📊 当社のテスト結果：
- 🎯 音声品質: Speechify 9/10 vs NaturalReader 7/10 — Speechify wins on superior voice quality
- ⚡ 読書速度範囲： Speechify up to 900 WPM vs NaturalReader’s maximum speed of 900 WPM — Tie on speed control options
- 🔒 OCR精度： Speechify 8/10 vs NaturalReader 7/10 — Speechifyが勝利
- 🌍 言語サポート: Speechify 60+ vs NaturalReader 100+ — NaturalReader excels on multiple languages
- 💰 価格に見合う価値: Speechify 月額11.58ドル vs NaturalReader 月額49ドル — Speechifyが勝利
Choosing the right text to speech software feels overwhelming today.
You want crystal clear voices that mimic natural human speech.
You need a text to speech app that reads PDFs, web pages, and text files out loud.
Speechify and Natural Reader are two of the biggest names in this space.
Both Speechify and Natural Reader convert written text into spoken audio using AI voice generation.
But their voice quality, pricing, and premium features differ a lot.
We tested both apps side by side for three weeks.
This Speechify vs Natural Reader guide covers every feature you need to know.
概要
We spent three weeks testing Speechify and Natural Reader on real reading tasks.
We tested voice quality, reading speed, OCR scanning, and natural reader pricing.
We read dozens of PDFs, ebooks, articles, and web pages with each tool.
We also checked device and software compatibility across iOS, アンドロイド, and desktop.
Here is our honest comparison to help you pick the right text to speech tool.
Speechifyとは何ですか?
Speechify is a text to speech app that converts written content into spoken words using AI.
It converts written text into natural sounding voices that mimic human voices.
It was originally developed as a solution for the founder’s dyslexia.
Today, Speechify is the #1 audio reader in the world with over 60 languages supported.
Speechify helps tens of thousands of people with dyslexia, ADHD, low visual acuity, anxiety, and concussions.
It uses advanced artificial intelligence to convert text into speech and works across multiple devices.
Speechify is available on iOS, Android, and as a Chrome extension.
It helps users multitask by listening to text-to-speech audio while doing other activities.
You can read aloud books, articles, emails, study materials, and even scanned pages.
スピーチファイ
The world’s #1 text to speech app with 200+ lifelike voices in 60+ commonly spoken languages. Listen to any written content at speeds up to 900 words per minute on every device you own.
Speechifyの価格
2026年におけるSpeechifyの料金は以下の通りです。
| プラン | 価格 | 最適な用途 |
|---|---|---|
| 限定 | 月額0ドル | Testing the free version |
| 年間 | 月額11.58ドル | Long-term listeners (billed $139/yr) |
| 毎月 | 月額29ドル | 短期利用または柔軟な利用 |
Pricing verified March 2026.
無料トライアル: Yes, Speechify offers a free trial for 3 days. Credit card required.
返金保証: No clear refund policy posted on the site.
📌 注記： The premium subscription for Speechify costs $139 per year. The premium plan allows users to convert up to 150,000 words per month using premium voices. Speechify does not offer a monthly subscription or a lifetime deal at this annual price point.
⚠️ 警告： Speechify’s pricing varies from country to country. The free trial auto-charges after 3 days, and many users report being billed the full annual fee. Cancel before the trial ends.
Speechifyの主なメリット
Here is why Speechify stands out as a valuable tool:
- まるで生きているかのような声： Over 1,000 voices and 200+ premium AI voices in 60+ languages. Includes both male and female voices that sound nearly like human speech.
- クロスプラットフォーム同期： Start on your phone and pick up on your laptop. Speechify works on iOS, Android, Chrome extension, マック, and Edge across multiple devices.
- OCR Scan and Listen: Speechify utilizes optical character recognition (OCR) technology to read printed text and images, even handwritten notes.
- 速度制御: Users can control the speed of narration up to 900 words per minute. The high reading speed helps users who prefer faster reading speeds.
- テキストの強調表示: Real-time text highlighting synchronized with the audio. This feature helps enhance comprehension and retention substantially.
- 多言語サポート: Supports over 60 commonly spoken languages with lifelike AI voices. Translation features make it a versatile tool for language learners.
- オフライン再生： Speechify allows users to listen to content offline, enhancing its usability for users on the go.
Speechifyの長所と短所
✅ メリット
- Superior voice quality with 200+ premium AI voices
- Works on multiple devices and browsers
- OCR scans printed text, web pages, and handwritten notes
- Text highlighting helps users follow along easily
- AI Voice Studio for content creators included
❌ デメリット
- $139/year is expensive compared to alternatives like MicMonster
- Free trial auto-charges after 3 days without clear warning
- Voices may lack the emotional nuance of human narration
Natural Readerとは何ですか?
Natural Reader is a text to speech software that converts written content into spoken audio.
It has been around for over 15 years and serves over 1 million monthly users.
Natural Reader offers over 1000 AI-powered voices in more than 100 languages and dialects.
It supports over 20 file types including PDF, TXT, DOCX, and EPUB.
Natural Reader stands out for accessibility, with use in over 2,000 (2000+) educational institutions.
It is available as a mobile app for iOS and Android, plus a Chrome extension.
ナチュラルリーダー
A trusted text to speech tool with 15+ years of experience. Offers 1000+ high quality AI voices in 100+ different languages plus support for 20+ text files and document formats.
ナチュラルリーダーの価格
Here is what Natural Reader costs in 2026.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| 無料 | 月額0ドル | 基本的なリスニング（制限あり） |
| シングルプラン | 月額49ドル | Individual commercial users |
| チームプラン | 月額79ドル | 小規模チームと企業 |
Pricing verified March 2026.
無料トライアル: Yes, the free version offers 20 minutes per day of premium voices and 5 minutes per day of plus voices.
返金保証: 年間プランは30日間、月額プランは14日間です。
📌 注記： Natural Reader has separate personal and commercial plans. The Personal Version of Natural Reader is strictly for individual listening. The Commercial AI Voice Generator provides licensing for creators and content makers.
⚠️ 警告： All subscriptions auto-renew at the end of the billing period. Canceling a subscription does not automatically initiate a refund. You must request one separately.
Key Benefits of Natural Reader
Here is why Natural Reader stands out among text to speech tools:
- 幅広いファイルサポート: Natural Reader supports over 20 file types including PDF, DOCX, EPUB, and TXT. This text to speech tool handles more text files than most rivals.
- 大規模言語ライブラリ： Over 1000 AI voices in 100+ languages and dialects. The widest multilingual support among text to speech apps tested.
- AIテキストフィルタリング： Removes distracting text such as URLs, footnotes, and citations. Keeps the listening experience clean for written content.
- MP3ダウンロード： Save converted audio as MP3 files. Listen to your spoken audio offline without an internet connection.
- 発音エディター： Customize how the AI pronounces specific words. Great for technical terms, brand names, and rare vocabulary.
- 教育計画 学校: Special licenses for over 2,000 educational institutions. Helps students with reading-related learning disabilities and visual impairments.
- クロスプラットフォームでの利用： Web, mobile, and Chrome extension. Continue listening seamlessly across multiple devices with one account.
Natural Reader Pros & Cons
✅ Natural Reader Pros
- Supports 20+ text files and document formats
- 1000+ AI voices in 100+ different languages
- AIによるテキストフィルタリングで、邪魔なコンテンツを削除
- オフライン再生用のMP3ダウンロード
- Pronunciation editor for custom word pronunciation
❌ デメリット
- 個人利用の場合、月額49ドルは高額です。
- Free version requires an internet connection
- Voice quality lags behind Speechify’s premium voices
機能比較
Ready for a detailed natural reader features comparison against Speechify?
The natural reader speechify debate comes down to natural voices, pricing, and features.
各カテゴリーの勝者を決定するために、10の主要分野をテストしました。
Each section shows how the two text to speech apps handle that specific feature.
| 特徴 | スピーチファイ | ナチュラルリーダー |
|---|---|---|
| 開始価格 | 月額11.58ドル | 月額49ドル |
| 無料版 | ✅ | ✅ |
| AI音声品質 | ⭐ Superior | ⭐ 良い |
| 音声クローン | ✅ | ✅ |
| OCRスキャン | ✅ | ✅ |
| MP3ダウンロード | ❌ | ✅ |
| AIテキストフィルタリング | ❌ | ✅ |
| 発音エディター | ❌ | ✅ |
| 言語 | 60+ | 100+ |
| Instant Translation | ✅ | ❌ |
| 最適な用途 | パーソナルリスニング | ファイル量の多い読者 |
1. AI音声品質
スピーチファイ： Speechify offers over 200 premium voices and uses advanced neural TTS technology to generate speech from text. The voices include both male and female voices that sound nearly like natural human speech. Celebrity ai voice actors like Snoop Dogg add a fun twist for content creators.
Natural Reader: Natural Reader blends neural speech synthesis and large-language-model voices for natural sounding speech. It offers 1000+ ai voices, but reviewers note some premium voices still sound slightly robotic compared to Speechify’s lifelike voices.
2. AI Voice Generation and Cloning
スピーチファイ： Voice generation Speechify offers includes a full AI Voice Studio. Upload a short audio sample and the AI creates a custom voice model. You can then turn any written text into spoken words in your own voice.
Natural Reader: Natural Reader offers voice cloning through its commercial AI voice generator platform. The ai voice generation works well for content creators. Personal users may need to upgrade to access this advanced feature.
3. OCRと文書スキャン
スピーチファイ： Point your phone camera at any printed page. Speechify can read text from various formats, including PDFs and images, using optical character recognition. It can convert physical books into audiobooks by scanning pages with a mobile device. These speech features expand the user’s ability to consume written content from any source.
Natural Reader: Natural Reader converts any text, PDF, image, web page, and physical book into natural-sounding audio. Its OCR camera scanner reads printed text from images. It struggles with low-resolution scans and complex page layouts.
⚠️ 警告： Both apps need good lighting and flat pages for accurate OCR. Curved book spines can cause text recognition errors on both platforms.
4. Reading Speed Control
スピーチファイ： Speed control Speechify offers goes up to 900 words per minute. Speechify enhances the reading experience by allowing users to listen to text at speeds up to 900 words per minute. This is great for users who prefer faster reading speeds.
Natural Reader: Natural reader’s maximum speed also reaches 900 words per minute. Natural Reader can increase reading speed up to 900 words per minute. Both tools tie here, making speed control winner a draw.
5. Languages and Translation
スピーチファイ： Speechify supports over 60 commonly spoken languages with lifelike AI voices. It also includes translation features for users who read content in different languages. The instant translation function helps language learners enhance comprehension.
Natural Reader: Natural Reader excels with 100+ languages and dialects covered by 1000+ high quality ai voices. This is nearly double what Speechify offers. If you need many commonly spoken languages plus rare dialects, Natural Reader wins.
6. ファイル形式のサポート
スピーチファイ： Speechify reads PDFs, web pages, Google Docs, emails, and images. You can import via copy-paste, file uploads, web links, or scanning physical pages. It covers the most common written content formats.
Natural Reader: Natural Reader supports over 20 file types including PDF, DOCX, EPUB, TXT, PPT, HTML, and images. This is one of the widest text files selections in any text to speech app.
7. AI Dubbing and Advanced Features
スピーチファイ： Speechify Studio includes AI dubbing for videos. It translates and dubs video content in multiple languages while keeping the speaker’s original voice tone. This is one of its more advanced features for creators.
Natural Reader: Natural Reader focuses on text to speech capabilities rather than video dubbing. It does not offer AI dubbing for video content. For video dubbing, Speechify Studio is the clear winner.
8. Text Filtering and Pronunciation
スピーチファイ： Speechify reads everything on the page as-is. There is no built-in filter to skip URLs, footnotes, or sidebar content. There is no pronunciation editor either. This can make some readings messy.
Natural Reader: Natural Reader has AI text filtering that removes URLs, citations, and footnotes from audio. It also includes a pronunciation editor for custom words. Both features keep the listening experience clean for sensitive readers.
9. Offline Listening and Audio Export
スピーチファイ： Speechify allows users to listen to content offline without an internet connection on premium plans. However, it does not let you export the spoken audio as MP3 files for sharing or backup.
Natural Reader: Natural Reader allows users to download audio as MP3 files. You can save them to any device and listen anytime offline. The free version still requires an internet connection during use.
10. 価格設定とコスト
Let’s compare the natural reader pricing and Speechify pricing side by side.
| プラン | スピーチファイ | ナチュラルリーダー |
|---|---|---|
| 無料 | 0ドル（数量限定） | 0ドル（プレミアム音声通話20分/日） |
| 支払い（月払い） | 月額29ドル | 月額49ドル |
| 有料（年払い） | 月額11.58ドル | ~$9.92/month |
| Team / Commercial | エンタープライズ（カスタム） | 月額79ドル |
スピーチファイ： The annual plan works out to $11.58/month billed yearly. The monthly plan costs $29/month. Speechify is the more affordable choice for most users who want premium features and crystal clear voices.
Natural Reader: The Single Plan costs $49/month. The yearly Plus plan averages around $9.92/month. Natural Reader is slightly cheaper annually but much more expensive on the monthly billing cycle.
💡 テスト結果： We tested both apps reading the same 5,000-word PDF article. Speechify finished with clearer pronunciation. Natural Reader handled the formatting better but sounded slightly flat.
さまざまなシナリオ
| 必要な場合は | 選ぶ | なぜ |
|---|---|---|
| Superior voice quality | スピーチファイ | 200+ lifelike voices that mimic human voices |
| 多言語サポート | ナチュラルリーダー | 100+ different languages and dialects |
| 最低月額料金 | スピーチファイ | 月額29ドル対月額49ドル |
| MP3ダウンロード | ナチュラルリーダー | MP3エクスポート機能を内蔵 |
| Translation features | スピーチファイ | Instant translation included |
| Accessibility for visual impairments | スピーチファイ | 失読症とADHD向けに設計されています |
💰 あなたの予算
Speechify costs $29/month or $139/year. Natural Reader costs $49/month or $119/year. If you pay monthly, Speechify saves you $20 each month on premium voices and more features.
🔌 あなたの技術スタック
Device and software compatibility matters. Speechify works on iOS, Android, Chrome, Edge, Mac, and the web. Natural Reader covers web, mobile, and Chrome. Speechify has broader multiple devices support.
📝 あなたの読書スタイル
If you read lots of text files in different formats, Natural Reader handles 20+ file types. If you mainly read web pages and emails, Speechify is faster to set up and use.
🎓 あなたの経験レベル
Both apps are beginner-friendly productivity tools. Speechify has a cleaner mobile interface. Natural Reader works great for students who need EDU group pricing and accessibility features. Speechify also adds more productivity tools through Studio for content creators.
🆓 無料トライアルとデモ
Speechify offers a 3-day free trial of premium features. Natural Reader gives you 20 minutes of premium voices daily on its free version. Test both before paying.
🛟 サポートオプション
Speechify has strong app store support and an online help center. Natural Reader offers email support and a help center. Neither tool offers live chat support today.
切り替えガイド
Already using one of these text to speech apps? Here is what to expect if you switch.
🔄 Switching from Speechify to Natural Reader?
✅ 得られるもの：
- オフラインオーディオファイルのMP3ダウンロード
- AI text filtering that removes URLs and footnotes
- 100+ languages instead of 60+ languages
- Pronunciation editor for custom word reading
❌ 失うもの：
- Premium celebrity ai voice actors like Snoop Dogg
- AIビデオ dubbing through Speechify Studio
- iOSでのモバイルアプリ体験の向上
📋切り替え方法：
- Speechifyのサブスクリプションは更新前にキャンセルしてください。
- Create a free Natural Reader account at naturalreaders.com
- Upload your documents and pick a paid plan if needed
🔄 Switching from Natural Reader to Speechify?
✅ 得られるもの：
- Superior voice quality with 200+ premium voices
- 多言語対応の動画向けAI吹き替え
- 月額料金は49ドルに対し29ドルと低価格です。
- Instant translation features built in
❌ 失うもの：
- MP3のダウンロードとエクスポート機能
- クリーンな音声を実現するAIテキストフィルタリング
- カスタム単語の発音エディター
📋切り替え方法：
- Cancel your Natural Reader plan and request a refund if eligible
- App Storeまたはspeechify.comからSpeechifyをダウンロードしてください。
- 3日間の無料トライアルを開始して、読書資料をインポートしましょう。
最終評決
| カテゴリ | 勝者 |
|---|---|
| 💰価格 | スピーチファイ |
| 🎙️ 音声品質 | スピーチファイ |
| ⚡ スピードコントロール | ネクタイ |
| 🌍 言語サポート | ナチュラルリーダー |
| 📁 ファイル形式のサポート | ナチュラルリーダー |
| 👶 使いやすさ | スピーチファイ |
| 🔌 プラットフォームサポート | スピーチファイ |
| 🏆総合優勝 | スピーチファイ |
🏆 受賞者：Speechify
Speechifyは7部門中4部門で受賞した。
最適な用途: Students with dyslexia, busy professionals, language learners, and anyone who wants the best superior voice quality in a text to speech app.
Speechify and Natural Reader serve different types of users.
Speechify stands out for voice quality and a polished mobile experience.
It was built from day one for people with reading disabilities and visual impairments.
Millions rely on Speechify daily as their main productivity tool.
Natural Reader excels at multilingual support and file format coverage.
It works best for students and professionals who read in different languages.
2,000以上の教育機関が、授業での利用に信頼を寄せている。
Natural Reader is a great pick if you need 100+ languages or MP3 exports.
However, for most users, Speechify is the better text to speech app overall.
月額料金が安く、音質もより自然で、対応デバイスも増えています。
Speechifyの比較
Speechifyが他のテキスト読み上げツールと比べてどうなのか、以下に比較してみましょう。
Speechify vs マーフ 人工知能
Speechifyが勝利した点： Mobile experience, reading speed, accessibility
Murf AIが勝利した点： スタジオ品質のナレーション、商用ライセンス
Speechify vs Play.ht
Speechifyが勝利した点： クロスプラットフォーム同期、OCRスキャン、ユーザーベース
Play.htが勝利した点： APIアクセス、ポッドキャストホスティング、音声カスタマイズ
More of Natural Reader Compared
Here’s how Natural Reader stacks up against other text to speech apps:
Natural Reader vs Murf AI
Natural Reader wins on: File format support, free version, EDU plans
Murf AIが勝利した点： 音声リアリズム、商用ライセンス、スタジオツール
Natural Reader vs ElevenLabs
Natural Reader wins on: File format support, MP3 export, education plans
ElevenLabsが勝利した点： 音声のリアリズム、API、音声クローン品質
Natural Reader vs Descript
Natural Reader wins on: テキスト読み取り、言語数、ファイルサポート
説明文が勝つ点： 動画編集、文字起こし、ポッドキャストツール
Natural Reader vs Play.ht
Natural Reader wins on: 個人的な読書、OCR、言語カウント
Play.htが勝利した点： ポッドキャストホスティング、APIアクセス、音声カスタマイズ
Natural Reader vs Lovo
Natural Reader wins on: ファイルサポート、テキストフィルタリング、無料版
Lovoが勝利した点： ビデオ制作、声優、 コンテンツスタジオ
よくある質問
Is Natural Reader better than Speechify?
Natural Reader wins on languages and file format support. Speechify wins on voice quality, pricing, and mobile experience. Most users prefer Speechify.
Speechifyのデメリットは何ですか？
Speechify costs $139/year, which is steep. The free trial auto-charges after 3 days. Speeds above 500 WPM are hard to follow.
What are the cons of Natural Reader?
Natural Reader’s $49/month price is high for personal use. Voice quality trails Speechify. The free version limits premium voices to 20 minutes daily.
Speechifyは最高の読み上げアプリですか？
Speechify is the #1 rated text to speech app for personal reading. It offers superior voice quality and works on multiple devices. Hard to beat overall.
Is Natural Reader completely free?
Natural Reader has a free version with basic voices. You get 20 minutes per day of premium voices. Full access starts at $49/month or $119/year.
English 
Spanish 
Chinese 
German 
French 
Arabic 
Russian 
Portuguese 
Japanese 
Korean 
Italian 
Turkish 
Dutch 
Polish 
Indonesian 
Thai 
Vietnamese 