# LanguageTool vs Side Reader

LanguageTool records 5,707,795 monthly visits with -4.2% month-over-month growth and Freemium pricing. Side Reader records 355 monthly visits with -36.5% growth and Freemium pricing.

| Metric | [LanguageTool](https://openaitools.app/tool/languagetool) | [Side Reader](https://openaitools.app/tool/side-reader) |
| :--- | :--- | :--- |
| Website URL | https://languagetool.org | https://www.side-reader.com |
| Categories | AI Grammar Checker, AI Paraphraser, AI Spell Check, AI Proofreading | AI PDF, AI Reader, AI Chatbot, AI PDF Summarizer |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 5,707,795 | 355 |
| MoM Growth Rate | -4.2% | -36.5% |
| Primary Market | Brazil | Vietnam |
| Direct Visits | 3,228,530 | 149 |
| Review Score | 4.3 | 2.4 |
| Saved Count | 19 | 0 |
| Supported Platforms | Website | Website |

## LanguageTool

LanguageTool is one of the most widely used writing assistants, trusted by thousands of organizations and millions of users. Paste text or type directly into the editor and it highlights grammar, spelling and punctuation mistakes as you write, suggesting corrections in real time. Its "Picky Mode" and style suggestions go beyond basics to catch overused phrases, redundant words and awkward phrasing.

It works where you write. Browser add-ons for Chrome, Edge, Firefox, Safari and Opera check text across any website or email, while integrations for Google Docs, Microsoft Word, LibreOffice, Gmail, Outlook and dedicated Windows and macOS apps cover office workflows. LanguageTool also functions as an international spell checker, automatically detecting the language you are using and supporting regional variants such as US, UK and Australian English.

Beyond proofreading, LanguageTool includes a paraphrasing tool that rewrites sentences to sound more formal, fluent, simple or concise. A free tier covers spelling and basic checks, while Premium unlocks unlimited paraphrasing, advanced style suggestions and personal dictionaries. Organizations can deploy GDPR-compliant LanguageTool for Business for consistent brand voice across teams.

**Pricing & Plans:** Freemium. A free version handles spelling and basic grammar, while Premium unlocks unlimited paraphrasing, advanced style checks and more suggestions. LanguageTool for Business adds team and enterprise features.

- **Grammar, spelling and punctuation checks:** Detects grammatical errors, typos, punctuation issues and casing mistakes across 30+ languages.
- **AI paraphrasing tool:** Rephrase any sentence to be more formal, fluent, simple or concise with AI-driven suggestions.
- **Works everywhere you write:** Browser add-ons plus Google Docs, Word, LibreOffice, Gmail and Outlook integrations, and desktop apps.
- **Style and Picky Mode:** Advanced suggestions flag overused phrases, redundancy and wording that weakens your text.
- **Statistics and personal dictionary:** Track errors and suggestions over time and store custom words for consistent, personalized checking.

**Strengths:** Exceptionally broad language coverage with 30+ languages and variants; Works across browsers, office suites and email with minimal setup; Strong privacy stance and a GDPR-compliant business option

**Limitations:** Unlimited paraphrasing and advanced style suggestions require Premium; Some nuanced stylistic edits are still best judged by a human editor

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

## Side Reader

Side Reader exists to remove the friction of working with documents and AI chatbots at the same time. Normally you either paste chunks of a PDF into a chat window or juggle two tabs and lose your place. Side Reader is a Chrome extension that renders the PDF in the sidebar of ChatGPT, Claude or DeepSeek, so the document and the conversation sit side by side.

Once a PDF is open you use built-in action buttons to summarize, translate or explain content, and you can customize those button prompts so the AI answers in your preferred format. For content that cannot be selected — charts, infographics, scanned images — a screenshot question lets you ask about a region of the page directly. The reader itself supports zoom, page navigation and width adjustment, so it behaves like a normal PDF viewer rather than a stripped-down preview.

Privacy is handled simply: PDFs are stored locally in your browser and Side Reader does not keep your files. Because the AI work happens inside the ChatGPT, Claude or DeepSeek session you are already using, Side Reader adds document handling rather than a separate subscription to yet another model.

**Pricing & Plans:** Freemium. The core Chrome extension is available to install, with a paid upgrade for extended usage; check the extension listing for current limits.

- **Read PDFs beside the chat:** PDFs render directly in the sidebar next to the chat, so your document and the AI conversation are visible at the same time.
- **Summarize, translate and explain:** Summarize a whole document, translate it, or have passages explained in simpler terms using the AI you are already signed into.
- **Custom action button prompts:** Built-in buttons cover the common actions, and you can edit their prompts to make the AI respond in the format and tone you need.
- **Screenshot questions for non-selectable content:** Ask about charts, scans or regions that cannot be selected by taking a screenshot question instead.
- **Local storage and a proper reader:** Files stay local in your browser and are not stored by Side Reader, and PDFs keep zoom, page navigation and width controls.

**Strengths:** Keeps the PDF and the AI conversation visible in the same window; Works with ChatGPT, Claude and DeepSeek rather than locking you into one model; Local-only file storage — documents are not kept on Side Reader servers; Customizable action prompts for repeatable workflows

**Limitations:** Requires an active ChatGPT, Claude or DeepSeek session to do the AI work; Chrome only — no Firefox, Safari or Edge-specific edition; Very new/small product, so the feature set is still evolving

[Profile (Markdown)](https://openaitools.app/tool/side-reader.md)

## Frequently Asked Questions

### How do LanguageTool and Side Reader compare in monthly traffic?

LanguageTool has 5,707,795 monthly visits, while Side Reader has 355. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

LanguageTool has a month-over-month growth rate of -4.2%; Side Reader has -36.5%.

### How does pricing compare?

LanguageTool: Freemium. Freemium. A free version handles spelling and basic grammar, while Premium unlocks unlimited paraphrasing, advanced style checks and more suggestions. LanguageTool for Business adds team and enterprise features. Side Reader: Freemium. Freemium. The core Chrome extension is available to install, with a paid upgrade for extended usage; check the extension listing for current limits.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [DeepL](https://openaitools.app/tool/deepl) | 95,110,871 | -1.7% | Freemium | Enterprise-grade neural machine translation, AI writing refinement, and real-time voice translation across thirty-plus global languages. | [.md](https://openaitools.app/tool/deepl.md) |
| 2 | [Grammarly](https://openaitools.app/tool/grammarly) | 58,867,412 | -1.5% | Freemium | A premier cross-platform writing assistant offering robust real-time grammar checks, tone alignment, and style suggestions. | [.md](https://openaitools.app/tool/grammarly.md) |
| 3 | [QuillBot Paraphraser](https://openaitools.app/tool/quillbot-paraphraser) | 36,630,337 | +2.3% | Freemium | An AI writing assistant specializing in advanced paraphrasing and text rewriting alongside built-in grammar checks. | [.md](https://openaitools.app/tool/quillbot-paraphraser.md) |
| 4 | [Scribbr](https://openaitools.app/tool/scribbr) | 7,530,803 | +14.6% | Freemium | Academic proofreading, plagiarism checking and AI-powered writing tools in one place | [.md](https://openaitools.app/tool/scribbr.md) |
| 5 | [SciSpace](https://openaitools.app/tool/scispace) | 4,464,111 | +8.6% | Freemium | AI research platform for reading, understanding and writing scientific papers | [.md](https://openaitools.app/tool/scispace.md) |
| 6 | [PDFgear](https://openaitools.app/tool/pdfgear) | 2,845,280 | -3.4% | Free | A free, AI-powered PDF editor for every device | [.md](https://openaitools.app/tool/pdfgear.md) |
| 7 | [Sider](https://openaitools.app/tool/sider) | 2,644,740 | -10.6% | Freemium | AI sidebar and browser agent for reading, writing and research | [.md](https://openaitools.app/tool/sider.md) |
| 8 | [Immersive Translate](https://openaitools.app/tool/immersive-translate) | 2,392,414 | -9.4% | Freemium, Free Trial | Bilingual AI translation for websites, documents, video and images | [.md](https://openaitools.app/tool/immersive-translate.md) |
| 9 | [LightPDF](https://openaitools.app/tool/lightpdf-com) | 1,742,568 | -15.3% | Freemium | Free AI-powered PDF editor, converter and reader for every device | [.md](https://openaitools.app/tool/lightpdf-com.md) |
| 10 | [ProWritingAid](https://openaitools.app/tool/prowritingaid-com) | 1,623,266 | +17.6% | Freemium, Paid | A comprehensive writing enhancement platform combining deep style analysis with line-level grammar and spelling correction. | [.md](https://openaitools.app/tool/prowritingaid-com.md) |

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Source: https://openaitools.app/compare/languagetool-vs-side-reader

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