⚡ Quick Verdict:
- 価格: ReadSpeaker uses custom pricing (contact sales). NaturalReader starts free, with paid plans from $49/month.
- 最適な用途: ReadSpeaker for 学校, businesses, and accessibility compliance. NaturalReader for personal reading and students on a budget.
- 主な違い： ReadSpeaker embeds text to speech directly into web pages and LMS platforms. NaturalReader works as a standalone app and chrome extension.
- Our pick: ReadSpeaker for most organizations — its accessibility features and WCAG compliance make it the stronger choice.
ReadSpeaker and NaturalReader both turn text into speech.
しかし、それらは全く異なるユーザー層を対象としている。
ReadSpeaker is built for organizations that need accessibility compliance.
NaturalReader is a personal tool for reading documents aloud.
This guide breaks down both tools so you can pick the right one.
概要
This ReadSpeaker vs NaturalReader comparison covers pricing, features, and ease of use.
We also break down who each tool works best for.
Our sources include published specs, documentation, and G2 reviews.
By the end, you’ll know which text to speech tool fits your needs.
ReadSpeakerとは何ですか？
ReadSpeaker is a cloud-based text to speech technology for organizations.
It converts web pages, documents, and app-based text into natural sounding audio.
このプラットフォームは、ディープニューラルネットワークを用いて人間のような音声を生成する。
Schools, businesses, and government agencies use it for digital accessibility and engaging content delivery.
ReadSpeaker’s complete suite of tools covers microsoft word online pages, web pages, and LMS content.
リードスピーカー
ReadSpeaker helps organizations meet WCAG 2.2 and ADA requirements. It supports 50+ languages with 200+ voices. Try it free for 14 days.
ReadSpeakerの料金プラン
ReadSpeakerは独自の料金体系を採用しています。料金の見積もりについては、営業チームにお問い合わせください。
| プラン | 価格 | 最適な用途 |
|---|---|---|
| TextAid Personal | 月額4.90ドル | Individual students and readers |
| Enterprise / Website | カスタム価格設定 | Organizations needing site-wide TTS |
| Education / LMS | カスタム価格設定 | 学校と大学 |
Pricing verified May 2026.
無料トライアル: はい、14日間の無料トライアルをご利用いただけます。クレジットカードは不要です。
返金保証: 返金ポリシーの詳細については、販売担当者にお問い合わせください。
📌 注記： ReadSpeaker TextAid starts at $4.90/month for individuals. Enterprise pricing depends on usage volume, number of users, and which products you need.
⚠️ 警告： Custom pricing makes it hard to compare costs with other tools. Always get quotes from at least three services before you commit.
ReadSpeakerの主な利点
Here’s what makes ReadSpeaker worth considering:
- アクセシビリティ準拠： ReadSpeaker helps organizations meet WCAG 2.2 and ADA requirements. Be aware that this matters for schools and government agencies with legal obligations to comply with data integrity standards.
- ダウンロードは不要です: ReadSpeaker WebReader and docReader work directly in the browser. Users don’t need to install anything to listen to web pages.
- 同期ハイライト表示： Words highlight on screen as they’re spoken aloud. This multimodal approach helps users with learning disabilities follow along.
- 50以上の言語: ReadSpeaker supports over 50 languages with 200+ voices. This covers a wide range of global audiences.
- LMS統合： ReadSpeaker TextAid plugs into learning management systems as an LTI tool. Schools can add it to existing platforms without rebuilding anything.
- Automated Audio Updates: When website or course content changes, audio refreshes automatically. You don’t need to re-record anything.
What Our Team Noticed
私たちの 作家 signed up for ReadSpeaker and spent several days exploring the platform. Here’s what stood out:
ReadSpeakerの長所と短所
✅ メリット
- Meets WCAG 2.2 and ADA accessibility standards
- No software download required for end users
- Integrates with LMS platforms as an LTI tool
- コンテンツが変更されると自動的に音声が更新されます。
❌ デメリット
- 公開価格はありません。見積もりについては営業担当者にお問い合わせください。
- Enterprise focus makes it complex for solo users
- セルフサービス音声クローン機能なし
NaturalReaderとは何ですか?
NaturalReader is an AI text to speech app for personal reading.
It converts PDF files, documents, web pages, and even physical text into audio.
The platform offers over 1,000 AI voices in 100+ languages.
学生、専門家、そして読字障害のある人々が毎日利用しています。
ナチュラルリーダー
NaturalReader turns any text into natural sounding audio. It reads PDF files, Google Docs, and YouTube videos. Start free with no credit card.
NaturalReaderの価格設定
NaturalReader offers a free version and two paid plans. Here’s the breakdown.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| 無料 | 月額0ドル | Casual listening with basic voices |
| シングルプラン | 月額49ドル | 個々のパワーユーザー |
| チームプラン | 月額79ドル | Small teams and collaboration |
Pricing verified May 2026.
無料トライアル: Yes — the free version includes unlimited use of free voices, 20 minutes per day of premium voices, and 5 minutes per day of plus voices.
返金保証: 年間契約者は30日以内、月額契約者は14日以内に返金を請求できます。
📌 注記： Audio files generated with personal use versions are for private listening only. For commercial use, you need the separate NaturalReader Commercial product. Note that personal use versions and messaging systems like email cannot be used to distribute generated audio.
⚠️ 警告： All subscriptions auto-renew at the end of the billing period. Cancelling does not automatically trigger a refund — you must request one separately.
NaturalReaderの主な利点
Here’s what makes NaturalReader worth considering:
- 膨大な音声ライブラリ: NaturalReader provides over 1,000 AI voices across 100+ languages and dialects. The newest and highest technology voices use neural TTS and LLM models for natural sounding audio.
- 幅広いファイルサポート: It reads over 20 file types including PDF, DOCX, EPUB, and TXT. You can also paste text or scan physical books with OCR.
- MP3ダウンロード： You can download audio files in MP3 format for offline listening. This is great for commutes or 旅行.
- Chrome拡張機能: The chrome extension lets you listen to any web page directly. No need to copy and paste text into another app.
- AIテキストフィルタリング： NaturalReader removes unwanted text like URLs, footnotes, and citations before reading. This makes the listening experience much cleaner.
- デバイス間の同期: You can start listening on your desktop and continue on your phone. One account works across all デバイス.
- EDU Plans: NaturalReader EDU offers specialized licensing for schools and universities. Over 2,000 educational institutions already use it.
What Our Team Noticed
Our writer signed up for NaturalReader and spent several days testing the platform. Here’s what stood out:
NaturalReaderの長所と短所
✅ メリット
- Free version available with basic voice access
- Supports 20+ file types including PDF, DOCX, and EPUB
- Chrome extension reads web pages directly
- オフライン再生用のMP3ダウンロード
- AI text filtering removes unwanted text before reading
❌ デメリット
- 無料版では、プレミアム音声の利用時間は1日20分に制限されます。
- Personal use audio cannot be shared publicly
- カスタマーサポートの対応が遅い場合があります
- OCRは低解像度のスキャン画像に苦戦する
機能比較
Let’s compare ReadSpeaker vs NaturalReader across 10 key areas. Each section shows how both tools handle that specific feature.
| 特徴 | リードスピーカー | ナチュラルリーダー |
|---|---|---|
| 開始価格 | Custom (TextAid $4.90/mo) | 月額0ドル（無料プラン） |
| 無料プラン | ❌（14日間無料トライアル） | ✅ |
| AI音声 | 200人以上の声 | 1,000人以上の声 |
| 言語 | 50+ | 100+ |
| テキストのハイライト表示 | ✅ | ❌ |
| Chrome拡張機能 | ❌ (WebReader embed) | ✅ |
| LMS統合 | ✅ | ❌ |
| MP3ダウンロード | ✅ | ✅ |
| WCAG準拠 | ✅ | ❌ |
| 最適な用途 | 組織と学校 | 個人的な読書 |
1. Text to Speech Capabilities
リードスピーカー: ReadSpeaker uses Deep Neural Network technology to produce natural sounding audio. The speech engine processes text through advanced neural TTS that reads content aloud while highlighting words on screen. It handles web pages, online documents, and app-based content directly in the browser.
ナチュラルリーダー: NaturalReader blends neural speech synthesis with large-language-model voices. The result is clear, natural sounding audio across 1,000+ voice options. It converts text from PDF files, Word documents, images, web pages, and even physical books through OCR scanning.
2. Voice Quality and Selection
リードスピーカー: ReadSpeaker offers 200+ voices in 50+ languages. The voices are built with DNN technology and sound human-like. Custom voice creation is available, but it requires working directly with their team — there’s no self-service option.
ナチュラルリーダー: NaturalReader provides over 1,000 AI voices across 100+ languages and dialects. It also includes emotive AI voices and voice cloning features. Users can choose from multiple voice styles and adjust reading speed to their comfort level.
3. Accessibility and Compliance
リードスピーカー: This is where ReadSpeaker shines. It helps organizations meet legal accessibility requirements including WCAG 2.2 and ADA. The tool supports users with visual impairments, learning disabilities, and cognitive barriers through synchronized audio-visual experiences. Research institutions and Microsoft-integrated platforms can launch ReadSpeaker to fill accessibility gaps across their sites.
ナチュラルリーダー: NaturalReader is designed to help people with dyslexia, ADHD, and other reading-based differences. It offers dyslexia-friendly fonts and adjustable speeds. However, it does not provide formal WCAG or ADA compliance tools for organizations.
⚠️ 警告： If your organization needs to comply with accessibility laws, NaturalReader does not include compliance reporting or WCAG 監査 features. ReadSpeaker is the safer pick for legal requirements.
4. Integration and Deployment
リードスピーカー: ReadSpeaker offers tools like WebReader and docReader that embed directly into websites. ReadSpeaker TextAid integrates into learning management systems as an LTI tool. It also provides a Speech Cloud API for developers who want to build text to speech into their own apps.
ナチュラルリーダー: NaturalReader works as a standalone app, chrome extension, and online reader. It doesn’t embed into other websites or systems. You can listen to Google Docs and web pages through the extension, but there’s no API or developer integration.
5. ファイル形式のサポート
リードスピーカー: ReadSpeaker handles web pages, online documents, and content inside learning platforms. ReadSpeaker TextAid lets users listen to personal documents, scanned notes, and highlighted text. However, it’s not designed for bulk file uploads.
ナチュラルリーダー: NaturalReader supports over 20 file types including PDF, TXT, DOCX, EPUB, PPT, HTML, PNG, and more. It also includes an OCR camera scanner that converts physical text into speech. This is a wider range of file format support than what ReadSpeaker offers for personal use.
6. ユーザーエクスペリエンスとインターフェース
リードスピーカー: ReadSpeaker TextAid provides a user friendly interface available in multiple languages. Users can adjust reading speed, voice selection, and text highlighting colors. The web-based design means no downloads are required — it works on any device with a browser.
ナチュラルリーダー: NaturalReader offers a clean interface across its mobile app, chrome extension, and online reader. Users can build a personal library of documents and create personalized settings for voice and speed. The app is available for both iOS そしてAndroid。
7. 教育機能
リードスピーカー: ReadSpeaker TextAid is built specifically as a studying tool for students with learning disabilities. It includes word prediction, dictionary tools, and page masking. Schools can integrate it into their LMS platforms. It supports independent learning so students can access materials on their own.
ナチュラルリーダー: NaturalReader EDU licenses offer specialized usage for schools. Over 2,000 educational institutions use it. Students can have any required reading material text read aloud while following along visually. The tool helps with reading, test-taking, and building autonomy for students with learning disabilities.
8. Offline Listening and Downloads
リードスピーカー: ReadSpeaker allows users to download content as MP3 files for offline listening. However, the core platform is cloud-based and needs an internet connection for real-time text to speech on websites.
ナチュラルリーダー: NaturalReader lets you convert text into MP3 audio files for offline use. The free version requires internet connectivity, but downloaded MP3s work anywhere. Audio files generated are for personal use only unless you have a commercial license.
9. セキュリティとデータのプライバシー
リードスピーカー: ReadSpeaker maintains a strong commitment to data privacy and security. The company has over 20 years of experience and speech-enables 10,000+ applications worldwide. It protects the following information: user data, usage logs, and document content. Government agencies trust its performance and data handling.
ナチュラルリーダー: NaturalReader processes uploaded documents through its servers for OCR and audio generation. G2 reviews note limited information about GDPR or CCPA compliance. The platform stores audio files for up to one year.
10. 価格設定とコスト
料金プランを並べて比較してみましょう。
| プランの種類 | リードスピーカー | ナチュラルリーダー |
|---|---|---|
| 無料 | 14日間無料トライアルのみ | 月額0ドル（音声制限あり） |
| Personal / Starter | TextAid $4.90/month | 月額49ドル（シングルプラン） |
| Team / Group | カスタム価格設定 | 月額79ドル（チームプラン） |
| 企業 | カスタム価格設定 | Custom (EDU Site License) |
リードスピーカー: ReadSpeaker TextAid starts at $4.90/month for individual users. Enterprise and website plans require custom quotes. The 14-day free trial requires no credit card. For schools and large organizations, the value is clear — but solo creators may find it too complex for simple voiceover needs.
ナチュラルリーダー: NaturalReader has a free version with basic voices and limited premium voice time. The Single Plan at $49/month gives full access. Yearly billing averages about $9.92/month and saves money over time. The commercial version is a separate product with its own pricing.
さまざまなシナリオ
| 必要な場合は | 選ぶ | なぜ |
|---|---|---|
| 予算が限られている | ナチュラルリーダー | 無料プランあり |
| WCAG/ADA準拠 | リードスピーカー | Built for legal requirements |
| Personal document reading | ナチュラルリーダー | 20+ file types supported |
| ウェブサイトのアクセシビリティ | リードスピーカー | Embeds directly into sites |
| モバイルリスニング | ナチュラルリーダー | iOSおよびAndroidアプリ |
| LMS統合 | リードスピーカー | LTI tool for schools |
💰 あなたの予算
NaturalReader wins on price with a free version and paid plans starting at $49/month. ReadSpeaker requires a custom quote, so it’s harder to budget in advance.
🔌 あなたの技術スタック
If you need text to speech inside a website or LMS, ReadSpeaker is the only option here. NaturalReader works as a standalone app and chrome extension but doesn’t embed into other systems.
📝 Your Reading Needs
NaturalReader is better for personal document reading across many file types. ReadSpeaker focuses on reading web pages and LMS content aloud with synchronized highlighting.
🎓 あなたの経験レベル
NaturalReader is easier to set up for personal use. ReadSpeaker requires more configuration but delivers stronger results for organizations managing accessibility across multiple pages.
🆓 無料トライアルとデモ
NaturalReader has a permanent free version with basic features. ReadSpeaker offers a 14-day free trial with no credit card required. Both let you test before buying.
🛟 サポートオプション
ReadSpeaker provides 24/7 live support, phone support, and a knowledge base. NaturalReader offers email and help desk support, though response times can vary.
切り替えガイド
既にこれらのツールのいずれかをご利用ですか？切り替える場合、どのような変更が予想されますか？
🔄 ReadSpeakerからNaturalReaderに切り替えますか？
✅ 得られるもの：
- A free version you can use without contacting sales
- 1,000+ AI voices with voice cloning options
- Support for 20+ file types and OCR camera scanning
❌ 失うもの：
- WCAG 2.2およびADA準拠機能
- Direct website and LMS embedding
- Synchronized text highlighting on web pages
📋切り替え方法：
- Download any saved MP3 audio files from ReadSpeaker before cancelling
- naturalreaders.comで無料のNaturalReaderアカウントを作成してください。
- Upload your documents and set up your preferred voices and reading speed
🔄 NaturalReaderからReadSpeakerに切り替えますか？
✅ 得られるもの：
- Full WCAG 2.2 and ADA compliance for your organization
- Direct integration into websites and LMS platforms
- Synchronized text highlighting and page masking tools
❌ 失うもの：
- Free plan access — ReadSpeaker only has a 14-day trial
- Voice cloning and 1,000+ voice selection
- Standalone mobile app for iOS and Android
📋切り替え方法：
- キャンセルする前に、NaturalReaderからMP3オーディオファイルをダウンロードしてください。
- Sign up for a ReadSpeaker 14-day free trial at readspeaker.com
- Contact ReadSpeaker sales for a custom quote based on your organization’s needs
What Our Review Didn’t Cover
This comparison focused on individual and small organization use. We didn’t test enterprise-level deployments with thousands of users or evaluate ReadSpeaker’s custom voice creation process. Our observations on NaturalReader are based on the personal use version — the separate NaturalReader Commercial product was not tested. If you’re managing accessibility for a large government agency or running a content production studio, your experience may differ from what we’ve described here.
最終評決
| カテゴリ | 勝者 |
|---|---|
| 💰価格 | ナチュラルリーダー |
| 🎙️ 音声選択 | ナチュラルリーダー |
| ♿ Accessibility Compliance | リードスピーカー |
| 🔌統合 | リードスピーカー |
| 📄 ファイル形式のサポート | ナチュラルリーダー |
| 🎓 教育関連機能 | リードスピーカー |
| 🔒 セキュリティとプライバシー | リードスピーカー |
| 🏆総合優勝 | リードスピーカー |
🏆 受賞者：ReadSpeaker
ReadSpeakerは7部門中4部門で受賞しました。
最適な用途: Schools needing LMS integration, businesses meeting WCAG requirements, and organizations that need site-wide accessibility.
ReadSpeaker and NaturalReader serve different audiences. ReadSpeaker is built for organizations that need to embed text to speech technology into websites, apps, and learning platforms. NaturalReader is a personal reading tool with a massive voice library and wide file support.
NaturalReader is the better pick if you want a free, easy-to-use app for listening to documents on your phone. It wins on pricing, voice variety, and file format support.
However, if you need accessibility compliance, website embedding, or LMS integration, ReadSpeaker is the stronger choice. It handles the technical and legal side of text to speech that NaturalReader doesn’t touch.
ReadSpeakerの比較
ReadSpeakerが他の競合製品と比べてどうなのか、以下に示します。
ReadSpeaker vs イレブンラボ
ReadSpeakerが優れている点： Accessibility compliance, LMS integration, strict data privacy standards
ElevenLabsが勝利した点： Voice realism and emotional range, voice cloning quality, developer-friendly API
ReadSpeakerとSpeechifyの比較
ReadSpeakerが優れている点： WCAG and ADA compliance tools, website embedding, education-specific features like TextAid
Speechifyが勝利した点： Mobile app experience, celebrity voice options, personal reading speed and interface
ReadSpeaker vs マーフ
ReadSpeakerが優れている点： Web page and LMS text to speech, accessibility standards, synchronized text highlighting
マーフの勝利条件： Studio-quality voiceover for video content, commercial licensing clarity, built-in ビデオエディター
NaturalReaderの比較をもっと見る
NaturalReaderが他の競合製品と比べてどうなのか、以下に示します。
NaturalReaderとSpeechifyの比較
NaturalReaderが優れている点： Number of AI voices available, file format support across 20+ types, free plan with no credit card
Speechifyが勝利した点： Voice naturalness and celebrity voices, mobile app polish, faster customer support
NaturalReaderとElevenLabsの比較
NaturalReaderが優れている点： Personal reading and document listening, free plan availability, wider file type support
ElevenLabsが勝利した点： Voice cloning realism, emotional speech generation, API access for developers
NaturalReader vs Murf AI
NaturalReaderが優れている点： Personal document reading, EDU plans for schools, OCR camera scanning for physical text
Murf AIが勝利した点： Commercial voiceover production, video editing tools, team collaboration features
よくある質問
ReadSpeakerは何をしますか？
ReadSpeaker converts text on web pages, documents, and apps into spoken audio. It highlights words on screen as they’re read aloud. Organizations use it to make their digital content accessible to people with visual impairments and learning disabilities.
NaturalReaderは無料で利用できますか？
Yes. The free version gives you unlimited use of basic voices plus 20 minutes per day of premium voices. You also get 5 minutes per day of the newest plus voices. No credit card is needed to sign up.
ReadSpeakerは無料ですか？
ReadSpeaker is not free, but it offers a 14-day free trial with no credit card required. After the trial, pricing is custom-based. ReadSpeaker TextAid starts at $4.90 per month for individual users.
NaturalReaderの無料版と有料版の違いは何ですか？
The free version limits premium voice time to 20 minutes per day and restricts some features. Paid plans unlock full access to all voices, higher daily limits, and features like the pronunciation editor and advanced tunes.
ReadSpeaker TextAidとは何ですか？
ReadSpeaker TextAid is a web-based reading, writing, and studying tool. It helps students and people with learning disabilities like dyslexia. TextAid includes text highlighting, word prediction, and dictionary features. It works in any browser on any device.
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