advanced web automation and data extraction alongside chat, but has a steeper learning curve than Sider. | [.md](https://openaitools.app/tool/harpa-ai.md) |
| 8 | [Glarity](https://openaitools.app/tool/glarity-summarize-google-and-youtube) | 188,823 | -49.6% | Freemium | Summarize YouTube, Google, and any page with AI — free in your browser | [.md](https://openaitools.app/tool/glarity-summarize-google-and-youtube.md) |
| 9 | [Kome AI](https://openaitools.app/tool/kome-ai) | 174,910 | -6.5% | Freemium | Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider. | [.md](https://openaitools.app/tool/kome-ai.md) |
| 10 | [Voilà — AI Assistant, Chat and Writer](https://openaitools.app/tool/voil-chatgpt-browser-assistant) | 152,170 | -4.8% | Freemium | Delivers streamlined inline writing and webpage summarization via a browser extension, but with fewer custom sidebar tools. | [.md](https://openaitools.app/tool/voil-chatgpt-browser-assistant.md) |

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Source: https://openaitools.app/compare/mark-r-vs-sider

More Markdown: [Categories](https://openaitools.app/categories.md) · [Traffic rankings](https://openaitools.app/rankings.md) · [llms.txt](https://openaitools.app/llms.txt)